feat: add MCP support (#20716)

Co-authored-by: QuantumGhost <obelisk.reg+git@gmail.com>

api/controllers/console/__init__.py

@@ -56,6 +56,7 @@ from .app import (
     conversation,
     conversation_variables,
     generator,
+    mcp_server,
     message,
     model_config,
     ops_trace,

api/controllers/console/app/mcp_server.py

@@ -0,0 +1,102 @@
+import json
+from enum import StrEnum
+
+from flask_login import current_user
+from flask_restful import Resource, marshal_with, reqparse
+from werkzeug.exceptions import NotFound
+
+from controllers.console import api
+from controllers.console.app.wraps import get_app_model
+from controllers.console.wraps import account_initialization_required, setup_required
+from extensions.ext_database import db
+from fields.app_fields import app_server_fields
+from libs.login import login_required
+from models.model import AppMCPServer
+
+
+class AppMCPServerStatus(StrEnum):
+    ACTIVE = "active"
+    INACTIVE = "inactive"
+
+
+class AppMCPServerController(Resource):
+    @setup_required
+    @login_required
+    @account_initialization_required
+    @get_app_model
+    @marshal_with(app_server_fields)
+    def get(self, app_model):
+        server = db.session.query(AppMCPServer).filter(AppMCPServer.app_id == app_model.id).first()
+        return server
+
+    @setup_required
+    @login_required
+    @account_initialization_required
+    @get_app_model
+    @marshal_with(app_server_fields)
+    def post(self, app_model):
+        # The role of the current user in the ta table must be editor, admin, or owner
+        if not current_user.is_editor:
+            raise NotFound()
+        parser = reqparse.RequestParser()
+        parser.add_argument("description", type=str, required=True, location="json")
+        parser.add_argument("parameters", type=dict, required=True, location="json")
+        args = parser.parse_args()
+        server = AppMCPServer(
+            name=app_model.name,
+            description=args["description"],
+            parameters=json.dumps(args["parameters"], ensure_ascii=False),
+            status=AppMCPServerStatus.ACTIVE,
+            app_id=app_model.id,
+            tenant_id=current_user.current_tenant_id,
+            server_code=AppMCPServer.generate_server_code(16),
+        )
+        db.session.add(server)
+        db.session.commit()
+        return server
+
+    @setup_required
+    @login_required
+    @account_initialization_required
+    @get_app_model
+    @marshal_with(app_server_fields)
+    def put(self, app_model):
+        if not current_user.is_editor:
+            raise NotFound()
+        parser = reqparse.RequestParser()
+        parser.add_argument("id", type=str, required=True, location="json")
+        parser.add_argument("description", type=str, required=True, location="json")
+        parser.add_argument("parameters", type=dict, required=True, location="json")
+        parser.add_argument("status", type=str, required=False, location="json")
+        args = parser.parse_args()
+        server = db.session.query(AppMCPServer).filter(AppMCPServer.id == args["id"]).first()
+        if not server:
+            raise NotFound()
+        server.description = args["description"]
+        server.parameters = json.dumps(args["parameters"], ensure_ascii=False)
+        if args["status"]:
+            if args["status"] not in [status.value for status in AppMCPServerStatus]:
+                raise ValueError("Invalid status")
+            server.status = args["status"]
+        db.session.commit()
+        return server
+
+
+class AppMCPServerRefreshController(Resource):
+    @setup_required
+    @login_required
+    @account_initialization_required
+    @marshal_with(app_server_fields)
+    def get(self, server_id):
+        if not current_user.is_editor:
+            raise NotFound()
+        server = db.session.query(AppMCPServer).filter(AppMCPServer.id == server_id).first()
+        if not server:
+            raise NotFound()
+        server.server_code = AppMCPServer.generate_server_code(16)
+        db.session.commit()
+        return server
+
+
+api.add_resource(AppMCPServerController, "/apps/<uuid:app_id>/server")
+api.add_resource(AppMCPServerRefreshController, "/apps/<uuid:server_id>/server/refresh")

api/controllers/console/workspace/tool_providers.py

@@ -1,6 +1,7 @@
 import io
+from urllib.parse import urlparse
 
-from flask import send_file
+from flask import redirect, send_file
 from flask_login import current_user
 from flask_restful import Resource, reqparse
 from sqlalchemy.orm import Session
@@ -9,17 +10,34 @@ from werkzeug.exceptions import Forbidden
 from configs import dify_config
 from controllers.console import api
 from controllers.console.wraps import account_initialization_required, enterprise_license_required, setup_required
+from core.mcp.auth.auth_flow import auth, handle_callback
+from core.mcp.auth.auth_provider import OAuthClientProvider
+from core.mcp.error import MCPAuthError, MCPError
+from core.mcp.mcp_client import MCPClient
 from core.model_runtime.utils.encoders import jsonable_encoder
 from extensions.ext_database import db
 from libs.helper import alphanumeric, uuid_value
 from libs.login import login_required
 from services.tools.api_tools_manage_service import ApiToolManageService
 from services.tools.builtin_tools_manage_service import BuiltinToolManageService
+from services.tools.mcp_tools_mange_service import MCPToolManageService
 from services.tools.tool_labels_service import ToolLabelsService
 from services.tools.tools_manage_service import ToolCommonService
+from services.tools.tools_transform_service import ToolTransformService
 from services.tools.workflow_tools_manage_service import WorkflowToolManageService
 
 
+def is_valid_url(url: str) -> bool:
+    if not url:
+        return False
+
+    try:
+        parsed = urlparse(url)
+        return all([parsed.scheme, parsed.netloc]) and parsed.scheme in ["http", "https"]
+    except Exception:
+        return False
+
+
 class ToolProviderListApi(Resource):
     @setup_required
     @login_required
@@ -34,7 +52,7 @@ class ToolProviderListApi(Resource):
         req.add_argument(
             "type",
             type=str,
-            choices=["builtin", "model", "api", "workflow"],
+            choices=["builtin", "model", "api", "workflow", "mcp"],
             required=False,
             nullable=True,
             location="args",
@@ -613,6 +631,166 @@ class ToolLabelsApi(Resource):
         return jsonable_encoder(ToolLabelsService.list_tool_labels())
 
 
+class ToolProviderMCPApi(Resource):
+    @setup_required
+    @login_required
+    @account_initialization_required
+    def post(self):
+        parser = reqparse.RequestParser()
+        parser.add_argument("server_url", type=str, required=True, nullable=False, location="json")
+        parser.add_argument("name", type=str, required=True, nullable=False, location="json")
+        parser.add_argument("icon", type=str, required=True, nullable=False, location="json")
+        parser.add_argument("icon_type", type=str, required=True, nullable=False, location="json")
+        parser.add_argument("icon_background", type=str, required=False, nullable=True, location="json", default="")
+        parser.add_argument("server_identifier", type=str, required=True, nullable=False, location="json")
+        args = parser.parse_args()
+        user = current_user
+        if not is_valid_url(args["server_url"]):
+            raise ValueError("Server URL is not valid.")
+        return jsonable_encoder(
+            MCPToolManageService.create_mcp_provider(
+                tenant_id=user.current_tenant_id,
+                server_url=args["server_url"],
+                name=args["name"],
+                icon=args["icon"],
+                icon_type=args["icon_type"],
+                icon_background=args["icon_background"],
+                user_id=user.id,
+                server_identifier=args["server_identifier"],
+            )
+        )
+
+    @setup_required
+    @login_required
+    @account_initialization_required
+    def put(self):
+        parser = reqparse.RequestParser()
+        parser.add_argument("server_url", type=str, required=True, nullable=False, location="json")
+        parser.add_argument("name", type=str, required=True, nullable=False, location="json")
+        parser.add_argument("icon", type=str, required=True, nullable=False, location="json")
+        parser.add_argument("icon_type", type=str, required=True, nullable=False, location="json")
+        parser.add_argument("icon_background", type=str, required=False, nullable=True, location="json")
+        parser.add_argument("provider_id", type=str, required=True, nullable=False, location="json")
+        parser.add_argument("server_identifier", type=str, required=True, nullable=False, location="json")
+        args = parser.parse_args()
+        if not is_valid_url(args["server_url"]):
+            if "[__HIDDEN__]" in args["server_url"]:
+                pass
+            else:
+                raise ValueError("Server URL is not valid.")
+        MCPToolManageService.update_mcp_provider(
+            tenant_id=current_user.current_tenant_id,
+            provider_id=args["provider_id"],
+            server_url=args["server_url"],
+            name=args["name"],
+            icon=args["icon"],
+            icon_type=args["icon_type"],
+            icon_background=args["icon_background"],
+            server_identifier=args["server_identifier"],
+        )
+        return {"result": "success"}
+
+    @setup_required
+    @login_required
+    @account_initialization_required
+    def delete(self):
+        parser = reqparse.RequestParser()
+        parser.add_argument("provider_id", type=str, required=True, nullable=False, location="json")
+        args = parser.parse_args()
+        MCPToolManageService.delete_mcp_tool(tenant_id=current_user.current_tenant_id, provider_id=args["provider_id"])
+        return {"result": "success"}
+
+
+class ToolMCPAuthApi(Resource):
+    @setup_required
+    @login_required
+    @account_initialization_required
+    def post(self):
+        parser = reqparse.RequestParser()
+        parser.add_argument("provider_id", type=str, required=True, nullable=False, location="json")
+        parser.add_argument("authorization_code", type=str, required=False, nullable=True, location="json")
+        args = parser.parse_args()
+        provider_id = args["provider_id"]
+        tenant_id = current_user.current_tenant_id
+        provider = MCPToolManageService.get_mcp_provider_by_provider_id(provider_id, tenant_id)
+        if not provider:
+            raise ValueError("provider not found")
+        try:
+            with MCPClient(
+                provider.decrypted_server_url,
+                provider_id,
+                tenant_id,
+                authed=False,
+                authorization_code=args["authorization_code"],
+                for_list=True,
+            ):
+                MCPToolManageService.update_mcp_provider_credentials(
+                    mcp_provider=provider,
+                    credentials=provider.decrypted_credentials,
+                    authed=True,
+                )
+                return {"result": "success"}
+
+        except MCPAuthError:
+            auth_provider = OAuthClientProvider(provider_id, tenant_id, for_list=True)
+            return auth(auth_provider, provider.decrypted_server_url, args["authorization_code"])
+        except MCPError as e:
+            MCPToolManageService.update_mcp_provider_credentials(
+                mcp_provider=provider,
+                credentials={},
+                authed=False,
+            )
+            raise ValueError(f"Failed to connect to MCP server: {e}") from e
+
+
+class ToolMCPDetailApi(Resource):
+    @setup_required
+    @login_required
+    @account_initialization_required
+    def get(self, provider_id):
+        user = current_user
+        provider = MCPToolManageService.get_mcp_provider_by_provider_id(provider_id, user.current_tenant_id)
+        return jsonable_encoder(ToolTransformService.mcp_provider_to_user_provider(provider, for_list=True))
+
+
+class ToolMCPListAllApi(Resource):
+    @setup_required
+    @login_required
+    @account_initialization_required
+    def get(self):
+        user = current_user
+        tenant_id = user.current_tenant_id
+
+        tools = MCPToolManageService.retrieve_mcp_tools(tenant_id=tenant_id)
+
+        return [tool.to_dict() for tool in tools]
+
+
+class ToolMCPUpdateApi(Resource):
+    @setup_required
+    @login_required
+    @account_initialization_required
+    def get(self, provider_id):
+        tenant_id = current_user.current_tenant_id
+        tools = MCPToolManageService.list_mcp_tool_from_remote_server(
+            tenant_id=tenant_id,
+            provider_id=provider_id,
+        )
+        return jsonable_encoder(tools)
+
+
+class ToolMCPCallbackApi(Resource):
+    def get(self):
+        parser = reqparse.RequestParser()
+        parser.add_argument("code", type=str, required=True, nullable=False, location="args")
+        parser.add_argument("state", type=str, required=True, nullable=False, location="args")
+        args = parser.parse_args()
+        state_key = args["state"]
+        authorization_code = args["code"]
+        handle_callback(state_key, authorization_code)
+        return redirect(f"{dify_config.CONSOLE_WEB_URL}/oauth-callback")
+
+
 # tool provider
 api.add_resource(ToolProviderListApi, "/workspaces/current/tool-providers")
 
@@ -647,8 +825,15 @@ api.add_resource(ToolWorkflowProviderDeleteApi, "/workspaces/current/tool-provid
 api.add_resource(ToolWorkflowProviderGetApi, "/workspaces/current/tool-provider/workflow/get")
 api.add_resource(ToolWorkflowProviderListToolApi, "/workspaces/current/tool-provider/workflow/tools")
 
+# mcp tool provider
+api.add_resource(ToolMCPDetailApi, "/workspaces/current/tool-provider/mcp/tools/<path:provider_id>")
+api.add_resource(ToolProviderMCPApi, "/workspaces/current/tool-provider/mcp")
+api.add_resource(ToolMCPUpdateApi, "/workspaces/current/tool-provider/mcp/update/<path:provider_id>")
+api.add_resource(ToolMCPAuthApi, "/workspaces/current/tool-provider/mcp/auth")
+api.add_resource(ToolMCPCallbackApi, "/mcp/oauth/callback")
+
 api.add_resource(ToolBuiltinListApi, "/workspaces/current/tools/builtin")
 api.add_resource(ToolApiListApi, "/workspaces/current/tools/api")
+api.add_resource(ToolMCPListAllApi, "/workspaces/current/tools/mcp")
 api.add_resource(ToolWorkflowListApi, "/workspaces/current/tools/workflow")
-
 api.add_resource(ToolLabelsApi, "/workspaces/current/tool-labels")

api/controllers/mcp/__init__.py

@@ -0,0 +1,8 @@
+from flask import Blueprint
+
+from libs.external_api import ExternalApi
+
+bp = Blueprint("mcp", __name__, url_prefix="/mcp")
+api = ExternalApi(bp)
+
+from . import mcp

api/controllers/mcp/mcp.py

@@ -0,0 +1,104 @@
+from flask_restful import Resource, reqparse
+from pydantic import ValidationError
+
+from controllers.console.app.mcp_server import AppMCPServerStatus
+from controllers.mcp import api
+from core.app.app_config.entities import VariableEntity
+from core.mcp import types
+from core.mcp.server.streamable_http import MCPServerStreamableHTTPRequestHandler
+from core.mcp.types import ClientNotification, ClientRequest
+from core.mcp.utils import create_mcp_error_response
+from extensions.ext_database import db
+from libs import helper
+from models.model import App, AppMCPServer, AppMode
+
+
+class MCPAppApi(Resource):
+    def post(self, server_code):
+        def int_or_str(value):
+            if isinstance(value, (int, str)):
+                return value
+            else:
+                return None
+
+        parser = reqparse.RequestParser()
+        parser.add_argument("jsonrpc", type=str, required=True, location="json")
+        parser.add_argument("method", type=str, required=True, location="json")
+        parser.add_argument("params", type=dict, required=False, location="json")
+        parser.add_argument("id", type=int_or_str, required=False, location="json")
+        args = parser.parse_args()
+
+        request_id = args.get("id")
+
+        server = db.session.query(AppMCPServer).filter(AppMCPServer.server_code == server_code).first()
+        if not server:
+            return helper.compact_generate_response(
+                create_mcp_error_response(request_id, types.INVALID_REQUEST, "Server Not Found")
+            )
+
+        if server.status != AppMCPServerStatus.ACTIVE:
+            return helper.compact_generate_response(
+                create_mcp_error_response(request_id, types.INVALID_REQUEST, "Server is not active")
+            )
+
+        app = db.session.query(App).filter(App.id == server.app_id).first()
+        if not app:
+            return helper.compact_generate_response(
+                create_mcp_error_response(request_id, types.INVALID_REQUEST, "App Not Found")
+            )
+
+        if app.mode in {AppMode.ADVANCED_CHAT.value, AppMode.WORKFLOW.value}:
+            workflow = app.workflow
+            if workflow is None:
+                return helper.compact_generate_response(
+                    create_mcp_error_response(request_id, types.INVALID_REQUEST, "App is unavailable")
+                )
+
+            user_input_form = workflow.user_input_form(to_old_structure=True)
+        else:
+            app_model_config = app.app_model_config
+            if app_model_config is None:
+                return helper.compact_generate_response(
+                    create_mcp_error_response(request_id, types.INVALID_REQUEST, "App is unavailable")
+                )
+
+            features_dict = app_model_config.to_dict()
+            user_input_form = features_dict.get("user_input_form", [])
+        converted_user_input_form: list[VariableEntity] = []
+        try:
+            for item in user_input_form:
+                variable_type = item.get("type", "") or list(item.keys())[0]
+                variable = item[variable_type]
+                converted_user_input_form.append(
+                    VariableEntity(
+                        type=variable_type,
+                        variable=variable.get("variable"),
+                        description=variable.get("description") or "",
+                        label=variable.get("label"),
+                        required=variable.get("required", False),
+                        max_length=variable.get("max_length"),
+                        options=variable.get("options") or [],
+                    )
+                )
+        except ValidationError as e:
+            return helper.compact_generate_response(
+                create_mcp_error_response(request_id, types.INVALID_PARAMS, f"Invalid user_input_form: {str(e)}")
+            )
+
+        try:
+            request: ClientRequest | ClientNotification = ClientRequest.model_validate(args)
+        except ValidationError as e:
+            try:
+                notification = ClientNotification.model_validate(args)
+                request = notification
+            except ValidationError as e:
+                return helper.compact_generate_response(
+                    create_mcp_error_response(request_id, types.INVALID_PARAMS, f"Invalid MCP request: {str(e)}")
+                )
+
+        mcp_server_handler = MCPServerStreamableHTTPRequestHandler(app, request, converted_user_input_form)
+        response = mcp_server_handler.handle()
+        return helper.compact_generate_response(response)
+
+
+api.add_resource(MCPAppApi, "/server/<string:server_code>/mcp")

api/core/agent/base_agent_runner.py

@@ -161,10 +161,14 @@ class BaseAgentRunner(AppRunner):
             if parameter.type == ToolParameter.ToolParameterType.SELECT:
                 enum = [option.value for option in parameter.options] if parameter.options else []
 
-            message_tool.parameters["properties"][parameter.name] = {
-                "type": parameter_type,
-                "description": parameter.llm_description or "",
-            }
+            message_tool.parameters["properties"][parameter.name] = (
+                {
+                    "type": parameter_type,
+                    "description": parameter.llm_description or "",
+                }
+                if parameter.input_schema is None
+                else parameter.input_schema
+            )
 
             if len(enum) > 0:
                 message_tool.parameters["properties"][parameter.name]["enum"] = enum
@@ -254,10 +258,14 @@ class BaseAgentRunner(AppRunner):
             if parameter.type == ToolParameter.ToolParameterType.SELECT:
                 enum = [option.value for option in parameter.options] if parameter.options else []
 
-            prompt_tool.parameters["properties"][parameter.name] = {
-                "type": parameter_type,
-                "description": parameter.llm_description or "",
-            }
+            prompt_tool.parameters["properties"][parameter.name] = (
+                {
+                    "type": parameter_type,
+                    "description": parameter.llm_description or "",
+                }
+                if parameter.input_schema is None
+                else parameter.input_schema
+            )
 
             if len(enum) > 0:
                 prompt_tool.parameters["properties"][parameter.name]["enum"] = enum

api/core/agent/plugin_entities.py

@@ -85,7 +85,7 @@ class AgentStrategyEntity(BaseModel):
     description: I18nObject = Field(..., description="The description of the agent strategy")
     output_schema: Optional[dict] = None
     features: Optional[list[AgentFeature]] = None
-
+    meta_version: Optional[str] = None
     # pydantic configs
     model_config = ConfigDict(protected_namespaces=())
 

api/core/agent/strategy/plugin.py

@@ -15,10 +15,12 @@ class PluginAgentStrategy(BaseAgentStrategy):
 
     tenant_id: str
     declaration: AgentStrategyEntity
+    meta_version: str | None = None
 
-    def __init__(self, tenant_id: str, declaration: AgentStrategyEntity):
+    def __init__(self, tenant_id: str, declaration: AgentStrategyEntity, meta_version: str | None):
         self.tenant_id = tenant_id
         self.declaration = declaration
+        self.meta_version = meta_version
 
     def get_parameters(self) -> Sequence[AgentStrategyParameter]:
         return self.declaration.parameters

api/core/entities/parameter_entities.py

@@ -21,6 +21,9 @@ class CommonParameterType(StrEnum):
     DYNAMIC_SELECT = "dynamic-select"
 
     # TOOL_SELECTOR = "tool-selector"
+    # MCP object and array type parameters
+    ARRAY = "array"
+    OBJECT = "object"
 
 
 class AppSelectorScope(StrEnum):

api/core/mcp/auth/auth_flow.py

@@ -0,0 +1,342 @@
+import base64
+import hashlib
+import json
+import os
+import secrets
+import urllib.parse
+from typing import Optional
+from urllib.parse import urljoin
+
+import requests
+from pydantic import BaseModel, ValidationError
+
+from core.mcp.auth.auth_provider import OAuthClientProvider
+from core.mcp.types import (
+    OAuthClientInformation,
+    OAuthClientInformationFull,
+    OAuthClientMetadata,
+    OAuthMetadata,
+    OAuthTokens,
+)
+from extensions.ext_redis import redis_client
+
+LATEST_PROTOCOL_VERSION = "1.0"
+OAUTH_STATE_EXPIRY_SECONDS = 5 * 60  # 5 minutes expiry
+OAUTH_STATE_REDIS_KEY_PREFIX = "oauth_state:"
+
+
+class OAuthCallbackState(BaseModel):
+    provider_id: str
+    tenant_id: str
+    server_url: str
+    metadata: OAuthMetadata | None = None
+    client_information: OAuthClientInformation
+    code_verifier: str
+    redirect_uri: str
+
+
+def generate_pkce_challenge() -> tuple[str, str]:
+    """Generate PKCE challenge and verifier."""
+    code_verifier = base64.urlsafe_b64encode(os.urandom(40)).decode("utf-8")
+    code_verifier = code_verifier.replace("=", "").replace("+", "-").replace("/", "_")
+
+    code_challenge_hash = hashlib.sha256(code_verifier.encode("utf-8")).digest()
+    code_challenge = base64.urlsafe_b64encode(code_challenge_hash).decode("utf-8")
+    code_challenge = code_challenge.replace("=", "").replace("+", "-").replace("/", "_")
+
+    return code_verifier, code_challenge
+
+
+def _create_secure_redis_state(state_data: OAuthCallbackState) -> str:
+    """Create a secure state parameter by storing state data in Redis and returning a random state key."""
+    # Generate a secure random state key
+    state_key = secrets.token_urlsafe(32)
+
+    # Store the state data in Redis with expiration
+    redis_key = f"{OAUTH_STATE_REDIS_KEY_PREFIX}{state_key}"
+    redis_client.setex(redis_key, OAUTH_STATE_EXPIRY_SECONDS, state_data.model_dump_json())
+
+    return state_key
+
+
+def _retrieve_redis_state(state_key: str) -> OAuthCallbackState:
+    """Retrieve and decode OAuth state data from Redis using the state key, then delete it."""
+    redis_key = f"{OAUTH_STATE_REDIS_KEY_PREFIX}{state_key}"
+
+    # Get state data from Redis
+    state_data = redis_client.get(redis_key)
+
+    if not state_data:
+        raise ValueError("State parameter has expired or does not exist")
+
+    # Delete the state data from Redis immediately after retrieval to prevent reuse
+    redis_client.delete(redis_key)
+
+    try:
+        # Parse and validate the state data
+        oauth_state = OAuthCallbackState.model_validate_json(state_data)
+
+        return oauth_state
+    except ValidationError as e:
+        raise ValueError(f"Invalid state parameter: {str(e)}")
+
+
+def handle_callback(state_key: str, authorization_code: str) -> OAuthCallbackState:
+    """Handle the callback from the OAuth provider."""
+    # Retrieve state data from Redis (state is automatically deleted after retrieval)
+    full_state_data = _retrieve_redis_state(state_key)
+
+    tokens = exchange_authorization(
+        full_state_data.server_url,
+        full_state_data.metadata,
+        full_state_data.client_information,
+        authorization_code,
+        full_state_data.code_verifier,
+        full_state_data.redirect_uri,
+    )
+    provider = OAuthClientProvider(full_state_data.provider_id, full_state_data.tenant_id, for_list=True)
+    provider.save_tokens(tokens)
+    return full_state_data
+
+
+def discover_oauth_metadata(server_url: str, protocol_version: Optional[str] = None) -> Optional[OAuthMetadata]:
+    """Looks up RFC 8414 OAuth 2.0 Authorization Server Metadata."""
+    url = urljoin(server_url, "/.well-known/oauth-authorization-server")
+
+    try:
+        headers = {"MCP-Protocol-Version": protocol_version or LATEST_PROTOCOL_VERSION}
+        response = requests.get(url, headers=headers)
+        if response.status_code == 404:
+            return None
+        if not response.ok:
+            raise ValueError(f"HTTP {response.status_code} trying to load well-known OAuth metadata")
+        return OAuthMetadata.model_validate(response.json())
+    except requests.RequestException as e:
+        if isinstance(e, requests.ConnectionError):
+            response = requests.get(url)
+            if response.status_code == 404:
+                return None
+            if not response.ok:
+                raise ValueError(f"HTTP {response.status_code} trying to load well-known OAuth metadata")
+            return OAuthMetadata.model_validate(response.json())
+        raise
+
+
+def start_authorization(
+    server_url: str,
+    metadata: Optional[OAuthMetadata],
+    client_information: OAuthClientInformation,
+    redirect_url: str,
+    provider_id: str,
+    tenant_id: str,
+) -> tuple[str, str]:
+    """Begins the authorization flow with secure Redis state storage."""
+    response_type = "code"
+    code_challenge_method = "S256"
+
+    if metadata:
+        authorization_url = metadata.authorization_endpoint
+        if response_type not in metadata.response_types_supported:
+            raise ValueError(f"Incompatible auth server: does not support response type {response_type}")
+        if (
+            not metadata.code_challenge_methods_supported
+            or code_challenge_method not in metadata.code_challenge_methods_supported
+        ):
+            raise ValueError(
+                f"Incompatible auth server: does not support code challenge method {code_challenge_method}"
+            )
+    else:
+        authorization_url = urljoin(server_url, "/authorize")
+
+    code_verifier, code_challenge = generate_pkce_challenge()
+
+    # Prepare state data with all necessary information
+    state_data = OAuthCallbackState(
+        provider_id=provider_id,
+        tenant_id=tenant_id,
+        server_url=server_url,
+        metadata=metadata,
+        client_information=client_information,
+        code_verifier=code_verifier,
+        redirect_uri=redirect_url,
+    )
+
+    # Store state data in Redis and generate secure state key
+    state_key = _create_secure_redis_state(state_data)
+
+    params = {
+        "response_type": response_type,
+        "client_id": client_information.client_id,
+        "code_challenge": code_challenge,
+        "code_challenge_method": code_challenge_method,
+        "redirect_uri": redirect_url,
+        "state": state_key,
+    }
+
+    authorization_url = f"{authorization_url}?{urllib.parse.urlencode(params)}"
+    return authorization_url, code_verifier
+
+
+def exchange_authorization(
+    server_url: str,
+    metadata: Optional[OAuthMetadata],
+    client_information: OAuthClientInformation,
+    authorization_code: str,
+    code_verifier: str,
+    redirect_uri: str,
+) -> OAuthTokens:
+    """Exchanges an authorization code for an access token."""
+    grant_type = "authorization_code"
+
+    if metadata:
+        token_url = metadata.token_endpoint
+        if metadata.grant_types_supported and grant_type not in metadata.grant_types_supported:
+            raise ValueError(f"Incompatible auth server: does not support grant type {grant_type}")
+    else:
+        token_url = urljoin(server_url, "/token")
+
+    params = {
+        "grant_type": grant_type,
+        "client_id": client_information.client_id,
+        "code": authorization_code,
+        "code_verifier": code_verifier,
+        "redirect_uri": redirect_uri,
+    }
+
+    if client_information.client_secret:
+        params["client_secret"] = client_information.client_secret
+
+    response = requests.post(token_url, data=params)
+    if not response.ok:
+        raise ValueError(f"Token exchange failed: HTTP {response.status_code}")
+    return OAuthTokens.model_validate(response.json())
+
+
+def refresh_authorization(
+    server_url: str,
+    metadata: Optional[OAuthMetadata],
+    client_information: OAuthClientInformation,
+    refresh_token: str,
+) -> OAuthTokens:
+    """Exchange a refresh token for an updated access token."""
+    grant_type = "refresh_token"
+
+    if metadata:
+        token_url = metadata.token_endpoint
+        if metadata.grant_types_supported and grant_type not in metadata.grant_types_supported:
+            raise ValueError(f"Incompatible auth server: does not support grant type {grant_type}")
+    else:
+        token_url = urljoin(server_url, "/token")
+
+    params = {
+        "grant_type": grant_type,
+        "client_id": client_information.client_id,
+        "refresh_token": refresh_token,
+    }
+
+    if client_information.client_secret:
+        params["client_secret"] = client_information.client_secret
+
+    response = requests.post(token_url, data=params)
+    if not response.ok:
+        raise ValueError(f"Token refresh failed: HTTP {response.status_code}")
+    return OAuthTokens.parse_obj(response.json())
+
+
+def register_client(
+    server_url: str,
+    metadata: Optional[OAuthMetadata],
+    client_metadata: OAuthClientMetadata,
+) -> OAuthClientInformationFull:
+    """Performs OAuth 2.0 Dynamic Client Registration."""
+    if metadata:
+        if not metadata.registration_endpoint:
+            raise ValueError("Incompatible auth server: does not support dynamic client registration")
+        registration_url = metadata.registration_endpoint
+    else:
+        registration_url = urljoin(server_url, "/register")
+
+    response = requests.post(
+        registration_url,
+        json=client_metadata.model_dump(),
+        headers={"Content-Type": "application/json"},
+    )
+    if not response.ok:
+        response.raise_for_status()
+    return OAuthClientInformationFull.model_validate(response.json())
+
+
+def auth(
+    provider: OAuthClientProvider,
+    server_url: str,
+    authorization_code: Optional[str] = None,
+    state_param: Optional[str] = None,
+    for_list: bool = False,
+) -> dict[str, str]:
+    """Orchestrates the full auth flow with a server using secure Redis state storage."""
+    metadata = discover_oauth_metadata(server_url)
+
+    # Handle client registration if needed
+    client_information = provider.client_information()
+    if not client_information:
+        if authorization_code is not None:
+            raise ValueError("Existing OAuth client information is required when exchanging an authorization code")
+        try:
+            full_information = register_client(server_url, metadata, provider.client_metadata)
+        except requests.RequestException as e:
+            raise ValueError(f"Could not register OAuth client: {e}")
+        provider.save_client_information(full_information)
+        client_information = full_information
+
+    # Exchange authorization code for tokens
+    if authorization_code is not None:
+        if not state_param:
+            raise ValueError("State parameter is required when exchanging authorization code")
+
+        try:
+            # Retrieve state data from Redis using state key
+            full_state_data = _retrieve_redis_state(state_param)
+
+            code_verifier = full_state_data.code_verifier
+            redirect_uri = full_state_data.redirect_uri
+
+            if not code_verifier or not redirect_uri:
+                raise ValueError("Missing code_verifier or redirect_uri in state data")
+
+        except (json.JSONDecodeError, ValueError) as e:
+            raise ValueError(f"Invalid state parameter: {e}")
+
+        tokens = exchange_authorization(
+            server_url,
+            metadata,
+            client_information,
+            authorization_code,
+            code_verifier,
+            redirect_uri,
+        )
+        provider.save_tokens(tokens)
+        return {"result": "success"}
+
+    provider_tokens = provider.tokens()
+
+    # Handle token refresh or new authorization
+    if provider_tokens and provider_tokens.refresh_token:
+        try:
+            new_tokens = refresh_authorization(server_url, metadata, client_information, provider_tokens.refresh_token)
+            provider.save_tokens(new_tokens)
+            return {"result": "success"}
+        except Exception as e:
+            raise ValueError(f"Could not refresh OAuth tokens: {e}")
+
+    # Start new authorization flow
+    authorization_url, code_verifier = start_authorization(
+        server_url,
+        metadata,
+        client_information,
+        provider.redirect_url,
+        provider.mcp_provider.id,
+        provider.mcp_provider.tenant_id,
+    )
+
+    provider.save_code_verifier(code_verifier)
+    return {"authorization_url": authorization_url}

api/core/mcp/auth/auth_provider.py

@@ -0,0 +1,81 @@
+from typing import Optional
+
+from configs import dify_config
+from core.mcp.types import (
+    OAuthClientInformation,
+    OAuthClientInformationFull,
+    OAuthClientMetadata,
+    OAuthTokens,
+)
+from models.tools import MCPToolProvider
+from services.tools.mcp_tools_mange_service import MCPToolManageService
+
+LATEST_PROTOCOL_VERSION = "1.0"
+
+
+class OAuthClientProvider:
+    mcp_provider: MCPToolProvider
+
+    def __init__(self, provider_id: str, tenant_id: str, for_list: bool = False):
+        if for_list:
+            self.mcp_provider = MCPToolManageService.get_mcp_provider_by_provider_id(provider_id, tenant_id)
+        else:
+            self.mcp_provider = MCPToolManageService.get_mcp_provider_by_server_identifier(provider_id, tenant_id)
+
+    @property
+    def redirect_url(self) -> str:
+        """The URL to redirect the user agent to after authorization."""
+        return dify_config.CONSOLE_API_URL + "/console/api/mcp/oauth/callback"
+
+    @property
+    def client_metadata(self) -> OAuthClientMetadata:
+        """Metadata about this OAuth client."""
+        return OAuthClientMetadata(
+            redirect_uris=[self.redirect_url],
+            token_endpoint_auth_method="none",
+            grant_types=["authorization_code", "refresh_token"],
+            response_types=["code"],
+            client_name="Dify",
+            client_uri="https://github.com/langgenius/dify",
+        )
+
+    def client_information(self) -> Optional[OAuthClientInformation]:
+        """Loads information about this OAuth client."""
+        client_information = self.mcp_provider.decrypted_credentials.get("client_information", {})
+        if not client_information:
+            return None
+        return OAuthClientInformation.model_validate(client_information)
+
+    def save_client_information(self, client_information: OAuthClientInformationFull) -> None:
+        """Saves client information after dynamic registration."""
+        MCPToolManageService.update_mcp_provider_credentials(
+            self.mcp_provider,
+            {"client_information": client_information.model_dump()},
+        )
+
+    def tokens(self) -> Optional[OAuthTokens]:
+        """Loads any existing OAuth tokens for the current session."""
+        credentials = self.mcp_provider.decrypted_credentials
+        if not credentials:
+            return None
+        return OAuthTokens(
+            access_token=credentials.get("access_token", ""),
+            token_type=credentials.get("token_type", "Bearer"),
+            expires_in=int(credentials.get("expires_in", "3600") or 3600),
+            refresh_token=credentials.get("refresh_token", ""),
+        )
+
+    def save_tokens(self, tokens: OAuthTokens) -> None:
+        """Stores new OAuth tokens for the current session."""
+        # update mcp provider credentials
+        token_dict = tokens.model_dump()
+        MCPToolManageService.update_mcp_provider_credentials(self.mcp_provider, token_dict, authed=True)
+
+    def save_code_verifier(self, code_verifier: str) -> None:
+        """Saves a PKCE code verifier for the current session."""
+        MCPToolManageService.update_mcp_provider_credentials(self.mcp_provider, {"code_verifier": code_verifier})
+
+    def code_verifier(self) -> str:
+        """Loads the PKCE code verifier for the current session."""
+        # get code verifier from mcp provider credentials
+        return str(self.mcp_provider.decrypted_credentials.get("code_verifier", ""))

api/core/mcp/client/sse_client.py

@@ -0,0 +1,361 @@
+import logging
+import queue
+from collections.abc import Generator
+from concurrent.futures import ThreadPoolExecutor
+from contextlib import contextmanager
+from typing import Any, TypeAlias, final
+from urllib.parse import urljoin, urlparse
+
+import httpx
+from sseclient import SSEClient
+
+from core.mcp import types
+from core.mcp.error import MCPAuthError, MCPConnectionError
+from core.mcp.types import SessionMessage
+from core.mcp.utils import create_ssrf_proxy_mcp_http_client, ssrf_proxy_sse_connect
+
+logger = logging.getLogger(__name__)
+
+DEFAULT_QUEUE_READ_TIMEOUT = 3
+
+
+@final
+class _StatusReady:
+    def __init__(self, endpoint_url: str):
+        self._endpoint_url = endpoint_url
+
+
+@final
+class _StatusError:
+    def __init__(self, exc: Exception):
+        self._exc = exc
+
+
+# Type aliases for better readability
+ReadQueue: TypeAlias = queue.Queue[SessionMessage | Exception | None]
+WriteQueue: TypeAlias = queue.Queue[SessionMessage | Exception | None]
+StatusQueue: TypeAlias = queue.Queue[_StatusReady | _StatusError]
+
+
+def remove_request_params(url: str) -> str:
+    """Remove request parameters from URL, keeping only the path."""
+    return urljoin(url, urlparse(url).path)
+
+
+class SSETransport:
+    """SSE client transport implementation."""
+
+    def __init__(
+        self,
+        url: str,
+        headers: dict[str, Any] | None = None,
+        timeout: float = 5.0,
+        sse_read_timeout: float = 5 * 60,
+    ) -> None:
+        """Initialize the SSE transport.
+
+        Args:
+            url: The SSE endpoint URL.
+            headers: Optional headers to include in requests.
+            timeout: HTTP timeout for regular operations.
+            sse_read_timeout: Timeout for SSE read operations.
+        """
+        self.url = url
+        self.headers = headers or {}
+        self.timeout = timeout
+        self.sse_read_timeout = sse_read_timeout
+        self.endpoint_url: str | None = None
+
+    def _validate_endpoint_url(self, endpoint_url: str) -> bool:
+        """Validate that the endpoint URL matches the connection origin.
+
+        Args:
+            endpoint_url: The endpoint URL to validate.
+
+        Returns:
+            True if valid, False otherwise.
+        """
+        url_parsed = urlparse(self.url)
+        endpoint_parsed = urlparse(endpoint_url)
+
+        return url_parsed.netloc == endpoint_parsed.netloc and url_parsed.scheme == endpoint_parsed.scheme
+
+    def _handle_endpoint_event(self, sse_data: str, status_queue: StatusQueue) -> None:
+        """Handle an 'endpoint' SSE event.
+
+        Args:
+            sse_data: The SSE event data.
+            status_queue: Queue to put status updates.
+        """
+        endpoint_url = urljoin(self.url, sse_data)
+        logger.info(f"Received endpoint URL: {endpoint_url}")
+
+        if not self._validate_endpoint_url(endpoint_url):
+            error_msg = f"Endpoint origin does not match connection origin: {endpoint_url}"
+            logger.error(error_msg)
+            status_queue.put(_StatusError(ValueError(error_msg)))
+            return
+
+        status_queue.put(_StatusReady(endpoint_url))
+
+    def _handle_message_event(self, sse_data: str, read_queue: ReadQueue) -> None:
+        """Handle a 'message' SSE event.
+
+        Args:
+            sse_data: The SSE event data.
+            read_queue: Queue to put parsed messages.
+        """
+        try:
+            message = types.JSONRPCMessage.model_validate_json(sse_data)
+            logger.debug(f"Received server message: {message}")
+            session_message = SessionMessage(message)
+            read_queue.put(session_message)
+        except Exception as exc:
+            logger.exception("Error parsing server message")
+            read_queue.put(exc)
+
+    def _handle_sse_event(self, sse, read_queue: ReadQueue, status_queue: StatusQueue) -> None:
+        """Handle a single SSE event.
+
+        Args:
+            sse: The SSE event object.
+            read_queue: Queue for message events.
+            status_queue: Queue for status events.
+        """
+        match sse.event:
+            case "endpoint":
+                self._handle_endpoint_event(sse.data, status_queue)
+            case "message":
+                self._handle_message_event(sse.data, read_queue)
+            case _:
+                logger.warning(f"Unknown SSE event: {sse.event}")
+
+    def sse_reader(self, event_source, read_queue: ReadQueue, status_queue: StatusQueue) -> None:
+        """Read and process SSE events.
+
+        Args:
+            event_source: The SSE event source.
+            read_queue: Queue to put received messages.
+            status_queue: Queue to put status updates.
+        """
+        try:
+            for sse in event_source.iter_sse():
+                self._handle_sse_event(sse, read_queue, status_queue)
+        except httpx.ReadError as exc:
+            logger.debug(f"SSE reader shutting down normally: {exc}")
+        except Exception as exc:
+            read_queue.put(exc)
+        finally:
+            read_queue.put(None)
+
+    def _send_message(self, client: httpx.Client, endpoint_url: str, message: SessionMessage) -> None:
+        """Send a single message to the server.
+
+        Args:
+            client: HTTP client to use.
+            endpoint_url: The endpoint URL to send to.
+            message: The message to send.
+        """
+        response = client.post(
+            endpoint_url,
+            json=message.message.model_dump(
+                by_alias=True,
+                mode="json",
+                exclude_none=True,
+            ),
+        )
+        response.raise_for_status()
+        logger.debug(f"Client message sent successfully: {response.status_code}")
+
+    def post_writer(self, client: httpx.Client, endpoint_url: str, write_queue: WriteQueue) -> None:
+        """Handle writing messages to the server.
+
+        Args:
+            client: HTTP client to use.
+            endpoint_url: The endpoint URL to send messages to.
+            write_queue: Queue to read messages from.
+        """
+        try:
+            while True:
+                try:
+                    message = write_queue.get(timeout=DEFAULT_QUEUE_READ_TIMEOUT)
+                    if message is None:
+                        break
+                    if isinstance(message, Exception):
+                        write_queue.put(message)
+                        continue
+
+                    self._send_message(client, endpoint_url, message)
+
+                except queue.Empty:
+                    continue
+        except httpx.ReadError as exc:
+            logger.debug(f"Post writer shutting down normally: {exc}")
+        except Exception as exc:
+            logger.exception("Error writing messages")
+            write_queue.put(exc)
+        finally:
+            write_queue.put(None)
+
+    def _wait_for_endpoint(self, status_queue: StatusQueue) -> str:
+        """Wait for the endpoint URL from the status queue.
+
+        Args:
+            status_queue: Queue to read status from.
+
+        Returns:
+            The endpoint URL.
+
+        Raises:
+            ValueError: If endpoint URL is not received or there's an error.
+        """
+        try:
+            status = status_queue.get(timeout=1)
+        except queue.Empty:
+            raise ValueError("failed to get endpoint URL")
+
+        if isinstance(status, _StatusReady):
+            return status._endpoint_url
+        elif isinstance(status, _StatusError):
+            raise status._exc
+        else:
+            raise ValueError("failed to get endpoint URL")
+
+    def connect(
+        self,
+        executor: ThreadPoolExecutor,
+        client: httpx.Client,
+        event_source,
+    ) -> tuple[ReadQueue, WriteQueue]:
+        """Establish connection and start worker threads.
+
+        Args:
+            executor: Thread pool executor.
+            client: HTTP client.
+            event_source: SSE event source.
+
+        Returns:
+            Tuple of (read_queue, write_queue).
+        """
+        read_queue: ReadQueue = queue.Queue()
+        write_queue: WriteQueue = queue.Queue()
+        status_queue: StatusQueue = queue.Queue()
+
+        # Start SSE reader thread
+        executor.submit(self.sse_reader, event_source, read_queue, status_queue)
+
+        # Wait for endpoint URL
+        endpoint_url = self._wait_for_endpoint(status_queue)
+        self.endpoint_url = endpoint_url
+
+        # Start post writer thread
+        executor.submit(self.post_writer, client, endpoint_url, write_queue)
+
+        return read_queue, write_queue
+
+
+@contextmanager
+def sse_client(
+    url: str,
+    headers: dict[str, Any] | None = None,
+    timeout: float = 5.0,
+    sse_read_timeout: float = 5 * 60,
+) -> Generator[tuple[ReadQueue, WriteQueue], None, None]:
+    """
+    Client transport for SSE.
+    `sse_read_timeout` determines how long (in seconds) the client will wait for a new
+    event before disconnecting. All other HTTP operations are controlled by `timeout`.
+
+    Args:
+        url: The SSE endpoint URL.
+        headers: Optional headers to include in requests.
+        timeout: HTTP timeout for regular operations.
+        sse_read_timeout: Timeout for SSE read operations.
+
+    Yields:
+        Tuple of (read_queue, write_queue) for message communication.
+    """
+    transport = SSETransport(url, headers, timeout, sse_read_timeout)
+
+    read_queue: ReadQueue | None = None
+    write_queue: WriteQueue | None = None
+
+    with ThreadPoolExecutor() as executor:
+        try:
+            with create_ssrf_proxy_mcp_http_client(headers=transport.headers) as client:
+                with ssrf_proxy_sse_connect(
+                    url, timeout=httpx.Timeout(timeout, read=sse_read_timeout), client=client
+                ) as event_source:
+                    event_source.response.raise_for_status()
+
+                    read_queue, write_queue = transport.connect(executor, client, event_source)
+
+                    yield read_queue, write_queue
+
+        except httpx.HTTPStatusError as exc:
+            if exc.response.status_code == 401:
+                raise MCPAuthError()
+            raise MCPConnectionError()
+        except Exception:
+            logger.exception("Error connecting to SSE endpoint")
+            raise
+        finally:
+            # Clean up queues
+            if read_queue:
+                read_queue.put(None)
+            if write_queue:
+                write_queue.put(None)
+
+
+def send_message(http_client: httpx.Client, endpoint_url: str, session_message: SessionMessage) -> None:
+    """
+    Send a message to the server using the provided HTTP client.
+
+    Args:
+        http_client: The HTTP client to use for sending
+        endpoint_url: The endpoint URL to send the message to
+        session_message: The message to send
+    """
+    try:
+        response = http_client.post(
+            endpoint_url,
+            json=session_message.message.model_dump(
+                by_alias=True,
+                mode="json",
+                exclude_none=True,
+            ),
+        )
+        response.raise_for_status()
+        logger.debug(f"Client message sent successfully: {response.status_code}")
+    except Exception as exc:
+        logger.exception("Error sending message")
+        raise
+
+
+def read_messages(
+    sse_client: SSEClient,
+) -> Generator[SessionMessage | Exception, None, None]:
+    """
+    Read messages from the SSE client.
+
+    Args:
+        sse_client: The SSE client to read from
+
+    Yields:
+        SessionMessage or Exception for each event received
+    """
+    try:
+        for sse in sse_client.events():
+            if sse.event == "message":
+                try:
+                    message = types.JSONRPCMessage.model_validate_json(sse.data)
+                    logger.debug(f"Received server message: {message}")
+                    yield SessionMessage(message)
+                except Exception as exc:
+                    logger.exception("Error parsing server message")
+                    yield exc
+            else:
+                logger.warning(f"Unknown SSE event: {sse.event}")
+    except Exception as exc:
+        logger.exception("Error reading SSE messages")
+        yield exc

api/core/mcp/client/streamable_client.py

@@ -0,0 +1,476 @@
+"""
+StreamableHTTP Client Transport Module
+
+This module implements the StreamableHTTP transport for MCP clients,
+providing support for HTTP POST requests with optional SSE streaming responses
+and session management.
+"""
+
+import logging
+import queue
+from collections.abc import Callable, Generator
+from concurrent.futures import ThreadPoolExecutor
+from contextlib import contextmanager
+from dataclasses import dataclass
+from datetime import timedelta
+from typing import Any, cast
+
+import httpx
+from httpx_sse import EventSource, ServerSentEvent
+
+from core.mcp.types import (
+    ClientMessageMetadata,
+    ErrorData,
+    JSONRPCError,
+    JSONRPCMessage,
+    JSONRPCNotification,
+    JSONRPCRequest,
+    JSONRPCResponse,
+    RequestId,
+    SessionMessage,
+)
+from core.mcp.utils import create_ssrf_proxy_mcp_http_client, ssrf_proxy_sse_connect
+
+logger = logging.getLogger(__name__)
+
+
+SessionMessageOrError = SessionMessage | Exception | None
+# Queue types with clearer names for their roles
+ServerToClientQueue = queue.Queue[SessionMessageOrError]  # Server to client messages
+ClientToServerQueue = queue.Queue[SessionMessage | None]  # Client to server messages
+GetSessionIdCallback = Callable[[], str | None]
+
+MCP_SESSION_ID = "mcp-session-id"
+LAST_EVENT_ID = "last-event-id"
+CONTENT_TYPE = "content-type"
+ACCEPT = "Accept"
+
+
+JSON = "application/json"
+SSE = "text/event-stream"
+
+DEFAULT_QUEUE_READ_TIMEOUT = 3
+
+
+class StreamableHTTPError(Exception):
+    """Base exception for StreamableHTTP transport errors."""
+
+    pass
+
+
+class ResumptionError(StreamableHTTPError):
+    """Raised when resumption request is invalid."""
+
+    pass
+
+
+@dataclass
+class RequestContext:
+    """Context for a request operation."""
+
+    client: httpx.Client
+    headers: dict[str, str]
+    session_id: str | None
+    session_message: SessionMessage
+    metadata: ClientMessageMetadata | None
+    server_to_client_queue: ServerToClientQueue  # Renamed for clarity
+    sse_read_timeout: timedelta
+
+
+class StreamableHTTPTransport:
+    """StreamableHTTP client transport implementation."""
+
+    def __init__(
+        self,
+        url: str,
+        headers: dict[str, Any] | None = None,
+        timeout: timedelta = timedelta(seconds=30),
+        sse_read_timeout: timedelta = timedelta(seconds=60 * 5),
+    ) -> None:
+        """Initialize the StreamableHTTP transport.
+
+        Args:
+            url: The endpoint URL.
+            headers: Optional headers to include in requests.
+            timeout: HTTP timeout for regular operations.
+            sse_read_timeout: Timeout for SSE read operations.
+        """
+        self.url = url
+        self.headers = headers or {}
+        self.timeout = timeout
+        self.sse_read_timeout = sse_read_timeout
+        self.session_id: str | None = None
+        self.request_headers = {
+            ACCEPT: f"{JSON}, {SSE}",
+            CONTENT_TYPE: JSON,
+            **self.headers,
+        }
+
+    def _update_headers_with_session(self, base_headers: dict[str, str]) -> dict[str, str]:
+        """Update headers with session ID if available."""
+        headers = base_headers.copy()
+        if self.session_id:
+            headers[MCP_SESSION_ID] = self.session_id
+        return headers
+
+    def _is_initialization_request(self, message: JSONRPCMessage) -> bool:
+        """Check if the message is an initialization request."""
+        return isinstance(message.root, JSONRPCRequest) and message.root.method == "initialize"
+
+    def _is_initialized_notification(self, message: JSONRPCMessage) -> bool:
+        """Check if the message is an initialized notification."""
+        return isinstance(message.root, JSONRPCNotification) and message.root.method == "notifications/initialized"
+
+    def _maybe_extract_session_id_from_response(
+        self,
+        response: httpx.Response,
+    ) -> None:
+        """Extract and store session ID from response headers."""
+        new_session_id = response.headers.get(MCP_SESSION_ID)
+        if new_session_id:
+            self.session_id = new_session_id
+            logger.info(f"Received session ID: {self.session_id}")
+
+    def _handle_sse_event(
+        self,
+        sse: ServerSentEvent,
+        server_to_client_queue: ServerToClientQueue,
+        original_request_id: RequestId | None = None,
+        resumption_callback: Callable[[str], None] | None = None,
+    ) -> bool:
+        """Handle an SSE event, returning True if the response is complete."""
+        if sse.event == "message":
+            try:
+                message = JSONRPCMessage.model_validate_json(sse.data)
+                logger.debug(f"SSE message: {message}")
+
+                # If this is a response and we have original_request_id, replace it
+                if original_request_id is not None and isinstance(message.root, JSONRPCResponse | JSONRPCError):
+                    message.root.id = original_request_id
+
+                session_message = SessionMessage(message)
+                # Put message in queue that goes to client
+                server_to_client_queue.put(session_message)
+
+                # Call resumption token callback if we have an ID
+                if sse.id and resumption_callback:
+                    resumption_callback(sse.id)
+
+                # If this is a response or error return True indicating completion
+                # Otherwise, return False to continue listening
+                return isinstance(message.root, JSONRPCResponse | JSONRPCError)
+
+            except Exception as exc:
+                # Put exception in queue that goes to client
+                server_to_client_queue.put(exc)
+                return False
+        elif sse.event == "ping":
+            logger.debug("Received ping event")
+            return False
+        else:
+            logger.warning(f"Unknown SSE event: {sse.event}")
+            return False
+
+    def handle_get_stream(
+        self,
+        client: httpx.Client,
+        server_to_client_queue: ServerToClientQueue,
+    ) -> None:
+        """Handle GET stream for server-initiated messages."""
+        try:
+            if not self.session_id:
+                return
+
+            headers = self._update_headers_with_session(self.request_headers)
+
+            with ssrf_proxy_sse_connect(
+                self.url,
+                headers=headers,
+                timeout=httpx.Timeout(self.timeout.seconds, read=self.sse_read_timeout.seconds),
+                client=client,
+                method="GET",
+            ) as event_source:
+                event_source.response.raise_for_status()
+                logger.debug("GET SSE connection established")
+
+                for sse in event_source.iter_sse():
+                    self._handle_sse_event(sse, server_to_client_queue)
+
+        except Exception as exc:
+            logger.debug(f"GET stream error (non-fatal): {exc}")
+
+    def _handle_resumption_request(self, ctx: RequestContext) -> None:
+        """Handle a resumption request using GET with SSE."""
+        headers = self._update_headers_with_session(ctx.headers)
+        if ctx.metadata and ctx.metadata.resumption_token:
+            headers[LAST_EVENT_ID] = ctx.metadata.resumption_token
+        else:
+            raise ResumptionError("Resumption request requires a resumption token")
+
+        # Extract original request ID to map responses
+        original_request_id = None
+        if isinstance(ctx.session_message.message.root, JSONRPCRequest):
+            original_request_id = ctx.session_message.message.root.id
+
+        with ssrf_proxy_sse_connect(
+            self.url,
+            headers=headers,
+            timeout=httpx.Timeout(self.timeout.seconds, read=ctx.sse_read_timeout.seconds),
+            client=ctx.client,
+            method="GET",
+        ) as event_source:
+            event_source.response.raise_for_status()
+            logger.debug("Resumption GET SSE connection established")
+
+            for sse in event_source.iter_sse():
+                is_complete = self._handle_sse_event(
+                    sse,
+                    ctx.server_to_client_queue,
+                    original_request_id,
+                    ctx.metadata.on_resumption_token_update if ctx.metadata else None,
+                )
+                if is_complete:
+                    break
+
+    def _handle_post_request(self, ctx: RequestContext) -> None:
+        """Handle a POST request with response processing."""
+        headers = self._update_headers_with_session(ctx.headers)
+        message = ctx.session_message.message
+        is_initialization = self._is_initialization_request(message)
+
+        with ctx.client.stream(
+            "POST",
+            self.url,
+            json=message.model_dump(by_alias=True, mode="json", exclude_none=True),
+            headers=headers,
+        ) as response:
+            if response.status_code == 202:
+                logger.debug("Received 202 Accepted")
+                return
+
+            if response.status_code == 404:
+                if isinstance(message.root, JSONRPCRequest):
+                    self._send_session_terminated_error(
+                        ctx.server_to_client_queue,
+                        message.root.id,
+                    )
+                return
+
+            response.raise_for_status()
+            if is_initialization:
+                self._maybe_extract_session_id_from_response(response)
+
+            content_type = cast(str, response.headers.get(CONTENT_TYPE, "").lower())
+
+            if content_type.startswith(JSON):
+                self._handle_json_response(response, ctx.server_to_client_queue)
+            elif content_type.startswith(SSE):
+                self._handle_sse_response(response, ctx)
+            else:
+                self._handle_unexpected_content_type(
+                    content_type,
+                    ctx.server_to_client_queue,
+                )
+
+    def _handle_json_response(
+        self,
+        response: httpx.Response,
+        server_to_client_queue: ServerToClientQueue,
+    ) -> None:
+        """Handle JSON response from the server."""
+        try:
+            content = response.read()
+            message = JSONRPCMessage.model_validate_json(content)
+            session_message = SessionMessage(message)
+            server_to_client_queue.put(session_message)
+        except Exception as exc:
+            server_to_client_queue.put(exc)
+
+    def _handle_sse_response(self, response: httpx.Response, ctx: RequestContext) -> None:
+        """Handle SSE response from the server."""
+        try:
+            event_source = EventSource(response)
+            for sse in event_source.iter_sse():
+                is_complete = self._handle_sse_event(
+                    sse,
+                    ctx.server_to_client_queue,
+                    resumption_callback=(ctx.metadata.on_resumption_token_update if ctx.metadata else None),
+                )
+                if is_complete:
+                    break
+        except Exception as e:
+            ctx.server_to_client_queue.put(e)
+
+    def _handle_unexpected_content_type(
+        self,
+        content_type: str,
+        server_to_client_queue: ServerToClientQueue,
+    ) -> None:
+        """Handle unexpected content type in response."""
+        error_msg = f"Unexpected content type: {content_type}"
+        logger.error(error_msg)
+        server_to_client_queue.put(ValueError(error_msg))
+
+    def _send_session_terminated_error(
+        self,
+        server_to_client_queue: ServerToClientQueue,
+        request_id: RequestId,
+    ) -> None:
+        """Send a session terminated error response."""
+        jsonrpc_error = JSONRPCError(
+            jsonrpc="2.0",
+            id=request_id,
+            error=ErrorData(code=32600, message="Session terminated by server"),
+        )
+        session_message = SessionMessage(JSONRPCMessage(jsonrpc_error))
+        server_to_client_queue.put(session_message)
+
+    def post_writer(
+        self,
+        client: httpx.Client,
+        client_to_server_queue: ClientToServerQueue,
+        server_to_client_queue: ServerToClientQueue,
+        start_get_stream: Callable[[], None],
+    ) -> None:
+        """Handle writing requests to the server.
+
+        This method processes messages from the client_to_server_queue and sends them to the server.
+        Responses are written to the server_to_client_queue.
+        """
+        while True:
+            try:
+                # Read message from client queue with timeout to check stop_event periodically
+                session_message = client_to_server_queue.get(timeout=DEFAULT_QUEUE_READ_TIMEOUT)
+                if session_message is None:
+                    break
+
+                message = session_message.message
+                metadata = (
+                    session_message.metadata if isinstance(session_message.metadata, ClientMessageMetadata) else None
+                )
+
+                # Check if this is a resumption request
+                is_resumption = bool(metadata and metadata.resumption_token)
+
+                logger.debug(f"Sending client message: {message}")
+
+                # Handle initialized notification
+                if self._is_initialized_notification(message):
+                    start_get_stream()
+
+                ctx = RequestContext(
+                    client=client,
+                    headers=self.request_headers,
+                    session_id=self.session_id,
+                    session_message=session_message,
+                    metadata=metadata,
+                    server_to_client_queue=server_to_client_queue,  # Queue to write responses to client
+                    sse_read_timeout=self.sse_read_timeout,
+                )
+
+                if is_resumption:
+                    self._handle_resumption_request(ctx)
+                else:
+                    self._handle_post_request(ctx)
+            except queue.Empty:
+                continue
+            except Exception as exc:
+                server_to_client_queue.put(exc)
+
+    def terminate_session(self, client: httpx.Client) -> None:
+        """Terminate the session by sending a DELETE request."""
+        if not self.session_id:
+            return
+
+        try:
+            headers = self._update_headers_with_session(self.request_headers)
+            response = client.delete(self.url, headers=headers)
+
+            if response.status_code == 405:
+                logger.debug("Server does not allow session termination")
+            elif response.status_code != 200:
+                logger.warning(f"Session termination failed: {response.status_code}")
+        except Exception as exc:
+            logger.warning(f"Session termination failed: {exc}")
+
+    def get_session_id(self) -> str | None:
+        """Get the current session ID."""
+        return self.session_id
+
+
+@contextmanager
+def streamablehttp_client(
+    url: str,
+    headers: dict[str, Any] | None = None,
+    timeout: timedelta = timedelta(seconds=30),
+    sse_read_timeout: timedelta = timedelta(seconds=60 * 5),
+    terminate_on_close: bool = True,
+) -> Generator[
+    tuple[
+        ServerToClientQueue,  # Queue for receiving messages FROM server
+        ClientToServerQueue,  # Queue for sending messages TO server
+        GetSessionIdCallback,
+    ],
+    None,
+    None,
+]:
+    """
+    Client transport for StreamableHTTP.
+
+    `sse_read_timeout` determines how long (in seconds) the client will wait for a new
+    event before disconnecting. All other HTTP operations are controlled by `timeout`.
+
+    Yields:
+        Tuple containing:
+            - server_to_client_queue: Queue for reading messages FROM the server
+            - client_to_server_queue: Queue for sending messages TO the server
+            - get_session_id_callback: Function to retrieve the current session ID
+    """
+    transport = StreamableHTTPTransport(url, headers, timeout, sse_read_timeout)
+
+    # Create queues with clear directional meaning
+    server_to_client_queue: ServerToClientQueue = queue.Queue()  # For messages FROM server TO client
+    client_to_server_queue: ClientToServerQueue = queue.Queue()  # For messages FROM client TO server
+
+    with ThreadPoolExecutor(max_workers=2) as executor:
+        try:
+            with create_ssrf_proxy_mcp_http_client(
+                headers=transport.request_headers,
+                timeout=httpx.Timeout(transport.timeout.seconds, read=transport.sse_read_timeout.seconds),
+            ) as client:
+                # Define callbacks that need access to thread pool
+                def start_get_stream() -> None:
+                    """Start a worker thread to handle server-initiated messages."""
+                    executor.submit(transport.handle_get_stream, client, server_to_client_queue)
+
+                # Start the post_writer worker thread
+                executor.submit(
+                    transport.post_writer,
+                    client,
+                    client_to_server_queue,  # Queue for messages FROM client TO server
+                    server_to_client_queue,  # Queue for messages FROM server TO client
+                    start_get_stream,
+                )
+
+                try:
+                    yield (
+                        server_to_client_queue,  # Queue for receiving messages FROM server
+                        client_to_server_queue,  # Queue for sending messages TO server
+                        transport.get_session_id,
+                    )
+                finally:
+                    if transport.session_id and terminate_on_close:
+                        transport.terminate_session(client)
+
+                    # Signal threads to stop
+                    client_to_server_queue.put(None)
+        finally:
+            # Clear any remaining items and add None sentinel to unblock any waiting threads
+            try:
+                while not client_to_server_queue.empty():
+                    client_to_server_queue.get_nowait()
+            except queue.Empty:
+                pass
+
+            client_to_server_queue.put(None)
+            server_to_client_queue.put(None)

api/core/mcp/entities.py

@@ -0,0 +1,19 @@
+from dataclasses import dataclass
+from typing import Any, Generic, TypeVar
+
+from core.mcp.session.base_session import BaseSession
+from core.mcp.types import LATEST_PROTOCOL_VERSION, RequestId, RequestParams
+
+SUPPORTED_PROTOCOL_VERSIONS: list[str] = ["2024-11-05", LATEST_PROTOCOL_VERSION]
+
+
+SessionT = TypeVar("SessionT", bound=BaseSession[Any, Any, Any, Any, Any])
+LifespanContextT = TypeVar("LifespanContextT")
+
+
+@dataclass
+class RequestContext(Generic[SessionT, LifespanContextT]):
+    request_id: RequestId
+    meta: RequestParams.Meta | None
+    session: SessionT
+    lifespan_context: LifespanContextT

api/core/mcp/error.py

@@ -0,0 +1,10 @@
+class MCPError(Exception):
+    pass
+
+
+class MCPConnectionError(MCPError):
+    pass
+
+
+class MCPAuthError(MCPConnectionError):
+    pass

api/core/mcp/mcp_client.py

@@ -0,0 +1,150 @@
+import logging
+from collections.abc import Callable
+from contextlib import AbstractContextManager, ExitStack
+from types import TracebackType
+from typing import Any, Optional, cast
+from urllib.parse import urlparse
+
+from core.mcp.client.sse_client import sse_client
+from core.mcp.client.streamable_client import streamablehttp_client
+from core.mcp.error import MCPAuthError, MCPConnectionError
+from core.mcp.session.client_session import ClientSession
+from core.mcp.types import Tool
+
+logger = logging.getLogger(__name__)
+
+
+class MCPClient:
+    def __init__(
+        self,
+        server_url: str,
+        provider_id: str,
+        tenant_id: str,
+        authed: bool = True,
+        authorization_code: Optional[str] = None,
+        for_list: bool = False,
+    ):
+        # Initialize info
+        self.provider_id = provider_id
+        self.tenant_id = tenant_id
+        self.client_type = "streamable"
+        self.server_url = server_url
+
+        # Authentication info
+        self.authed = authed
+        self.authorization_code = authorization_code
+        if authed:
+            from core.mcp.auth.auth_provider import OAuthClientProvider
+
+            self.provider = OAuthClientProvider(self.provider_id, self.tenant_id, for_list=for_list)
+            self.token = self.provider.tokens()
+
+        # Initialize session and client objects
+        self._session: Optional[ClientSession] = None
+        self._streams_context: Optional[AbstractContextManager[Any]] = None
+        self._session_context: Optional[ClientSession] = None
+        self.exit_stack = ExitStack()
+
+        # Whether the client has been initialized
+        self._initialized = False
+
+    def __enter__(self):
+        self._initialize()
+        self._initialized = True
+        return self
+
+    def __exit__(
+        self, exc_type: Optional[type], exc_value: Optional[BaseException], traceback: Optional[TracebackType]
+    ):
+        self.cleanup()
+
+    def _initialize(
+        self,
+    ):
+        """Initialize the client with fallback to SSE if streamable connection fails"""
+        connection_methods: dict[str, Callable[..., AbstractContextManager[Any]]] = {
+            "mcp": streamablehttp_client,
+            "sse": sse_client,
+        }
+
+        parsed_url = urlparse(self.server_url)
+        path = parsed_url.path
+        method_name = path.rstrip("/").split("/")[-1] if path else ""
+        try:
+            client_factory = connection_methods[method_name]
+            self.connect_server(client_factory, method_name)
+        except KeyError:
+            try:
+                self.connect_server(sse_client, "sse")
+            except MCPConnectionError:
+                self.connect_server(streamablehttp_client, "mcp")
+
+    def connect_server(
+        self, client_factory: Callable[..., AbstractContextManager[Any]], method_name: str, first_try: bool = True
+    ):
+        from core.mcp.auth.auth_flow import auth
+
+        try:
+            headers = (
+                {"Authorization": f"{self.token.token_type.capitalize()} {self.token.access_token}"}
+                if self.authed and self.token
+                else {}
+            )
+            self._streams_context = client_factory(url=self.server_url, headers=headers)
+            if self._streams_context is None:
+                raise MCPConnectionError("Failed to create connection context")
+
+            # Use exit_stack to manage context managers properly
+            if method_name == "mcp":
+                read_stream, write_stream, _ = self.exit_stack.enter_context(self._streams_context)
+                streams = (read_stream, write_stream)
+            else:  # sse_client
+                streams = self.exit_stack.enter_context(self._streams_context)
+
+            self._session_context = ClientSession(*streams)
+            self._session = self.exit_stack.enter_context(self._session_context)
+            session = cast(ClientSession, self._session)
+            session.initialize()
+            return
+
+        except MCPAuthError:
+            if not self.authed:
+                raise
+            try:
+                auth(self.provider, self.server_url, self.authorization_code)
+            except Exception as e:
+                raise ValueError(f"Failed to authenticate: {e}")
+            self.token = self.provider.tokens()
+            if first_try:
+                return self.connect_server(client_factory, method_name, first_try=False)
+
+        except MCPConnectionError:
+            raise
+
+    def list_tools(self) -> list[Tool]:
+        """Connect to an MCP server running with SSE transport"""
+        # List available tools to verify connection
+        if not self._initialized or not self._session:
+            raise ValueError("Session not initialized.")
+        response = self._session.list_tools()
+        tools = response.tools
+        return tools
+
+    def invoke_tool(self, tool_name: str, tool_args: dict):
+        """Call a tool"""
+        if not self._initialized or not self._session:
+            raise ValueError("Session not initialized.")
+        return self._session.call_tool(tool_name, tool_args)
+
+    def cleanup(self):
+        """Clean up resources"""
+        try:
+            # ExitStack will handle proper cleanup of all managed context managers
+            self.exit_stack.close()
+            self._session = None
+            self._session_context = None
+            self._streams_context = None
+            self._initialized = False
+        except Exception as e:
+            logging.exception("Error during cleanup")
+            raise ValueError(f"Error during cleanup: {e}")

api/core/mcp/server/streamable_http.py

@@ -0,0 +1,224 @@
+import json
+import logging
+from collections.abc import Mapping
+from typing import Any, cast
+
+from configs import dify_config
+from controllers.web.passport import generate_session_id
+from core.app.app_config.entities import VariableEntity, VariableEntityType
+from core.app.entities.app_invoke_entities import InvokeFrom
+from core.app.features.rate_limiting.rate_limit import RateLimitGenerator
+from core.mcp import types
+from core.mcp.types import INTERNAL_ERROR, INVALID_PARAMS, METHOD_NOT_FOUND
+from core.mcp.utils import create_mcp_error_response
+from core.model_runtime.utils.encoders import jsonable_encoder
+from extensions.ext_database import db
+from models.model import App, AppMCPServer, AppMode, EndUser
+from services.app_generate_service import AppGenerateService
+
+"""
+Apply to MCP HTTP streamable server with stateless http
+"""
+logger = logging.getLogger(__name__)
+
+
+class MCPServerStreamableHTTPRequestHandler:
+    def __init__(
+        self, app: App, request: types.ClientRequest | types.ClientNotification, user_input_form: list[VariableEntity]
+    ):
+        self.app = app
+        self.request = request
+        mcp_server = db.session.query(AppMCPServer).filter(AppMCPServer.app_id == self.app.id).first()
+        if not mcp_server:
+            raise ValueError("MCP server not found")
+        self.mcp_server: AppMCPServer = mcp_server
+        self.end_user = self.retrieve_end_user()
+        self.user_input_form = user_input_form
+
+    @property
+    def request_type(self):
+        return type(self.request.root)
+
+    @property
+    def parameter_schema(self):
+        parameters, required = self._convert_input_form_to_parameters(self.user_input_form)
+        if self.app.mode in {AppMode.COMPLETION.value, AppMode.WORKFLOW.value}:
+            return {
+                "type": "object",
+                "properties": parameters,
+                "required": required,
+            }
+        return {
+            "type": "object",
+            "properties": {
+                "query": {"type": "string", "description": "User Input/Question content"},
+                **parameters,
+            },
+            "required": ["query", *required],
+        }
+
+    @property
+    def capabilities(self):
+        return types.ServerCapabilities(
+            tools=types.ToolsCapability(listChanged=False),
+        )
+
+    def response(self, response: types.Result | str):
+        if isinstance(response, str):
+            sse_content = f"event: ping\ndata: {response}\n\n".encode()
+            yield sse_content
+            return
+        json_response = types.JSONRPCResponse(
+            jsonrpc="2.0",
+            id=(self.request.root.model_extra or {}).get("id", 1),
+            result=response.model_dump(by_alias=True, mode="json", exclude_none=True),
+        )
+        json_data = json.dumps(jsonable_encoder(json_response))
+
+        sse_content = f"event: message\ndata: {json_data}\n\n".encode()
+
+        yield sse_content
+
+    def error_response(self, code: int, message: str, data=None):
+        request_id = (self.request.root.model_extra or {}).get("id", 1) or 1
+        return create_mcp_error_response(request_id, code, message, data)
+
+    def handle(self):
+        handle_map = {
+            types.InitializeRequest: self.initialize,
+            types.ListToolsRequest: self.list_tools,
+            types.CallToolRequest: self.invoke_tool,
+            types.InitializedNotification: self.handle_notification,
+        }
+        try:
+            if self.request_type in handle_map:
+                return self.response(handle_map[self.request_type]())
+            else:
+                return self.error_response(METHOD_NOT_FOUND, f"Method not found: {self.request_type}")
+        except ValueError as e:
+            logger.exception("Invalid params")
+            return self.error_response(INVALID_PARAMS, str(e))
+        except Exception as e:
+            logger.exception("Internal server error")
+            return self.error_response(INTERNAL_ERROR, f"Internal server error: {str(e)}")
+
+    def handle_notification(self):
+        return "ping"
+
+    def initialize(self):
+        request = cast(types.InitializeRequest, self.request.root)
+        client_info = request.params.clientInfo
+        clinet_name = f"{client_info.name}@{client_info.version}"
+        if not self.end_user:
+            end_user = EndUser(
+                tenant_id=self.app.tenant_id,
+                app_id=self.app.id,
+                type="mcp",
+                name=clinet_name,
+                session_id=generate_session_id(),
+                external_user_id=self.mcp_server.id,
+            )
+            db.session.add(end_user)
+            db.session.commit()
+        return types.InitializeResult(
+            protocolVersion=types.SERVER_LATEST_PROTOCOL_VERSION,
+            capabilities=self.capabilities,
+            serverInfo=types.Implementation(name="Dify", version=dify_config.project.version),
+            instructions=self.mcp_server.description,
+        )
+
+    def list_tools(self):
+        if not self.end_user:
+            raise ValueError("User not found")
+        return types.ListToolsResult(
+            tools=[
+                types.Tool(
+                    name=self.app.name,
+                    description=self.mcp_server.description,
+                    inputSchema=self.parameter_schema,
+                )
+            ],
+        )
+
+    def invoke_tool(self):
+        if not self.end_user:
+            raise ValueError("User not found")
+        request = cast(types.CallToolRequest, self.request.root)
+        args = request.params.arguments
+        if not args:
+            raise ValueError("No arguments provided")
+        if self.app.mode in {AppMode.WORKFLOW.value}:
+            args = {"inputs": args}
+        elif self.app.mode in {AppMode.COMPLETION.value}:
+            args = {"query": "", "inputs": args}
+        else:
+            args = {"query": args["query"], "inputs": {k: v for k, v in args.items() if k != "query"}}
+        response = AppGenerateService.generate(
+            self.app,
+            self.end_user,
+            args,
+            InvokeFrom.SERVICE_API,
+            streaming=self.app.mode == AppMode.AGENT_CHAT.value,
+        )
+        answer = ""
+        if isinstance(response, RateLimitGenerator):
+            for item in response.generator:
+                data = item
+                if isinstance(data, str) and data.startswith("data: "):
+                    try:
+                        json_str = data[6:].strip()
+                        parsed_data = json.loads(json_str)
+                        if parsed_data.get("event") == "agent_thought":
+                            answer += parsed_data.get("thought", "")
+                    except json.JSONDecodeError:
+                        continue
+        if isinstance(response, Mapping):
+            if self.app.mode in {
+                AppMode.ADVANCED_CHAT.value,
+                AppMode.COMPLETION.value,
+                AppMode.CHAT.value,
+                AppMode.AGENT_CHAT.value,
+            }:
+                answer = response["answer"]
+            elif self.app.mode in {AppMode.WORKFLOW.value}:
+                answer = json.dumps(response["data"]["outputs"], ensure_ascii=False)
+            else:
+                raise ValueError("Invalid app mode")
+            # Not support image yet
+        return types.CallToolResult(content=[types.TextContent(text=answer, type="text")])
+
+    def retrieve_end_user(self):
+        return (
+            db.session.query(EndUser)
+            .filter(EndUser.external_user_id == self.mcp_server.id, EndUser.type == "mcp")
+            .first()
+        )
+
+    def _convert_input_form_to_parameters(self, user_input_form: list[VariableEntity]):
+        parameters: dict[str, dict[str, Any]] = {}
+        required = []
+        for item in user_input_form:
+            parameters[item.variable] = {}
+            if item.type in (
+                VariableEntityType.FILE,
+                VariableEntityType.FILE_LIST,
+                VariableEntityType.EXTERNAL_DATA_TOOL,
+            ):
+                continue
+            if item.required:
+                required.append(item.variable)
+            # if the workflow republished, the parameters not changed
+            # we should not raise error here
+            try:
+                description = self.mcp_server.parameters_dict[item.variable]
+            except KeyError:
+                description = ""
+            parameters[item.variable]["description"] = description
+            if item.type in (VariableEntityType.TEXT_INPUT, VariableEntityType.PARAGRAPH):
+                parameters[item.variable]["type"] = "string"
+            elif item.type == VariableEntityType.SELECT:
+                parameters[item.variable]["type"] = "string"
+                parameters[item.variable]["enum"] = item.options
+            elif item.type == VariableEntityType.NUMBER:
+                parameters[item.variable]["type"] = "float"
+        return parameters, required

api/core/mcp/session/base_session.py

@@ -0,0 +1,397 @@
+import logging
+import queue
+from collections.abc import Callable
+from concurrent.futures import ThreadPoolExecutor
+from contextlib import ExitStack
+from datetime import timedelta
+from types import TracebackType
+from typing import Any, Generic, Self, TypeVar
+
+from httpx import HTTPStatusError
+from pydantic import BaseModel
+
+from core.mcp.error import MCPAuthError, MCPConnectionError
+from core.mcp.types import (
+    CancelledNotification,
+    ClientNotification,
+    ClientRequest,
+    ClientResult,
+    ErrorData,
+    JSONRPCError,
+    JSONRPCMessage,
+    JSONRPCNotification,
+    JSONRPCRequest,
+    JSONRPCResponse,
+    MessageMetadata,
+    RequestId,
+    RequestParams,
+    ServerMessageMetadata,
+    ServerNotification,
+    ServerRequest,
+    ServerResult,
+    SessionMessage,
+)
+
+SendRequestT = TypeVar("SendRequestT", ClientRequest, ServerRequest)
+SendResultT = TypeVar("SendResultT", ClientResult, ServerResult)
+SendNotificationT = TypeVar("SendNotificationT", ClientNotification, ServerNotification)
+ReceiveRequestT = TypeVar("ReceiveRequestT", ClientRequest, ServerRequest)
+ReceiveResultT = TypeVar("ReceiveResultT", bound=BaseModel)
+ReceiveNotificationT = TypeVar("ReceiveNotificationT", ClientNotification, ServerNotification)
+DEFAULT_RESPONSE_READ_TIMEOUT = 1.0
+
+
+class RequestResponder(Generic[ReceiveRequestT, SendResultT]):
+    """Handles responding to MCP requests and manages request lifecycle.
+
+    This class MUST be used as a context manager to ensure proper cleanup and
+    cancellation handling:
+
+    Example:
+        with request_responder as resp:
+            resp.respond(result)
+
+    The context manager ensures:
+    1. Proper cancellation scope setup and cleanup
+    2. Request completion tracking
+    3. Cleanup of in-flight requests
+    """
+
+    request: ReceiveRequestT
+    _session: Any
+    _on_complete: Callable[["RequestResponder[ReceiveRequestT, SendResultT]"], Any]
+
+    def __init__(
+        self,
+        request_id: RequestId,
+        request_meta: RequestParams.Meta | None,
+        request: ReceiveRequestT,
+        session: """BaseSession[
+            SendRequestT,
+            SendNotificationT,
+            SendResultT,
+            ReceiveRequestT,
+            ReceiveNotificationT
+        ]""",
+        on_complete: Callable[["RequestResponder[ReceiveRequestT, SendResultT]"], Any],
+    ) -> None:
+        self.request_id = request_id
+        self.request_meta = request_meta
+        self.request = request
+        self._session = session
+        self._completed = False
+        self._on_complete = on_complete
+        self._entered = False  # Track if we're in a context manager
+
+    def __enter__(self) -> "RequestResponder[ReceiveRequestT, SendResultT]":
+        """Enter the context manager, enabling request cancellation tracking."""
+        self._entered = True
+        return self
+
+    def __exit__(
+        self,
+        exc_type: type[BaseException] | None,
+        exc_val: BaseException | None,
+        exc_tb: TracebackType | None,
+    ) -> None:
+        """Exit the context manager, performing cleanup and notifying completion."""
+        try:
+            if self._completed:
+                self._on_complete(self)
+        finally:
+            self._entered = False
+
+    def respond(self, response: SendResultT | ErrorData) -> None:
+        """Send a response for this request.
+
+        Must be called within a context manager block.
+        Raises:
+            RuntimeError: If not used within a context manager
+            AssertionError: If request was already responded to
+        """
+        if not self._entered:
+            raise RuntimeError("RequestResponder must be used as a context manager")
+        assert not self._completed, "Request already responded to"
+
+        self._completed = True
+
+        self._session._send_response(request_id=self.request_id, response=response)
+
+    def cancel(self) -> None:
+        """Cancel this request and mark it as completed."""
+        if not self._entered:
+            raise RuntimeError("RequestResponder must be used as a context manager")
+
+        self._completed = True  # Mark as completed so it's removed from in_flight
+        # Send an error response to indicate cancellation
+        self._session._send_response(
+            request_id=self.request_id,
+            response=ErrorData(code=0, message="Request cancelled", data=None),
+        )
+
+
+class BaseSession(
+    Generic[
+        SendRequestT,
+        SendNotificationT,
+        SendResultT,
+        ReceiveRequestT,
+        ReceiveNotificationT,
+    ],
+):
+    """
+    Implements an MCP "session" on top of read/write streams, including features
+    like request/response linking, notifications, and progress.
+
+    This class is a context manager that automatically starts processing
+    messages when entered.
+    """
+
+    _response_streams: dict[RequestId, queue.Queue[JSONRPCResponse | JSONRPCError]]
+    _request_id: int
+    _in_flight: dict[RequestId, RequestResponder[ReceiveRequestT, SendResultT]]
+    _receive_request_type: type[ReceiveRequestT]
+    _receive_notification_type: type[ReceiveNotificationT]
+
+    def __init__(
+        self,
+        read_stream: queue.Queue,
+        write_stream: queue.Queue,
+        receive_request_type: type[ReceiveRequestT],
+        receive_notification_type: type[ReceiveNotificationT],
+        # If none, reading will never time out
+        read_timeout_seconds: timedelta | None = None,
+    ) -> None:
+        self._read_stream = read_stream
+        self._write_stream = write_stream
+        self._response_streams = {}
+        self._request_id = 0
+        self._receive_request_type = receive_request_type
+        self._receive_notification_type = receive_notification_type
+        self._session_read_timeout_seconds = read_timeout_seconds
+        self._in_flight = {}
+        self._exit_stack = ExitStack()
+
+    def __enter__(self) -> Self:
+        self._executor = ThreadPoolExecutor()
+        self._receiver_future = self._executor.submit(self._receive_loop)
+        return self
+
+    def check_receiver_status(self) -> None:
+        if self._receiver_future.done():
+            self._receiver_future.result()
+
+    def __exit__(
+        self, exc_type: type[BaseException] | None, exc_val: BaseException | None, exc_tb: TracebackType | None
+    ) -> None:
+        self._exit_stack.close()
+        self._read_stream.put(None)
+        self._write_stream.put(None)
+
+    def send_request(
+        self,
+        request: SendRequestT,
+        result_type: type[ReceiveResultT],
+        request_read_timeout_seconds: timedelta | None = None,
+        metadata: MessageMetadata = None,
+    ) -> ReceiveResultT:
+        """
+        Sends a request and wait for a response. Raises an McpError if the
+        response contains an error. If a request read timeout is provided, it
+        will take precedence over the session read timeout.
+
+        Do not use this method to emit notifications! Use send_notification()
+        instead.
+        """
+        self.check_receiver_status()
+
+        request_id = self._request_id
+        self._request_id = request_id + 1
+
+        response_queue: queue.Queue[JSONRPCResponse | JSONRPCError] = queue.Queue()
+        self._response_streams[request_id] = response_queue
+
+        try:
+            jsonrpc_request = JSONRPCRequest(
+                jsonrpc="2.0",
+                id=request_id,
+                **request.model_dump(by_alias=True, mode="json", exclude_none=True),
+            )
+
+            self._write_stream.put(SessionMessage(message=JSONRPCMessage(jsonrpc_request), metadata=metadata))
+            timeout = DEFAULT_RESPONSE_READ_TIMEOUT
+            if request_read_timeout_seconds is not None:
+                timeout = float(request_read_timeout_seconds.total_seconds())
+            elif self._session_read_timeout_seconds is not None:
+                timeout = float(self._session_read_timeout_seconds.total_seconds())
+            while True:
+                try:
+                    response_or_error = response_queue.get(timeout=timeout)
+                    break
+                except queue.Empty:
+                    self.check_receiver_status()
+                    continue
+
+            if response_or_error is None:
+                raise MCPConnectionError(
+                    ErrorData(
+                        code=500,
+                        message="No response received",
+                    )
+                )
+            elif isinstance(response_or_error, JSONRPCError):
+                if response_or_error.error.code == 401:
+                    raise MCPAuthError(
+                        ErrorData(code=response_or_error.error.code, message=response_or_error.error.message)
+                    )
+                else:
+                    raise MCPConnectionError(
+                        ErrorData(code=response_or_error.error.code, message=response_or_error.error.message)
+                    )
+            else:
+                return result_type.model_validate(response_or_error.result)
+
+        finally:
+            self._response_streams.pop(request_id, None)
+
+    def send_notification(
+        self,
+        notification: SendNotificationT,
+        related_request_id: RequestId | None = None,
+    ) -> None:
+        """
+        Emits a notification, which is a one-way message that does not expect
+        a response.
+        """
+        self.check_receiver_status()
+
+        # Some transport implementations may need to set the related_request_id
+        # to attribute to the notifications to the request that triggered them.
+        jsonrpc_notification = JSONRPCNotification(
+            jsonrpc="2.0",
+            **notification.model_dump(by_alias=True, mode="json", exclude_none=True),
+        )
+        session_message = SessionMessage(
+            message=JSONRPCMessage(jsonrpc_notification),
+            metadata=ServerMessageMetadata(related_request_id=related_request_id) if related_request_id else None,
+        )
+        self._write_stream.put(session_message)
+
+    def _send_response(self, request_id: RequestId, response: SendResultT | ErrorData) -> None:
+        if isinstance(response, ErrorData):
+            jsonrpc_error = JSONRPCError(jsonrpc="2.0", id=request_id, error=response)
+            session_message = SessionMessage(message=JSONRPCMessage(jsonrpc_error))
+            self._write_stream.put(session_message)
+        else:
+            jsonrpc_response = JSONRPCResponse(
+                jsonrpc="2.0",
+                id=request_id,
+                result=response.model_dump(by_alias=True, mode="json", exclude_none=True),
+            )
+            session_message = SessionMessage(message=JSONRPCMessage(jsonrpc_response))
+            self._write_stream.put(session_message)
+
+    def _receive_loop(self) -> None:
+        """
+        Main message processing loop.
+        In a real synchronous implementation, this would likely run in a separate thread.
+        """
+        while True:
+            try:
+                # Attempt to receive a message (this would be blocking in a synchronous context)
+                message = self._read_stream.get(timeout=DEFAULT_RESPONSE_READ_TIMEOUT)
+                if message is None:
+                    break
+                if isinstance(message, HTTPStatusError):
+                    response_queue = self._response_streams.get(self._request_id - 1)
+                    if response_queue is not None:
+                        response_queue.put(
+                            JSONRPCError(
+                                jsonrpc="2.0",
+                                id=self._request_id - 1,
+                                error=ErrorData(code=message.response.status_code, message=message.args[0]),
+                            )
+                        )
+                    else:
+                        self._handle_incoming(RuntimeError(f"Received response with an unknown request ID: {message}"))
+                elif isinstance(message, Exception):
+                    self._handle_incoming(message)
+                elif isinstance(message.message.root, JSONRPCRequest):
+                    validated_request = self._receive_request_type.model_validate(
+                        message.message.root.model_dump(by_alias=True, mode="json", exclude_none=True)
+                    )
+
+                    responder = RequestResponder(
+                        request_id=message.message.root.id,
+                        request_meta=validated_request.root.params.meta if validated_request.root.params else None,
+                        request=validated_request,
+                        session=self,
+                        on_complete=lambda r: self._in_flight.pop(r.request_id, None),
+                    )
+
+                    self._in_flight[responder.request_id] = responder
+                    self._received_request(responder)
+
+                    if not responder._completed:
+                        self._handle_incoming(responder)
+
+                elif isinstance(message.message.root, JSONRPCNotification):
+                    try:
+                        notification = self._receive_notification_type.model_validate(
+                            message.message.root.model_dump(by_alias=True, mode="json", exclude_none=True)
+                        )
+                        # Handle cancellation notifications
+                        if isinstance(notification.root, CancelledNotification):
+                            cancelled_id = notification.root.params.requestId
+                            if cancelled_id in self._in_flight:
+                                self._in_flight[cancelled_id].cancel()
+                        else:
+                            self._received_notification(notification)
+                            self._handle_incoming(notification)
+                    except Exception as e:
+                        # For other validation errors, log and continue
+                        logging.warning(f"Failed to validate notification: {e}. Message was: {message.message.root}")
+                else:  # Response or error
+                    response_queue = self._response_streams.get(message.message.root.id)
+                    if response_queue is not None:
+                        response_queue.put(message.message.root)
+                    else:
+                        self._handle_incoming(RuntimeError(f"Server Error: {message}"))
+            except queue.Empty:
+                continue
+            except Exception as e:
+                logging.exception("Error in message processing loop")
+                raise
+
+    def _received_request(self, responder: RequestResponder[ReceiveRequestT, SendResultT]) -> None:
+        """
+        Can be overridden by subclasses to handle a request without needing to
+        listen on the message stream.
+
+        If the request is responded to within this method, it will not be
+        forwarded on to the message stream.
+        """
+        pass
+
+    def _received_notification(self, notification: ReceiveNotificationT) -> None:
+        """
+        Can be overridden by subclasses to handle a notification without needing
+        to listen on the message stream.
+        """
+        pass
+
+    def send_progress_notification(
+        self, progress_token: str | int, progress: float, total: float | None = None
+    ) -> None:
+        """
+        Sends a progress notification for a request that is currently being
+        processed.
+        """
+        pass
+
+    def _handle_incoming(
+        self,
+        req: RequestResponder[ReceiveRequestT, SendResultT] | ReceiveNotificationT | Exception,
+    ) -> None:
+        """A generic handler for incoming messages. Overwritten by subclasses."""
+        pass

api/core/mcp/session/client_session.py

@@ -0,0 +1,365 @@
+from datetime import timedelta
+from typing import Any, Protocol
+
+from pydantic import AnyUrl, TypeAdapter
+
+from configs import dify_config
+from core.mcp import types
+from core.mcp.entities import SUPPORTED_PROTOCOL_VERSIONS, RequestContext
+from core.mcp.session.base_session import BaseSession, RequestResponder
+
+DEFAULT_CLIENT_INFO = types.Implementation(name="Dify", version=dify_config.project.version)
+
+
+class SamplingFnT(Protocol):
+    def __call__(
+        self,
+        context: RequestContext["ClientSession", Any],
+        params: types.CreateMessageRequestParams,
+    ) -> types.CreateMessageResult | types.ErrorData: ...
+
+
+class ListRootsFnT(Protocol):
+    def __call__(self, context: RequestContext["ClientSession", Any]) -> types.ListRootsResult | types.ErrorData: ...
+
+
+class LoggingFnT(Protocol):
+    def __call__(
+        self,
+        params: types.LoggingMessageNotificationParams,
+    ) -> None: ...
+
+
+class MessageHandlerFnT(Protocol):
+    def __call__(
+        self,
+        message: RequestResponder[types.ServerRequest, types.ClientResult] | types.ServerNotification | Exception,
+    ) -> None: ...
+
+
+def _default_message_handler(
+    message: RequestResponder[types.ServerRequest, types.ClientResult] | types.ServerNotification | Exception,
+) -> None:
+    if isinstance(message, Exception):
+        raise ValueError(str(message))
+    elif isinstance(message, (types.ServerNotification | RequestResponder)):
+        pass
+
+
+def _default_sampling_callback(
+    context: RequestContext["ClientSession", Any],
+    params: types.CreateMessageRequestParams,
+) -> types.CreateMessageResult | types.ErrorData:
+    return types.ErrorData(
+        code=types.INVALID_REQUEST,
+        message="Sampling not supported",
+    )
+
+
+def _default_list_roots_callback(
+    context: RequestContext["ClientSession", Any],
+) -> types.ListRootsResult | types.ErrorData:
+    return types.ErrorData(
+        code=types.INVALID_REQUEST,
+        message="List roots not supported",
+    )
+
+
+def _default_logging_callback(
+    params: types.LoggingMessageNotificationParams,
+) -> None:
+    pass
+
+
+ClientResponse: TypeAdapter[types.ClientResult | types.ErrorData] = TypeAdapter(types.ClientResult | types.ErrorData)
+
+
+class ClientSession(
+    BaseSession[
+        types.ClientRequest,
+        types.ClientNotification,
+        types.ClientResult,
+        types.ServerRequest,
+        types.ServerNotification,
+    ]
+):
+    def __init__(
+        self,
+        read_stream,
+        write_stream,
+        read_timeout_seconds: timedelta | None = None,
+        sampling_callback: SamplingFnT | None = None,
+        list_roots_callback: ListRootsFnT | None = None,
+        logging_callback: LoggingFnT | None = None,
+        message_handler: MessageHandlerFnT | None = None,
+        client_info: types.Implementation | None = None,
+    ) -> None:
+        super().__init__(
+            read_stream,
+            write_stream,
+            types.ServerRequest,
+            types.ServerNotification,
+            read_timeout_seconds=read_timeout_seconds,
+        )
+        self._client_info = client_info or DEFAULT_CLIENT_INFO
+        self._sampling_callback = sampling_callback or _default_sampling_callback
+        self._list_roots_callback = list_roots_callback or _default_list_roots_callback
+        self._logging_callback = logging_callback or _default_logging_callback
+        self._message_handler = message_handler or _default_message_handler
+
+    def initialize(self) -> types.InitializeResult:
+        sampling = types.SamplingCapability()
+        roots = types.RootsCapability(
+            # TODO: Should this be based on whether we
+            # _will_ send notifications, or only whether
+            # they're supported?
+            listChanged=True,
+        )
+
+        result = self.send_request(
+            types.ClientRequest(
+                types.InitializeRequest(
+                    method="initialize",
+                    params=types.InitializeRequestParams(
+                        protocolVersion=types.LATEST_PROTOCOL_VERSION,
+                        capabilities=types.ClientCapabilities(
+                            sampling=sampling,
+                            experimental=None,
+                            roots=roots,
+                        ),
+                        clientInfo=self._client_info,
+                    ),
+                )
+            ),
+            types.InitializeResult,
+        )
+
+        if result.protocolVersion not in SUPPORTED_PROTOCOL_VERSIONS:
+            raise RuntimeError(f"Unsupported protocol version from the server: {result.protocolVersion}")
+
+        self.send_notification(
+            types.ClientNotification(types.InitializedNotification(method="notifications/initialized"))
+        )
+
+        return result
+
+    def send_ping(self) -> types.EmptyResult:
+        """Send a ping request."""
+        return self.send_request(
+            types.ClientRequest(
+                types.PingRequest(
+                    method="ping",
+                )
+            ),
+            types.EmptyResult,
+        )
+
+    def send_progress_notification(
+        self, progress_token: str | int, progress: float, total: float | None = None
+    ) -> None:
+        """Send a progress notification."""
+        self.send_notification(
+            types.ClientNotification(
+                types.ProgressNotification(
+                    method="notifications/progress",
+                    params=types.ProgressNotificationParams(
+                        progressToken=progress_token,
+                        progress=progress,
+                        total=total,
+                    ),
+                ),
+            )
+        )
+
+    def set_logging_level(self, level: types.LoggingLevel) -> types.EmptyResult:
+        """Send a logging/setLevel request."""
+        return self.send_request(
+            types.ClientRequest(
+                types.SetLevelRequest(
+                    method="logging/setLevel",
+                    params=types.SetLevelRequestParams(level=level),
+                )
+            ),
+            types.EmptyResult,
+        )
+
+    def list_resources(self) -> types.ListResourcesResult:
+        """Send a resources/list request."""
+        return self.send_request(
+            types.ClientRequest(
+                types.ListResourcesRequest(
+                    method="resources/list",
+                )
+            ),
+            types.ListResourcesResult,
+        )
+
+    def list_resource_templates(self) -> types.ListResourceTemplatesResult:
+        """Send a resources/templates/list request."""
+        return self.send_request(
+            types.ClientRequest(
+                types.ListResourceTemplatesRequest(
+                    method="resources/templates/list",
+                )
+            ),
+            types.ListResourceTemplatesResult,
+        )
+
+    def read_resource(self, uri: AnyUrl) -> types.ReadResourceResult:
+        """Send a resources/read request."""
+        return self.send_request(
+            types.ClientRequest(
+                types.ReadResourceRequest(
+                    method="resources/read",
+                    params=types.ReadResourceRequestParams(uri=uri),
+                )
+            ),
+            types.ReadResourceResult,
+        )
+
+    def subscribe_resource(self, uri: AnyUrl) -> types.EmptyResult:
+        """Send a resources/subscribe request."""
+        return self.send_request(
+            types.ClientRequest(
+                types.SubscribeRequest(
+                    method="resources/subscribe",
+                    params=types.SubscribeRequestParams(uri=uri),
+                )
+            ),
+            types.EmptyResult,
+        )
+
+    def unsubscribe_resource(self, uri: AnyUrl) -> types.EmptyResult:
+        """Send a resources/unsubscribe request."""
+        return self.send_request(
+            types.ClientRequest(
+                types.UnsubscribeRequest(
+                    method="resources/unsubscribe",
+                    params=types.UnsubscribeRequestParams(uri=uri),
+                )
+            ),
+            types.EmptyResult,
+        )
+
+    def call_tool(
+        self,
+        name: str,
+        arguments: dict[str, Any] | None = None,
+        read_timeout_seconds: timedelta | None = None,
+    ) -> types.CallToolResult:
+        """Send a tools/call request."""
+
+        return self.send_request(
+            types.ClientRequest(
+                types.CallToolRequest(
+                    method="tools/call",
+                    params=types.CallToolRequestParams(name=name, arguments=arguments),
+                )
+            ),
+            types.CallToolResult,
+            request_read_timeout_seconds=read_timeout_seconds,
+        )
+
+    def list_prompts(self) -> types.ListPromptsResult:
+        """Send a prompts/list request."""
+        return self.send_request(
+            types.ClientRequest(
+                types.ListPromptsRequest(
+                    method="prompts/list",
+                )
+            ),
+            types.ListPromptsResult,
+        )
+
+    def get_prompt(self, name: str, arguments: dict[str, str] | None = None) -> types.GetPromptResult:
+        """Send a prompts/get request."""
+        return self.send_request(
+            types.ClientRequest(
+                types.GetPromptRequest(
+                    method="prompts/get",
+                    params=types.GetPromptRequestParams(name=name, arguments=arguments),
+                )
+            ),
+            types.GetPromptResult,
+        )
+
+    def complete(
+        self,
+        ref: types.ResourceReference | types.PromptReference,
+        argument: dict[str, str],
+    ) -> types.CompleteResult:
+        """Send a completion/complete request."""
+        return self.send_request(
+            types.ClientRequest(
+                types.CompleteRequest(
+                    method="completion/complete",
+                    params=types.CompleteRequestParams(
+                        ref=ref,
+                        argument=types.CompletionArgument(**argument),
+                    ),
+                )
+            ),
+            types.CompleteResult,
+        )
+
+    def list_tools(self) -> types.ListToolsResult:
+        """Send a tools/list request."""
+        return self.send_request(
+            types.ClientRequest(
+                types.ListToolsRequest(
+                    method="tools/list",
+                )
+            ),
+            types.ListToolsResult,
+        )
+
+    def send_roots_list_changed(self) -> None:
+        """Send a roots/list_changed notification."""
+        self.send_notification(
+            types.ClientNotification(
+                types.RootsListChangedNotification(
+                    method="notifications/roots/list_changed",
+                )
+            )
+        )
+
+    def _received_request(self, responder: RequestResponder[types.ServerRequest, types.ClientResult]) -> None:
+        ctx = RequestContext[ClientSession, Any](
+            request_id=responder.request_id,
+            meta=responder.request_meta,
+            session=self,
+            lifespan_context=None,
+        )
+
+        match responder.request.root:
+            case types.CreateMessageRequest(params=params):
+                with responder:
+                    response = self._sampling_callback(ctx, params)
+                    client_response = ClientResponse.validate_python(response)
+                    responder.respond(client_response)
+
+            case types.ListRootsRequest():
+                with responder:
+                    list_roots_response = self._list_roots_callback(ctx)
+                    client_response = ClientResponse.validate_python(list_roots_response)
+                    responder.respond(client_response)
+
+            case types.PingRequest():
+                with responder:
+                    return responder.respond(types.ClientResult(root=types.EmptyResult()))
+
+    def _handle_incoming(
+        self,
+        req: RequestResponder[types.ServerRequest, types.ClientResult] | types.ServerNotification | Exception,
+    ) -> None:
+        """Handle incoming messages by forwarding to the message handler."""
+        self._message_handler(req)
+
+    def _received_notification(self, notification: types.ServerNotification) -> None:
+        """Handle notifications from the server."""
+        # Process specific notification types
+        match notification.root:
+            case types.LoggingMessageNotification(params=params):
+                self._logging_callback(params)
+            case _:
+                pass

api/core/mcp/utils.py

@@ -0,0 +1,114 @@
+import json
+
+import httpx
+
+from configs import dify_config
+from core.mcp.types import ErrorData, JSONRPCError
+from core.model_runtime.utils.encoders import jsonable_encoder
+
+HTTP_REQUEST_NODE_SSL_VERIFY = dify_config.HTTP_REQUEST_NODE_SSL_VERIFY
+
+STATUS_FORCELIST = [429, 500, 502, 503, 504]
+
+
+def create_ssrf_proxy_mcp_http_client(
+    headers: dict[str, str] | None = None,
+    timeout: httpx.Timeout | None = None,
+) -> httpx.Client:
+    """Create an HTTPX client with SSRF proxy configuration for MCP connections.
+
+    Args:
+        headers: Optional headers to include in the client
+        timeout: Optional timeout configuration
+
+    Returns:
+        Configured httpx.Client with proxy settings
+    """
+    if dify_config.SSRF_PROXY_ALL_URL:
+        return httpx.Client(
+            verify=HTTP_REQUEST_NODE_SSL_VERIFY,
+            headers=headers or {},
+            timeout=timeout,
+            follow_redirects=True,
+            proxy=dify_config.SSRF_PROXY_ALL_URL,
+        )
+    elif dify_config.SSRF_PROXY_HTTP_URL and dify_config.SSRF_PROXY_HTTPS_URL:
+        proxy_mounts = {
+            "http://": httpx.HTTPTransport(proxy=dify_config.SSRF_PROXY_HTTP_URL, verify=HTTP_REQUEST_NODE_SSL_VERIFY),
+            "https://": httpx.HTTPTransport(
+                proxy=dify_config.SSRF_PROXY_HTTPS_URL, verify=HTTP_REQUEST_NODE_SSL_VERIFY
+            ),
+        }
+        return httpx.Client(
+            verify=HTTP_REQUEST_NODE_SSL_VERIFY,
+            headers=headers or {},
+            timeout=timeout,
+            follow_redirects=True,
+            mounts=proxy_mounts,
+        )
+    else:
+        return httpx.Client(
+            verify=HTTP_REQUEST_NODE_SSL_VERIFY,
+            headers=headers or {},
+            timeout=timeout,
+            follow_redirects=True,
+        )
+
+
+def ssrf_proxy_sse_connect(url, **kwargs):
+    """Connect to SSE endpoint with SSRF proxy protection.
+
+    This function creates an SSE connection using the configured proxy settings
+    to prevent SSRF attacks when connecting to external endpoints.
+
+    Args:
+        url: The SSE endpoint URL
+        **kwargs: Additional arguments passed to the SSE connection
+
+    Returns:
+        EventSource object for SSE streaming
+    """
+    from httpx_sse import connect_sse
+
+    # Extract client if provided, otherwise create one
+    client = kwargs.pop("client", None)
+    if client is None:
+        # Create client with SSRF proxy configuration
+        timeout = kwargs.pop(
+            "timeout",
+            httpx.Timeout(
+                timeout=dify_config.SSRF_DEFAULT_TIME_OUT,
+                connect=dify_config.SSRF_DEFAULT_CONNECT_TIME_OUT,
+                read=dify_config.SSRF_DEFAULT_READ_TIME_OUT,
+                write=dify_config.SSRF_DEFAULT_WRITE_TIME_OUT,
+            ),
+        )
+        headers = kwargs.pop("headers", {})
+        client = create_ssrf_proxy_mcp_http_client(headers=headers, timeout=timeout)
+        client_provided = False
+    else:
+        client_provided = True
+
+    # Extract method if provided, default to GET
+    method = kwargs.pop("method", "GET")
+
+    try:
+        return connect_sse(client, method, url, **kwargs)
+    except Exception:
+        # If we created the client, we need to clean it up on error
+        if not client_provided:
+            client.close()
+        raise
+
+
+def create_mcp_error_response(request_id: int | str | None, code: int, message: str, data=None):
+    """Create MCP error response"""
+    error_data = ErrorData(code=code, message=message, data=data)
+    json_response = JSONRPCError(
+        jsonrpc="2.0",
+        id=request_id or 1,
+        error=error_data,
+    )
+    json_data = json.dumps(jsonable_encoder(json_response))
+    sse_content = f"event: message\ndata: {json_data}\n\n".encode()
+    yield sse_content

api/core/plugin/entities/parameters.py

@@ -43,6 +43,19 @@ class PluginParameterType(enum.StrEnum):
     # deprecated, should not use.
     SYSTEM_FILES = CommonParameterType.SYSTEM_FILES.value
 
+    # MCP object and array type parameters
+    ARRAY = CommonParameterType.ARRAY.value
+    OBJECT = CommonParameterType.OBJECT.value
+
+
+class MCPServerParameterType(enum.StrEnum):
+    """
+    MCP server got complex parameter types
+    """
+
+    ARRAY = "array"
+    OBJECT = "object"
+
 
 class PluginParameterAutoGenerate(BaseModel):
     class Type(enum.StrEnum):
@@ -138,6 +151,34 @@ def cast_parameter_value(typ: enum.StrEnum, value: Any, /):
                 if value and not isinstance(value, list):
                     raise ValueError("The tools selector must be a list.")
                 return value
+            case PluginParameterType.ARRAY:
+                if not isinstance(value, list):
+                    # Try to parse JSON string for arrays
+                    if isinstance(value, str):
+                        try:
+                            import json
+
+                            parsed_value = json.loads(value)
+                            if isinstance(parsed_value, list):
+                                return parsed_value
+                        except (json.JSONDecodeError, ValueError):
+                            pass
+                    return [value]
+                return value
+            case PluginParameterType.OBJECT:
+                if not isinstance(value, dict):
+                    # Try to parse JSON string for objects
+                    if isinstance(value, str):
+                        try:
+                            import json
+
+                            parsed_value = json.loads(value)
+                            if isinstance(parsed_value, dict):
+                                return parsed_value
+                        except (json.JSONDecodeError, ValueError):
+                            pass
+                    return {}
+                return value
             case _:
                 return str(value)
     except ValueError:

api/core/plugin/entities/plugin.py

@@ -72,6 +72,7 @@ class PluginDeclaration(BaseModel):
 
     class Meta(BaseModel):
         minimum_dify_version: Optional[str] = Field(default=None, pattern=r"^\d{1,4}(\.\d{1,4}){1,3}(-\w{1,16})?$")
+        version: Optional[str] = Field(default=None)
 
     version: str = Field(..., pattern=r"^\d{1,4}(\.\d{1,4}){1,3}(-\w{1,16})?$")
     author: Optional[str] = Field(..., pattern=r"^[a-zA-Z0-9_-]{1,64}$")

api/core/plugin/entities/plugin_daemon.py

@@ -53,6 +53,7 @@ class PluginAgentProviderEntity(BaseModel):
     plugin_unique_identifier: str
     plugin_id: str
     declaration: AgentProviderEntityWithPlugin
+    meta: PluginDeclaration.Meta
 
 
 class PluginBasicBooleanResponse(BaseModel):

api/core/plugin/entities/request.py

@@ -32,7 +32,7 @@ class RequestInvokeTool(BaseModel):
     Request to invoke a tool
     """
 
-    tool_type: Literal["builtin", "workflow", "api"]
+    tool_type: Literal["builtin", "workflow", "api", "mcp"]
     provider: str
     tool: str
     tool_parameters: dict

api/core/tools/entities/api_entities.py

@@ -1,4 +1,5 @@
-from typing import Literal, Optional
+from datetime import datetime
+from typing import Any, Literal, Optional
 
 from pydantic import BaseModel, Field, field_validator
 
@@ -18,7 +19,7 @@ class ToolApiEntity(BaseModel):
     output_schema: Optional[dict] = None
 
 
-ToolProviderTypeApiLiteral = Optional[Literal["builtin", "api", "workflow"]]
+ToolProviderTypeApiLiteral = Optional[Literal["builtin", "api", "workflow", "mcp"]]
 
 
 class ToolProviderApiEntity(BaseModel):
@@ -37,6 +38,10 @@ class ToolProviderApiEntity(BaseModel):
     plugin_unique_identifier: Optional[str] = Field(default="", description="The unique identifier of the tool")
     tools: list[ToolApiEntity] = Field(default_factory=list)
     labels: list[str] = Field(default_factory=list)
+    # MCP
+    server_url: Optional[str] = Field(default="", description="The server url of the tool")
+    updated_at: int = Field(default_factory=lambda: int(datetime.now().timestamp()))
+    server_identifier: Optional[str] = Field(default="", description="The server identifier of the MCP tool")
 
     @field_validator("tools", mode="before")
     @classmethod
@@ -52,8 +57,13 @@ class ToolProviderApiEntity(BaseModel):
                 for parameter in tool.get("parameters"):
                     if parameter.get("type") == ToolParameter.ToolParameterType.SYSTEM_FILES.value:
                         parameter["type"] = "files"
+                    if parameter.get("input_schema") is None:
+                        parameter.pop("input_schema", None)
         # -------------
-
+        optional_fields = self.optional_field("server_url", self.server_url)
+        if self.type == ToolProviderType.MCP.value:
+            optional_fields.update(self.optional_field("updated_at", self.updated_at))
+            optional_fields.update(self.optional_field("server_identifier", self.server_identifier))
         return {
             "id": self.id,
             "author": self.author,
@@ -69,4 +79,9 @@ class ToolProviderApiEntity(BaseModel):
             "allow_delete": self.allow_delete,
             "tools": tools,
             "labels": self.labels,
+            **optional_fields,
         }
+
+    def optional_field(self, key: str, value: Any) -> dict:
+        """Return dict with key-value if value is truthy, empty dict otherwise."""
+        return {key: value} if value else {}

api/core/tools/entities/tool_entities.py

@@ -8,6 +8,7 @@ from pydantic import BaseModel, ConfigDict, Field, ValidationInfo, field_seriali
 
 from core.entities.provider_entities import ProviderConfig
 from core.plugin.entities.parameters import (
+    MCPServerParameterType,
     PluginParameter,
     PluginParameterOption,
     PluginParameterType,
@@ -49,6 +50,7 @@ class ToolProviderType(enum.StrEnum):
     API = "api"
     APP = "app"
     DATASET_RETRIEVAL = "dataset-retrieval"
+    MCP = "mcp"
 
     @classmethod
     def value_of(cls, value: str) -> "ToolProviderType":
@@ -242,6 +244,10 @@ class ToolParameter(PluginParameter):
         MODEL_SELECTOR = PluginParameterType.MODEL_SELECTOR.value
         DYNAMIC_SELECT = PluginParameterType.DYNAMIC_SELECT.value
 
+        # MCP object and array type parameters
+        ARRAY = MCPServerParameterType.ARRAY.value
+        OBJECT = MCPServerParameterType.OBJECT.value
+
         # deprecated, should not use.
         SYSTEM_FILES = PluginParameterType.SYSTEM_FILES.value
 
@@ -260,6 +266,8 @@ class ToolParameter(PluginParameter):
     human_description: Optional[I18nObject] = Field(default=None, description="The description presented to the user")
     form: ToolParameterForm = Field(..., description="The form of the parameter, schema/form/llm")
     llm_description: Optional[str] = None
+    # MCP object and array type parameters use this field to store the schema
+    input_schema: Optional[dict] = None
 
     @classmethod
     def get_simple_instance(

api/core/tools/mcp_tool/provider.py

@@ -0,0 +1,130 @@
+import json
+from typing import Any
+
+from core.mcp.types import Tool as RemoteMCPTool
+from core.tools.__base.tool_provider import ToolProviderController
+from core.tools.__base.tool_runtime import ToolRuntime
+from core.tools.entities.common_entities import I18nObject
+from core.tools.entities.tool_entities import (
+    ToolDescription,
+    ToolEntity,
+    ToolIdentity,
+    ToolProviderEntityWithPlugin,
+    ToolProviderIdentity,
+    ToolProviderType,
+)
+from core.tools.mcp_tool.tool import MCPTool
+from models.tools import MCPToolProvider
+from services.tools.tools_transform_service import ToolTransformService
+
+
+class MCPToolProviderController(ToolProviderController):
+    provider_id: str
+    entity: ToolProviderEntityWithPlugin
+
+    def __init__(self, entity: ToolProviderEntityWithPlugin, provider_id: str, tenant_id: str, server_url: str) -> None:
+        super().__init__(entity)
+        self.entity = entity
+        self.tenant_id = tenant_id
+        self.provider_id = provider_id
+        self.server_url = server_url
+
+    @property
+    def provider_type(self) -> ToolProviderType:
+        """
+        returns the type of the provider
+
+        :return: type of the provider
+        """
+        return ToolProviderType.MCP
+
+    @classmethod
+    def _from_db(cls, db_provider: MCPToolProvider) -> "MCPToolProviderController":
+        """
+        from db provider
+        """
+        tools = []
+        tools_data = json.loads(db_provider.tools)
+        remote_mcp_tools = [RemoteMCPTool(**tool) for tool in tools_data]
+        user = db_provider.load_user()
+        tools = [
+            ToolEntity(
+                identity=ToolIdentity(
+                    author=user.name if user else "Anonymous",
+                    name=remote_mcp_tool.name,
+                    label=I18nObject(en_US=remote_mcp_tool.name, zh_Hans=remote_mcp_tool.name),
+                    provider=db_provider.server_identifier,
+                    icon=db_provider.icon,
+                ),
+                parameters=ToolTransformService.convert_mcp_schema_to_parameter(remote_mcp_tool.inputSchema),
+                description=ToolDescription(
+                    human=I18nObject(
+                        en_US=remote_mcp_tool.description or "", zh_Hans=remote_mcp_tool.description or ""
+                    ),
+                    llm=remote_mcp_tool.description or "",
+                ),
+                output_schema=None,
+                has_runtime_parameters=len(remote_mcp_tool.inputSchema) > 0,
+            )
+            for remote_mcp_tool in remote_mcp_tools
+        ]
+
+        return cls(
+            entity=ToolProviderEntityWithPlugin(
+                identity=ToolProviderIdentity(
+                    author=user.name if user else "Anonymous",
+                    name=db_provider.name,
+                    label=I18nObject(en_US=db_provider.name, zh_Hans=db_provider.name),
+                    description=I18nObject(en_US="", zh_Hans=""),
+                    icon=db_provider.icon,
+                ),
+                plugin_id=None,
+                credentials_schema=[],
+                tools=tools,
+            ),
+            provider_id=db_provider.server_identifier or "",
+            tenant_id=db_provider.tenant_id or "",
+            server_url=db_provider.decrypted_server_url,
+        )
+
+    def _validate_credentials(self, user_id: str, credentials: dict[str, Any]) -> None:
+        """
+        validate the credentials of the provider
+        """
+        pass
+
+    def get_tool(self, tool_name: str) -> MCPTool:  # type: ignore
+        """
+        return tool with given name
+        """
+        tool_entity = next(
+            (tool_entity for tool_entity in self.entity.tools if tool_entity.identity.name == tool_name), None
+        )
+
+        if not tool_entity:
+            raise ValueError(f"Tool with name {tool_name} not found")
+
+        return MCPTool(
+            entity=tool_entity,
+            runtime=ToolRuntime(tenant_id=self.tenant_id),
+            tenant_id=self.tenant_id,
+            icon=self.entity.identity.icon,
+            server_url=self.server_url,
+            provider_id=self.provider_id,
+        )
+
+    def get_tools(self) -> list[MCPTool]:  # type: ignore
+        """
+        get all tools
+        """
+        return [
+            MCPTool(
+                entity=tool_entity,
+                runtime=ToolRuntime(tenant_id=self.tenant_id),
+                tenant_id=self.tenant_id,
+                icon=self.entity.identity.icon,
+                server_url=self.server_url,
+                provider_id=self.provider_id,
+            )
+            for tool_entity in self.entity.tools
+        ]

api/core/tools/mcp_tool/tool.py

@@ -0,0 +1,92 @@
+import base64
+import json
+from collections.abc import Generator
+from typing import Any, Optional
+
+from core.mcp.error import MCPAuthError, MCPConnectionError
+from core.mcp.mcp_client import MCPClient
+from core.mcp.types import ImageContent, TextContent
+from core.tools.__base.tool import Tool
+from core.tools.__base.tool_runtime import ToolRuntime
+from core.tools.entities.tool_entities import ToolEntity, ToolInvokeMessage, ToolParameter, ToolProviderType
+
+
+class MCPTool(Tool):
+    tenant_id: str
+    icon: str
+    runtime_parameters: Optional[list[ToolParameter]]
+    server_url: str
+    provider_id: str
+
+    def __init__(
+        self, entity: ToolEntity, runtime: ToolRuntime, tenant_id: str, icon: str, server_url: str, provider_id: str
+    ) -> None:
+        super().__init__(entity, runtime)
+        self.tenant_id = tenant_id
+        self.icon = icon
+        self.runtime_parameters = None
+        self.server_url = server_url
+        self.provider_id = provider_id
+
+    def tool_provider_type(self) -> ToolProviderType:
+        return ToolProviderType.MCP
+
+    def _invoke(
+        self,
+        user_id: str,
+        tool_parameters: dict[str, Any],
+        conversation_id: Optional[str] = None,
+        app_id: Optional[str] = None,
+        message_id: Optional[str] = None,
+    ) -> Generator[ToolInvokeMessage, None, None]:
+        from core.tools.errors import ToolInvokeError
+
+        try:
+            with MCPClient(self.server_url, self.provider_id, self.tenant_id, authed=True) as mcp_client:
+                tool_parameters = self._handle_none_parameter(tool_parameters)
+                result = mcp_client.invoke_tool(tool_name=self.entity.identity.name, tool_args=tool_parameters)
+        except MCPAuthError as e:
+            raise ToolInvokeError("Please auth the tool first") from e
+        except MCPConnectionError as e:
+            raise ToolInvokeError(f"Failed to connect to MCP server: {e}") from e
+        except Exception as e:
+            raise ToolInvokeError(f"Failed to invoke tool: {e}") from e
+
+        for content in result.content:
+            if isinstance(content, TextContent):
+                try:
+                    content_json = json.loads(content.text)
+                    if isinstance(content_json, dict):
+                        yield self.create_json_message(content_json)
+                    elif isinstance(content_json, list):
+                        for item in content_json:
+                            yield self.create_json_message(item)
+                    else:
+                        yield self.create_text_message(content.text)
+                except json.JSONDecodeError:
+                    yield self.create_text_message(content.text)
+
+            elif isinstance(content, ImageContent):
+                yield self.create_blob_message(
+                    blob=base64.b64decode(content.data), meta={"mime_type": content.mimeType}
+                )
+
+    def fork_tool_runtime(self, runtime: ToolRuntime) -> "MCPTool":
+        return MCPTool(
+            entity=self.entity,
+            runtime=runtime,
+            tenant_id=self.tenant_id,
+            icon=self.icon,
+            server_url=self.server_url,
+            provider_id=self.provider_id,
+        )
+
+    def _handle_none_parameter(self, parameter: dict[str, Any]) -> dict[str, Any]:
+        """
+        in mcp tool invoke, if the parameter is empty, it will be set to None
+        """
+        return {
+            key: value
+            for key, value in parameter.items()
+            if value is not None and not (isinstance(value, str) and value.strip() == "")
+        }

api/core/tools/tool_manager.py

@@ -4,7 +4,7 @@ import mimetypes
 from collections.abc import Generator
 from os import listdir, path
 from threading import Lock
-from typing import TYPE_CHECKING, Any, Union, cast
+from typing import TYPE_CHECKING, Any, Literal, Optional, Union, cast
 
 from yarl import URL
 
@@ -13,9 +13,13 @@ from core.plugin.entities.plugin import ToolProviderID
 from core.plugin.impl.tool import PluginToolManager
 from core.tools.__base.tool_provider import ToolProviderController
 from core.tools.__base.tool_runtime import ToolRuntime
+from core.tools.mcp_tool.provider import MCPToolProviderController
+from core.tools.mcp_tool.tool import MCPTool
 from core.tools.plugin_tool.provider import PluginToolProviderController
 from core.tools.plugin_tool.tool import PluginTool
 from core.tools.workflow_as_tool.provider import WorkflowToolProviderController
+from core.workflow.entities.variable_pool import VariablePool
+from services.tools.mcp_tools_mange_service import MCPToolManageService
 
 if TYPE_CHECKING:
     from core.workflow.nodes.tool.entities import ToolEntity
@@ -49,7 +53,7 @@ from core.tools.utils.configuration import (
 )
 from core.tools.workflow_as_tool.tool import WorkflowTool
 from extensions.ext_database import db
-from models.tools import ApiToolProvider, BuiltinToolProvider, WorkflowToolProvider
+from models.tools import ApiToolProvider, BuiltinToolProvider, MCPToolProvider, WorkflowToolProvider
 from services.tools.tools_transform_service import ToolTransformService
 
 logger = logging.getLogger(__name__)
@@ -156,7 +160,7 @@ class ToolManager:
         tenant_id: str,
         invoke_from: InvokeFrom = InvokeFrom.DEBUGGER,
         tool_invoke_from: ToolInvokeFrom = ToolInvokeFrom.AGENT,
-    ) -> Union[BuiltinTool, PluginTool, ApiTool, WorkflowTool]:
+    ) -> Union[BuiltinTool, PluginTool, ApiTool, WorkflowTool, MCPTool]:
         """
         get the tool runtime
 
@@ -292,6 +296,8 @@ class ToolManager:
             raise NotImplementedError("app provider not implemented")
         elif provider_type == ToolProviderType.PLUGIN:
             return cls.get_plugin_provider(provider_id, tenant_id).get_tool(tool_name)
+        elif provider_type == ToolProviderType.MCP:
+            return cls.get_mcp_provider_controller(tenant_id, provider_id).get_tool(tool_name)
         else:
             raise ToolProviderNotFoundError(f"provider type {provider_type.value} not found")
 
@@ -302,6 +308,7 @@ class ToolManager:
         app_id: str,
         agent_tool: AgentToolEntity,
         invoke_from: InvokeFrom = InvokeFrom.DEBUGGER,
+        variable_pool: Optional[VariablePool] = None,
     ) -> Tool:
         """
         get the agent tool runtime
@@ -316,24 +323,9 @@ class ToolManager:
         )
         runtime_parameters = {}
         parameters = tool_entity.get_merged_runtime_parameters()
-        for parameter in parameters:
-            # check file types
-            if (
-                parameter.type
-                in {
-                    ToolParameter.ToolParameterType.SYSTEM_FILES,
-                    ToolParameter.ToolParameterType.FILE,
-                    ToolParameter.ToolParameterType.FILES,
-                }
-                and parameter.required
-            ):
-                raise ValueError(f"file type parameter {parameter.name} not supported in agent")
-
-            if parameter.form == ToolParameter.ToolParameterForm.FORM:
-                # save tool parameter to tool entity memory
-                value = parameter.init_frontend_parameter(agent_tool.tool_parameters.get(parameter.name))
-                runtime_parameters[parameter.name] = value
-
+        runtime_parameters = cls._convert_tool_parameters_type(
+            parameters, variable_pool, agent_tool.tool_parameters, typ="agent"
+        )
         # decrypt runtime parameters
         encryption_manager = ToolParameterConfigurationManager(
             tenant_id=tenant_id,
@@ -357,10 +349,12 @@ class ToolManager:
         node_id: str,
         workflow_tool: "ToolEntity",
         invoke_from: InvokeFrom = InvokeFrom.DEBUGGER,
+        variable_pool: Optional[VariablePool] = None,
     ) -> Tool:
         """
         get the workflow tool runtime
         """
+
         tool_runtime = cls.get_tool_runtime(
             provider_type=workflow_tool.provider_type,
             provider_id=workflow_tool.provider_id,
@@ -369,15 +363,11 @@ class ToolManager:
             invoke_from=invoke_from,
             tool_invoke_from=ToolInvokeFrom.WORKFLOW,
         )
-        runtime_parameters = {}
-        parameters = tool_runtime.get_merged_runtime_parameters()
-
-        for parameter in parameters:
-            # save tool parameter to tool entity memory
-            if parameter.form == ToolParameter.ToolParameterForm.FORM:
-                value = parameter.init_frontend_parameter(workflow_tool.tool_configurations.get(parameter.name))
-                runtime_parameters[parameter.name] = value
 
+        parameters = tool_runtime.get_merged_runtime_parameters()
+        runtime_parameters = cls._convert_tool_parameters_type(
+            parameters, variable_pool, workflow_tool.tool_configurations, typ="workflow"
+        )
         # decrypt runtime parameters
         encryption_manager = ToolParameterConfigurationManager(
             tenant_id=tenant_id,
@@ -569,7 +559,7 @@ class ToolManager:
 
         filters = []
         if not typ:
-            filters.extend(["builtin", "api", "workflow"])
+            filters.extend(["builtin", "api", "workflow", "mcp"])
         else:
             filters.append(typ)
 
@@ -663,6 +653,10 @@ class ToolManager:
                         labels=labels.get(provider_controller.provider_id, []),
                     )
                     result_providers[f"workflow_provider.{user_provider.name}"] = user_provider
+            if "mcp" in filters:
+                mcp_providers = MCPToolManageService.retrieve_mcp_tools(tenant_id, for_list=True)
+                for mcp_provider in mcp_providers:
+                    result_providers[f"mcp_provider.{mcp_provider.name}"] = mcp_provider
 
         return BuiltinToolProviderSort.sort(list(result_providers.values()))
 
@@ -698,6 +692,32 @@ class ToolManager:
 
         return controller, provider.credentials
 
+    @classmethod
+    def get_mcp_provider_controller(cls, tenant_id: str, provider_id: str) -> MCPToolProviderController:
+        """
+        get the api provider
+
+        :param tenant_id: the id of the tenant
+        :param provider_id: the id of the provider
+
+        :return: the provider controller, the credentials
+        """
+        provider: MCPToolProvider | None = (
+            db.session.query(MCPToolProvider)
+            .filter(
+                MCPToolProvider.server_identifier == provider_id,
+                MCPToolProvider.tenant_id == tenant_id,
+            )
+            .first()
+        )
+
+        if provider is None:
+            raise ToolProviderNotFoundError(f"mcp provider {provider_id} not found")
+
+        controller = MCPToolProviderController._from_db(provider)
+
+        return controller
+
     @classmethod
     def user_get_api_provider(cls, provider: str, tenant_id: str) -> dict:
         """
@@ -826,6 +846,22 @@ class ToolManager:
         except Exception:
             return {"background": "#252525", "content": "\ud83d\ude01"}
 
+    @classmethod
+    def generate_mcp_tool_icon_url(cls, tenant_id: str, provider_id: str) -> dict[str, str] | str:
+        try:
+            mcp_provider: MCPToolProvider | None = (
+                db.session.query(MCPToolProvider)
+                .filter(MCPToolProvider.tenant_id == tenant_id, MCPToolProvider.server_identifier == provider_id)
+                .first()
+            )
+
+            if mcp_provider is None:
+                raise ToolProviderNotFoundError(f"mcp provider {provider_id} not found")
+
+            return mcp_provider.provider_icon
+        except Exception:
+            return {"background": "#252525", "content": "\ud83d\ude01"}
+
     @classmethod
     def get_tool_icon(
         cls,
@@ -863,8 +899,61 @@ class ToolManager:
                 except Exception:
                     return {"background": "#252525", "content": "\ud83d\ude01"}
             raise ValueError(f"plugin provider {provider_id} not found")
+        elif provider_type == ToolProviderType.MCP:
+            return cls.generate_mcp_tool_icon_url(tenant_id, provider_id)
         else:
             raise ValueError(f"provider type {provider_type} not found")
 
+    @classmethod
+    def _convert_tool_parameters_type(
+        cls,
+        parameters: list[ToolParameter],
+        variable_pool: Optional[VariablePool],
+        tool_configurations: dict[str, Any],
+        typ: Literal["agent", "workflow", "tool"] = "workflow",
+    ) -> dict[str, Any]:
+        """
+        Convert tool parameters type
+        """
+        from core.workflow.nodes.tool.entities import ToolNodeData
+        from core.workflow.nodes.tool.exc import ToolParameterError
+
+        runtime_parameters = {}
+        for parameter in parameters:
+            if (
+                parameter.type
+                in {
+                    ToolParameter.ToolParameterType.SYSTEM_FILES,
+                    ToolParameter.ToolParameterType.FILE,
+                    ToolParameter.ToolParameterType.FILES,
+                }
+                and parameter.required
+                and typ == "agent"
+            ):
+                raise ValueError(f"file type parameter {parameter.name} not supported in agent")
+            # save tool parameter to tool entity memory
+            if parameter.form == ToolParameter.ToolParameterForm.FORM:
+                if variable_pool:
+                    config = tool_configurations.get(parameter.name, {})
+                    if not (config and isinstance(config, dict) and config.get("value") is not None):
+                        continue
+                    tool_input = ToolNodeData.ToolInput(**tool_configurations.get(parameter.name, {}))
+                    if tool_input.type == "variable":
+                        variable = variable_pool.get(tool_input.value)
+                        if variable is None:
+                            raise ToolParameterError(f"Variable {tool_input.value} does not exist")
+                        parameter_value = variable.value
+                    elif tool_input.type in {"mixed", "constant"}:
+                        segment_group = variable_pool.convert_template(str(tool_input.value))
+                        parameter_value = segment_group.text
+                    else:
+                        raise ToolParameterError(f"Unknown tool input type '{tool_input.type}'")
+                    runtime_parameters[parameter.name] = parameter_value
+
+                else:
+                    value = parameter.init_frontend_parameter(tool_configurations.get(parameter.name))
+                    runtime_parameters[parameter.name] = value
+        return runtime_parameters
+
 
 ToolManager.load_hardcoded_providers_cache()

api/core/tools/utils/configuration.py

@@ -72,21 +72,21 @@ class ProviderConfigEncrypter(BaseModel):
 
         return data
 
-    def decrypt(self, data: dict[str, str]) -> dict[str, str]:
+    def decrypt(self, data: dict[str, str], use_cache: bool = True) -> dict[str, str]:
         """
         decrypt tool credentials with tenant id
 
         return a deep copy of credentials with decrypted values
         """
-        cache = ToolProviderCredentialsCache(
-            tenant_id=self.tenant_id,
-            identity_id=f"{self.provider_type}.{self.provider_identity}",
-            cache_type=ToolProviderCredentialsCacheType.PROVIDER,
-        )
-        cached_credentials = cache.get()
-        if cached_credentials:
-            return cached_credentials
-
+        if use_cache:
+            cache = ToolProviderCredentialsCache(
+                tenant_id=self.tenant_id,
+                identity_id=f"{self.provider_type}.{self.provider_identity}",
+                cache_type=ToolProviderCredentialsCacheType.PROVIDER,
+            )
+            cached_credentials = cache.get()
+            if cached_credentials:
+                return cached_credentials
         data = self._deep_copy(data)
         # get fields need to be decrypted
         fields = dict[str, BasicProviderConfig]()
@@ -105,7 +105,8 @@ class ProviderConfigEncrypter(BaseModel):
                     except Exception:
                         pass
 
-        cache.set(data)
+        if use_cache:
+            cache.set(data)
         return data
 
     def delete_tool_credentials_cache(self):

api/core/tools/workflow_as_tool/tool.py

@@ -8,7 +8,12 @@ from flask_login import current_user
 from core.file import FILE_MODEL_IDENTITY, File, FileTransferMethod
 from core.tools.__base.tool import Tool
 from core.tools.__base.tool_runtime import ToolRuntime
-from core.tools.entities.tool_entities import ToolEntity, ToolInvokeMessage, ToolParameter, ToolProviderType
+from core.tools.entities.tool_entities import (
+    ToolEntity,
+    ToolInvokeMessage,
+    ToolParameter,
+    ToolProviderType,
+)
 from core.tools.errors import ToolInvokeError
 from extensions.ext_database import db
 from factories.file_factory import build_from_mapping

api/core/workflow/nodes/agent/agent_node.py

@@ -3,11 +3,13 @@ import uuid
 from collections.abc import Generator, Mapping, Sequence
 from typing import Any, Optional, cast
 
+from packaging.version import Version
 from sqlalchemy import select
 from sqlalchemy.orm import Session
 
 from core.agent.entities import AgentToolEntity
 from core.agent.plugin_entities import AgentStrategyParameter
+from core.agent.strategy.plugin import PluginAgentStrategy
 from core.memory.token_buffer_memory import TokenBufferMemory
 from core.model_manager import ModelInstance, ModelManager
 from core.model_runtime.entities.model_entities import AIModelEntity, ModelType
@@ -73,12 +75,14 @@ class AgentNode(ToolNode):
             agent_parameters=agent_parameters,
             variable_pool=self.graph_runtime_state.variable_pool,
             node_data=node_data,
+            strategy=strategy,
         )
         parameters_for_log = self._generate_agent_parameters(
             agent_parameters=agent_parameters,
             variable_pool=self.graph_runtime_state.variable_pool,
             node_data=node_data,
             for_log=True,
+            strategy=strategy,
         )
 
         # get conversation id
@@ -155,6 +159,7 @@ class AgentNode(ToolNode):
         variable_pool: VariablePool,
         node_data: AgentNodeData,
         for_log: bool = False,
+        strategy: PluginAgentStrategy,
     ) -> dict[str, Any]:
         """
         Generate parameters based on the given tool parameters, variable pool, and node data.
@@ -207,7 +212,7 @@ class AgentNode(ToolNode):
             if parameter.type == "array[tools]":
                 value = cast(list[dict[str, Any]], value)
                 value = [tool for tool in value if tool.get("enabled", False)]
-
+                value = self._filter_mcp_type_tool(strategy, value)
                 for tool in value:
                     if "schemas" in tool:
                         tool.pop("schemas")
@@ -244,9 +249,9 @@ class AgentNode(ToolNode):
                         )
 
                         extra = tool.get("extra", {})
-
+                        runtime_variable_pool = variable_pool if self.node_data.version != "1" else None
                         tool_runtime = ToolManager.get_agent_tool_runtime(
-                            self.tenant_id, self.app_id, entity, self.invoke_from
+                            self.tenant_id, self.app_id, entity, self.invoke_from, runtime_variable_pool
                         )
                         if tool_runtime.entity.description:
                             tool_runtime.entity.description.llm = (
@@ -398,3 +403,16 @@ class AgentNode(ToolNode):
                 except ValueError:
                     model_schema.features.remove(feature)
         return model_schema
+
+    def _filter_mcp_type_tool(self, strategy: PluginAgentStrategy, tools: list[dict[str, Any]]) -> list[dict[str, Any]]:
+        """
+        Filter MCP type tool
+        :param strategy: plugin agent strategy
+        :param tool: tool
+        :return: filtered tool dict
+        """
+        meta_version = strategy.meta_version
+        if meta_version and Version(meta_version) > Version("0.0.1"):
+            return tools
+        else:
+            return [tool for tool in tools if tool.get("type") != ToolProviderType.MCP.value]

api/core/workflow/nodes/node_mapping.py

@@ -73,6 +73,7 @@ NODE_TYPE_CLASSES_MAPPING: Mapping[NodeType, Mapping[str, type[BaseNode]]] = {
     },
     NodeType.TOOL: {
         LATEST_VERSION: ToolNode,
+        "2": ToolNode,
         "1": ToolNode,
     },
     NodeType.VARIABLE_AGGREGATOR: {
@@ -122,6 +123,7 @@ NODE_TYPE_CLASSES_MAPPING: Mapping[NodeType, Mapping[str, type[BaseNode]]] = {
     },
     NodeType.AGENT: {
         LATEST_VERSION: AgentNode,
+        "2": AgentNode,
         "1": AgentNode,
     },
 }

api/core/workflow/nodes/tool/entities.py

@@ -41,6 +41,10 @@ class ToolNodeData(BaseNodeData, ToolEntity):
         def check_type(cls, value, validation_info: ValidationInfo):
             typ = value
             value = validation_info.data.get("value")
+
+            if value is None:
+                return typ
+
             if typ == "mixed" and not isinstance(value, str):
                 raise ValueError("value must be a string")
             elif typ == "variable":
@@ -54,3 +58,22 @@ class ToolNodeData(BaseNodeData, ToolEntity):
             return typ
 
     tool_parameters: dict[str, ToolInput]
+
+    @field_validator("tool_parameters", mode="before")
+    @classmethod
+    def filter_none_tool_inputs(cls, value):
+        if not isinstance(value, dict):
+            return value
+
+        return {
+            key: tool_input
+            for key, tool_input in value.items()
+            if tool_input is not None and cls._has_valid_value(tool_input)
+        }
+
+    @staticmethod
+    def _has_valid_value(tool_input):
+        """Check if the value is valid"""
+        if isinstance(tool_input, dict):
+            return tool_input.get("value") is not None
+        return getattr(tool_input, "value", None) is not None

api/core/workflow/nodes/tool/tool_node.py

@@ -67,8 +67,9 @@ class ToolNode(BaseNode[ToolNodeData]):
         try:
             from core.tools.tool_manager import ToolManager
 
+            variable_pool = self.graph_runtime_state.variable_pool if self.node_data.version != "1" else None
             tool_runtime = ToolManager.get_workflow_tool_runtime(
-                self.tenant_id, self.app_id, self.node_id, self.node_data, self.invoke_from
+                self.tenant_id, self.app_id, self.node_id, self.node_data, self.invoke_from, variable_pool
             )
         except ToolNodeError as e:
             yield RunCompletedEvent(
@@ -95,7 +96,6 @@ class ToolNode(BaseNode[ToolNodeData]):
             node_data=self.node_data,
             for_log=True,
         )
-
         # get conversation id
         conversation_id = self.graph_runtime_state.variable_pool.get(["sys", SystemVariableKey.CONVERSATION_ID])
 

api/extensions/ext_blueprints.py

@@ -10,6 +10,7 @@ def init_app(app: DifyApp):
     from controllers.console import bp as console_app_bp
     from controllers.files import bp as files_bp
     from controllers.inner_api import bp as inner_api_bp
+    from controllers.mcp import bp as mcp_bp
     from controllers.service_api import bp as service_api_bp
     from controllers.web import bp as web_bp
 
@@ -46,3 +47,4 @@ def init_app(app: DifyApp):
     app.register_blueprint(files_bp)
 
     app.register_blueprint(inner_api_bp)
+    app.register_blueprint(mcp_bp)

api/extensions/ext_login.py

@@ -10,7 +10,7 @@ from dify_app import DifyApp
 from extensions.ext_database import db
 from libs.passport import PassportService
 from models.account import Account, Tenant, TenantAccountJoin
-from models.model import EndUser
+from models.model import AppMCPServer, EndUser
 from services.account_service import AccountService
 
 login_manager = flask_login.LoginManager()
@@ -74,6 +74,21 @@ def load_user_from_request(request_from_flask_login):
         if not end_user:
             raise NotFound("End user not found.")
         return end_user
+    elif request.blueprint == "mcp":
+        server_code = request.view_args.get("server_code") if request.view_args else None
+        if not server_code:
+            raise Unauthorized("Invalid Authorization token.")
+        app_mcp_server = db.session.query(AppMCPServer).filter(AppMCPServer.server_code == server_code).first()
+        if not app_mcp_server:
+            raise NotFound("App MCP server not found.")
+        end_user = (
+            db.session.query(EndUser)
+            .filter(EndUser.external_user_id == app_mcp_server.id, EndUser.type == "mcp")
+            .first()
+        )
+        if not end_user:
+            raise NotFound("End user not found.")
+        return end_user
 
 
 @user_logged_in.connect

api/factories/agent_factory.py

@@ -10,6 +10,6 @@ def get_plugin_agent_strategy(
     agent_provider = manager.fetch_agent_strategy_provider(tenant_id, agent_strategy_provider_name)
     for agent_strategy in agent_provider.declaration.strategies:
         if agent_strategy.identity.name == agent_strategy_name:
-            return PluginAgentStrategy(tenant_id, agent_strategy)
+            return PluginAgentStrategy(tenant_id, agent_strategy, agent_provider.meta.version)
 
     raise ValueError(f"Agent strategy {agent_strategy_name} not found")

api/fields/app_fields.py

@@ -1,8 +1,21 @@
+import json
+
 from flask_restful import fields
 
 from fields.workflow_fields import workflow_partial_fields
 from libs.helper import AppIconUrlField, TimestampField
 
+
+class JsonStringField(fields.Raw):
+    def format(self, value):
+        if isinstance(value, str):
+            try:
+                return json.loads(value)
+            except (json.JSONDecodeError, TypeError):
+                return value
+        return value
+
+
 app_detail_kernel_fields = {
     "id": fields.String,
     "name": fields.String,
@@ -218,3 +231,14 @@ app_import_fields = {
 app_import_check_dependencies_fields = {
     "leaked_dependencies": fields.List(fields.Nested(leaked_dependency_fields)),
 }
+
+app_server_fields = {
+    "id": fields.String,
+    "name": fields.String,
+    "server_code": fields.String,
+    "description": fields.String,
+    "status": fields.String,
+    "parameters": JsonStringField,
+    "created_at": TimestampField,
+    "updated_at": TimestampField,
+}

api/migrations/versions/2025_06_25_0936-58eb7bdb93fe_add_mcp_server_tool_and_app_server.py

@@ -0,0 +1,64 @@
+"""add mcp server tool and app server
+
+Revision ID: 58eb7bdb93fe
+Revises: 0ab65e1cc7fa
+Create Date: 2025-06-25 09:36:07.510570
+
+"""
+from alembic import op
+import models as models
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '58eb7bdb93fe'
+down_revision = '0ab65e1cc7fa'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('app_mcp_servers',
+    sa.Column('id', models.types.StringUUID(), server_default=sa.text('uuid_generate_v4()'), nullable=False),
+    sa.Column('tenant_id', models.types.StringUUID(), nullable=False),
+    sa.Column('app_id', models.types.StringUUID(), nullable=False),
+    sa.Column('name', sa.String(length=255), nullable=False),
+    sa.Column('description', sa.String(length=255), nullable=False),
+    sa.Column('server_code', sa.String(length=255), nullable=False),
+    sa.Column('status', sa.String(length=255), server_default=sa.text("'normal'::character varying"), nullable=False),
+    sa.Column('parameters', sa.Text(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), server_default=sa.text('CURRENT_TIMESTAMP'), nullable=False),
+    sa.Column('updated_at', sa.DateTime(), server_default=sa.text('CURRENT_TIMESTAMP'), nullable=False),
+    sa.PrimaryKeyConstraint('id', name='app_mcp_server_pkey'),
+    sa.UniqueConstraint('tenant_id', 'app_id', name='unique_app_mcp_server_tenant_app_id'),
+    sa.UniqueConstraint('server_code', name='unique_app_mcp_server_server_code')
+    )
+    op.create_table('tool_mcp_providers',
+    sa.Column('id', models.types.StringUUID(), server_default=sa.text('uuid_generate_v4()'), nullable=False),
+    sa.Column('name', sa.String(length=40), nullable=False),
+    sa.Column('server_identifier', sa.String(length=24), nullable=False),
+    sa.Column('server_url', sa.Text(), nullable=False),
+    sa.Column('server_url_hash', sa.String(length=64), nullable=False),
+    sa.Column('icon', sa.String(length=255), nullable=True),
+    sa.Column('tenant_id', models.types.StringUUID(), nullable=False),
+    sa.Column('user_id', models.types.StringUUID(), nullable=False),
+    sa.Column('encrypted_credentials', sa.Text(), nullable=True),
+    sa.Column('authed', sa.Boolean(), nullable=False),
+    sa.Column('tools', sa.Text(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), server_default=sa.text('CURRENT_TIMESTAMP(0)'), nullable=False),
+    sa.Column('updated_at', sa.DateTime(), server_default=sa.text('CURRENT_TIMESTAMP(0)'), nullable=False),
+    sa.PrimaryKeyConstraint('id', name='tool_mcp_provider_pkey'),
+    sa.UniqueConstraint('tenant_id', 'name', name='unique_mcp_provider_name'),
+    sa.UniqueConstraint('tenant_id', 'server_identifier', name='unique_mcp_provider_server_identifier'),
+    sa.UniqueConstraint('tenant_id', 'server_url_hash', name='unique_mcp_provider_server_url')
+    )
+
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('tool_mcp_providers')
+    op.drop_table('app_mcp_servers')
+    # ### end Alembic commands ###

api/models/__init__.py

@@ -34,6 +34,7 @@ from .model import (
     App,
     AppAnnotationHitHistory,
     AppAnnotationSetting,
+    AppMCPServer,
     AppMode,
     AppModelConfig,
     Conversation,
@@ -103,6 +104,7 @@ __all__ = [
     "AppAnnotationHitHistory",
     "AppAnnotationSetting",
     "AppDatasetJoin",
+    "AppMCPServer",  # Added
     "AppMode",
     "AppModelConfig",
     "BuiltinToolProvider",

api/models/model.py

@@ -1456,6 +1456,39 @@ class EndUser(Base, UserMixin):
     updated_at = db.Column(db.DateTime, nullable=False, server_default=func.current_timestamp())
 
 
+class AppMCPServer(Base):
+    __tablename__ = "app_mcp_servers"
+    __table_args__ = (
+        db.PrimaryKeyConstraint("id", name="app_mcp_server_pkey"),
+        db.UniqueConstraint("tenant_id", "app_id", name="unique_app_mcp_server_tenant_app_id"),
+        db.UniqueConstraint("server_code", name="unique_app_mcp_server_server_code"),
+    )
+    id = db.Column(StringUUID, server_default=db.text("uuid_generate_v4()"))
+    tenant_id = db.Column(StringUUID, nullable=False)
+    app_id = db.Column(StringUUID, nullable=False)
+    name = db.Column(db.String(255), nullable=False)
+    description = db.Column(db.String(255), nullable=False)
+    server_code = db.Column(db.String(255), nullable=False)
+    status = db.Column(db.String(255), nullable=False, server_default=db.text("'normal'::character varying"))
+    parameters = db.Column(db.Text, nullable=False)
+
+    created_at = db.Column(db.DateTime, nullable=False, server_default=func.current_timestamp())
+    updated_at = db.Column(db.DateTime, nullable=False, server_default=func.current_timestamp())
+
+    @staticmethod
+    def generate_server_code(n):
+        while True:
+            result = generate_string(n)
+            while db.session.query(AppMCPServer).filter(AppMCPServer.server_code == result).count() > 0:
+                result = generate_string(n)
+
+            return result
+
+    @property
+    def parameters_dict(self) -> dict[str, Any]:
+        return cast(dict[str, Any], json.loads(self.parameters))
+
+
 class Site(Base):
     __tablename__ = "sites"
     __table_args__ = (

api/models/tools.py

@@ -1,12 +1,16 @@
 import json
 from datetime import datetime
 from typing import Any, cast
+from urllib.parse import urlparse
 
 import sqlalchemy as sa
 from deprecated import deprecated
 from sqlalchemy import ForeignKey, func
 from sqlalchemy.orm import Mapped, mapped_column
 
+from core.file import helpers as file_helpers
+from core.helper import encrypter
+from core.mcp.types import Tool
 from core.tools.entities.common_entities import I18nObject
 from core.tools.entities.tool_bundle import ApiToolBundle
 from core.tools.entities.tool_entities import ApiProviderSchemaType, WorkflowToolParameterConfiguration
@@ -189,6 +193,108 @@ class WorkflowToolProvider(Base):
         return db.session.query(App).filter(App.id == self.app_id).first()
 
 
+class MCPToolProvider(Base):
+    """
+    The table stores the mcp providers.
+    """
+
+    __tablename__ = "tool_mcp_providers"
+    __table_args__ = (
+        db.PrimaryKeyConstraint("id", name="tool_mcp_provider_pkey"),
+        db.UniqueConstraint("tenant_id", "server_url_hash", name="unique_mcp_provider_server_url"),
+        db.UniqueConstraint("tenant_id", "name", name="unique_mcp_provider_name"),
+        db.UniqueConstraint("tenant_id", "server_identifier", name="unique_mcp_provider_server_identifier"),
+    )
+
+    id: Mapped[str] = mapped_column(StringUUID, server_default=db.text("uuid_generate_v4()"))
+    # name of the mcp provider
+    name: Mapped[str] = mapped_column(db.String(40), nullable=False)
+    # server identifier of the mcp provider
+    server_identifier: Mapped[str] = mapped_column(db.String(24), nullable=False)
+    # encrypted url of the mcp provider
+    server_url: Mapped[str] = mapped_column(db.Text, nullable=False)
+    # hash of server_url for uniqueness check
+    server_url_hash: Mapped[str] = mapped_column(db.String(64), nullable=False)
+    # icon of the mcp provider
+    icon: Mapped[str] = mapped_column(db.String(255), nullable=True)
+    # tenant id
+    tenant_id: Mapped[str] = mapped_column(StringUUID, nullable=False)
+    # who created this tool
+    user_id: Mapped[str] = mapped_column(StringUUID, nullable=False)
+    # encrypted credentials
+    encrypted_credentials: Mapped[str] = mapped_column(db.Text, nullable=True)
+    # authed
+    authed: Mapped[bool] = mapped_column(db.Boolean, nullable=False, default=False)
+    # tools
+    tools: Mapped[str] = mapped_column(db.Text, nullable=False, default="[]")
+    created_at: Mapped[datetime] = mapped_column(
+        db.DateTime, nullable=False, server_default=db.text("CURRENT_TIMESTAMP(0)")
+    )
+    updated_at: Mapped[datetime] = mapped_column(
+        db.DateTime, nullable=False, server_default=db.text("CURRENT_TIMESTAMP(0)")
+    )
+
+    def load_user(self) -> Account | None:
+        return db.session.query(Account).filter(Account.id == self.user_id).first()
+
+    @property
+    def tenant(self) -> Tenant | None:
+        return db.session.query(Tenant).filter(Tenant.id == self.tenant_id).first()
+
+    @property
+    def credentials(self) -> dict:
+        try:
+            return cast(dict, json.loads(self.encrypted_credentials)) or {}
+        except Exception:
+            return {}
+
+    @property
+    def mcp_tools(self) -> list[Tool]:
+        return [Tool(**tool) for tool in json.loads(self.tools)]
+
+    @property
+    def provider_icon(self) -> dict[str, str] | str:
+        try:
+            return cast(dict[str, str], json.loads(self.icon))
+        except json.JSONDecodeError:
+            return file_helpers.get_signed_file_url(self.icon)
+
+    @property
+    def decrypted_server_url(self) -> str:
+        return cast(str, encrypter.decrypt_token(self.tenant_id, self.server_url))
+
+    @property
+    def masked_server_url(self) -> str:
+        def mask_url(url: str, mask_char: str = "*") -> str:
+            """
+            mask the url to a simple string
+            """
+            parsed = urlparse(url)
+            base_url = f"{parsed.scheme}://{parsed.netloc}"
+
+            if parsed.path and parsed.path != "/":
+                return f"{base_url}/{mask_char * 6}"
+            else:
+                return base_url
+
+        return mask_url(self.decrypted_server_url)
+
+    @property
+    def decrypted_credentials(self) -> dict:
+        from core.tools.mcp_tool.provider import MCPToolProviderController
+        from core.tools.utils.configuration import ProviderConfigEncrypter
+
+        provider_controller = MCPToolProviderController._from_db(self)
+
+        tool_configuration = ProviderConfigEncrypter(
+            tenant_id=self.tenant_id,
+            config=list(provider_controller.get_credentials_schema()),
+            provider_type=provider_controller.provider_type.value,
+            provider_identity=provider_controller.provider_id,
+        )
+        return tool_configuration.decrypt(self.credentials, use_cache=False)
+
+
 class ToolModelInvoke(Base):
     """
     store the invoke logs from tool invoke

api/pyproject.toml

@@ -82,6 +82,8 @@ dependencies = [
     "weave~=0.51.0",
     "yarl~=1.18.3",
     "webvtt-py~=0.5.1",
+    "sseclient-py>=1.8.0",
+    "httpx-sse>=0.4.0",
     "sendgrid~=6.12.3",
 ]
 # Before adding new dependency, consider place it in

api/services/tools/mcp_tools_mange_service.py

@@ -0,0 +1,232 @@
+import hashlib
+import json
+from datetime import datetime
+from typing import Any
+
+from sqlalchemy import or_
+from sqlalchemy.exc import IntegrityError
+
+from core.helper import encrypter
+from core.mcp.error import MCPAuthError, MCPError
+from core.mcp.mcp_client import MCPClient
+from core.tools.entities.api_entities import ToolProviderApiEntity
+from core.tools.entities.common_entities import I18nObject
+from core.tools.entities.tool_entities import ToolProviderType
+from core.tools.mcp_tool.provider import MCPToolProviderController
+from core.tools.utils.configuration import ProviderConfigEncrypter
+from extensions.ext_database import db
+from models.tools import MCPToolProvider
+from services.tools.tools_transform_service import ToolTransformService
+
+UNCHANGED_SERVER_URL_PLACEHOLDER = "[__HIDDEN__]"
+
+
+class MCPToolManageService:
+    """
+    Service class for managing mcp tools.
+    """
+
+    @staticmethod
+    def get_mcp_provider_by_provider_id(provider_id: str, tenant_id: str) -> MCPToolProvider:
+        res = (
+            db.session.query(MCPToolProvider)
+            .filter(MCPToolProvider.tenant_id == tenant_id, MCPToolProvider.id == provider_id)
+            .first()
+        )
+        if not res:
+            raise ValueError("MCP tool not found")
+        return res
+
+    @staticmethod
+    def get_mcp_provider_by_server_identifier(server_identifier: str, tenant_id: str) -> MCPToolProvider:
+        res = (
+            db.session.query(MCPToolProvider)
+            .filter(MCPToolProvider.tenant_id == tenant_id, MCPToolProvider.server_identifier == server_identifier)
+            .first()
+        )
+        if not res:
+            raise ValueError("MCP tool not found")
+        return res
+
+    @staticmethod
+    def create_mcp_provider(
+        tenant_id: str,
+        name: str,
+        server_url: str,
+        user_id: str,
+        icon: str,
+        icon_type: str,
+        icon_background: str,
+        server_identifier: str,
+    ) -> ToolProviderApiEntity:
+        server_url_hash = hashlib.sha256(server_url.encode()).hexdigest()
+        existing_provider = (
+            db.session.query(MCPToolProvider)
+            .filter(
+                MCPToolProvider.tenant_id == tenant_id,
+                or_(
+                    MCPToolProvider.name == name,
+                    MCPToolProvider.server_url_hash == server_url_hash,
+                    MCPToolProvider.server_identifier == server_identifier,
+                ),
+                MCPToolProvider.tenant_id == tenant_id,
+            )
+            .first()
+        )
+        if existing_provider:
+            if existing_provider.name == name:
+                raise ValueError(f"MCP tool {name} already exists")
+            elif existing_provider.server_url_hash == server_url_hash:
+                raise ValueError(f"MCP tool {server_url} already exists")
+            elif existing_provider.server_identifier == server_identifier:
+                raise ValueError(f"MCP tool {server_identifier} already exists")
+        encrypted_server_url = encrypter.encrypt_token(tenant_id, server_url)
+        mcp_tool = MCPToolProvider(
+            tenant_id=tenant_id,
+            name=name,
+            server_url=encrypted_server_url,
+            server_url_hash=server_url_hash,
+            user_id=user_id,
+            authed=False,
+            tools="[]",
+            icon=json.dumps({"content": icon, "background": icon_background}) if icon_type == "emoji" else icon,
+            server_identifier=server_identifier,
+        )
+        db.session.add(mcp_tool)
+        db.session.commit()
+        return ToolTransformService.mcp_provider_to_user_provider(mcp_tool, for_list=True)
+
+    @staticmethod
+    def retrieve_mcp_tools(tenant_id: str, for_list: bool = False) -> list[ToolProviderApiEntity]:
+        mcp_providers = (
+            db.session.query(MCPToolProvider)
+            .filter(MCPToolProvider.tenant_id == tenant_id)
+            .order_by(MCPToolProvider.name)
+            .all()
+        )
+        return [
+            ToolTransformService.mcp_provider_to_user_provider(mcp_provider, for_list=for_list)
+            for mcp_provider in mcp_providers
+        ]
+
+    @classmethod
+    def list_mcp_tool_from_remote_server(cls, tenant_id: str, provider_id: str):
+        mcp_provider = cls.get_mcp_provider_by_provider_id(provider_id, tenant_id)
+
+        try:
+            with MCPClient(
+                mcp_provider.decrypted_server_url, provider_id, tenant_id, authed=mcp_provider.authed, for_list=True
+            ) as mcp_client:
+                tools = mcp_client.list_tools()
+        except MCPAuthError as e:
+            raise ValueError("Please auth the tool first")
+        except MCPError as e:
+            raise ValueError(f"Failed to connect to MCP server: {e}")
+        mcp_provider.tools = json.dumps([tool.model_dump() for tool in tools])
+        mcp_provider.authed = True
+        mcp_provider.updated_at = datetime.now()
+        db.session.commit()
+        user = mcp_provider.load_user()
+        return ToolProviderApiEntity(
+            id=mcp_provider.id,
+            name=mcp_provider.name,
+            tools=ToolTransformService.mcp_tool_to_user_tool(mcp_provider, tools),
+            type=ToolProviderType.MCP,
+            icon=mcp_provider.icon,
+            author=user.name if user else "Anonymous",
+            server_url=mcp_provider.masked_server_url,
+            updated_at=int(mcp_provider.updated_at.timestamp()),
+            description=I18nObject(en_US="", zh_Hans=""),
+            label=I18nObject(en_US=mcp_provider.name, zh_Hans=mcp_provider.name),
+            plugin_unique_identifier=mcp_provider.server_identifier,
+        )
+
+    @classmethod
+    def delete_mcp_tool(cls, tenant_id: str, provider_id: str):
+        mcp_tool = cls.get_mcp_provider_by_provider_id(provider_id, tenant_id)
+
+        db.session.delete(mcp_tool)
+        db.session.commit()
+
+    @classmethod
+    def update_mcp_provider(
+        cls,
+        tenant_id: str,
+        provider_id: str,
+        name: str,
+        server_url: str,
+        icon: str,
+        icon_type: str,
+        icon_background: str,
+        server_identifier: str,
+    ):
+        mcp_provider = cls.get_mcp_provider_by_provider_id(provider_id, tenant_id)
+        mcp_provider.updated_at = datetime.now()
+        mcp_provider.name = name
+        mcp_provider.icon = (
+            json.dumps({"content": icon, "background": icon_background}) if icon_type == "emoji" else icon
+        )
+        mcp_provider.server_identifier = server_identifier
+
+        if UNCHANGED_SERVER_URL_PLACEHOLDER not in server_url:
+            encrypted_server_url = encrypter.encrypt_token(tenant_id, server_url)
+            mcp_provider.server_url = encrypted_server_url
+            server_url_hash = hashlib.sha256(server_url.encode()).hexdigest()
+
+            if server_url_hash != mcp_provider.server_url_hash:
+                cls._re_connect_mcp_provider(mcp_provider, provider_id, tenant_id)
+                mcp_provider.server_url_hash = server_url_hash
+        try:
+            db.session.commit()
+        except IntegrityError as e:
+            db.session.rollback()
+            error_msg = str(e.orig)
+            if "unique_mcp_provider_name" in error_msg:
+                raise ValueError(f"MCP tool {name} already exists")
+            elif "unique_mcp_provider_server_url" in error_msg:
+                raise ValueError(f"MCP tool {server_url} already exists")
+            elif "unique_mcp_provider_server_identifier" in error_msg:
+                raise ValueError(f"MCP tool {server_identifier} already exists")
+            else:
+                raise
+
+    @classmethod
+    def update_mcp_provider_credentials(
+        cls, mcp_provider: MCPToolProvider, credentials: dict[str, Any], authed: bool = False
+    ):
+        provider_controller = MCPToolProviderController._from_db(mcp_provider)
+        tool_configuration = ProviderConfigEncrypter(
+            tenant_id=mcp_provider.tenant_id,
+            config=list(provider_controller.get_credentials_schema()),
+            provider_type=provider_controller.provider_type.value,
+            provider_identity=provider_controller.provider_id,
+        )
+        credentials = tool_configuration.encrypt(credentials)
+        mcp_provider.updated_at = datetime.now()
+        mcp_provider.encrypted_credentials = json.dumps({**mcp_provider.credentials, **credentials})
+        mcp_provider.authed = authed
+        if not authed:
+            mcp_provider.tools = "[]"
+        db.session.commit()
+
+    @classmethod
+    def _re_connect_mcp_provider(cls, mcp_provider: MCPToolProvider, provider_id: str, tenant_id: str):
+        """re-connect mcp provider"""
+        try:
+            with MCPClient(
+                mcp_provider.decrypted_server_url,
+                provider_id,
+                tenant_id,
+                authed=False,
+                for_list=True,
+            ) as mcp_client:
+                tools = mcp_client.list_tools()
+                mcp_provider.authed = True
+                mcp_provider.tools = json.dumps([tool.model_dump() for tool in tools])
+        except MCPAuthError:
+            mcp_provider.authed = False
+            mcp_provider.tools = "[]"
+        except MCPError as e:
+            raise ValueError(f"Failed to re-connect MCP server: {e}") from e
+        # reset credentials
+        mcp_provider.encrypted_credentials = "{}"

api/services/tools/tools_transform_service.py

@@ -1,10 +1,11 @@
 import json
 import logging
-from typing import Optional, Union, cast
+from typing import Any, Optional, Union, cast
 
 from yarl import URL
 
 from configs import dify_config
+from core.mcp.types import Tool as MCPTool
 from core.tools.__base.tool import Tool
 from core.tools.__base.tool_runtime import ToolRuntime
 from core.tools.builtin_tool.provider import BuiltinToolProviderController
@@ -21,7 +22,7 @@ from core.tools.plugin_tool.provider import PluginToolProviderController
 from core.tools.utils.configuration import ProviderConfigEncrypter
 from core.tools.workflow_as_tool.provider import WorkflowToolProviderController
 from core.tools.workflow_as_tool.tool import WorkflowTool
-from models.tools import ApiToolProvider, BuiltinToolProvider, WorkflowToolProvider
+from models.tools import ApiToolProvider, BuiltinToolProvider, MCPToolProvider, WorkflowToolProvider
 
 logger = logging.getLogger(__name__)
 
@@ -52,7 +53,8 @@ class ToolTransformService:
                 return icon
             except Exception:
                 return {"background": "#252525", "content": "\ud83d\ude01"}
-
+        elif provider_type == ToolProviderType.MCP.value:
+            return icon
         return ""
 
     @staticmethod
@@ -187,6 +189,41 @@ class ToolTransformService:
             labels=labels or [],
         )
 
+    @staticmethod
+    def mcp_provider_to_user_provider(db_provider: MCPToolProvider, for_list: bool = False) -> ToolProviderApiEntity:
+        user = db_provider.load_user()
+        return ToolProviderApiEntity(
+            id=db_provider.server_identifier if not for_list else db_provider.id,
+            author=user.name if user else "Anonymous",
+            name=db_provider.name,
+            icon=db_provider.provider_icon,
+            type=ToolProviderType.MCP,
+            is_team_authorization=db_provider.authed,
+            server_url=db_provider.masked_server_url,
+            tools=ToolTransformService.mcp_tool_to_user_tool(
+                db_provider, [MCPTool(**tool) for tool in json.loads(db_provider.tools)]
+            ),
+            updated_at=int(db_provider.updated_at.timestamp()),
+            label=I18nObject(en_US=db_provider.name, zh_Hans=db_provider.name),
+            description=I18nObject(en_US="", zh_Hans=""),
+            server_identifier=db_provider.server_identifier,
+        )
+
+    @staticmethod
+    def mcp_tool_to_user_tool(mcp_provider: MCPToolProvider, tools: list[MCPTool]) -> list[ToolApiEntity]:
+        user = mcp_provider.load_user()
+        return [
+            ToolApiEntity(
+                author=user.name if user else "Anonymous",
+                name=tool.name,
+                label=I18nObject(en_US=tool.name, zh_Hans=tool.name),
+                description=I18nObject(en_US=tool.description, zh_Hans=tool.description),
+                parameters=ToolTransformService.convert_mcp_schema_to_parameter(tool.inputSchema),
+                labels=[],
+            )
+            for tool in tools
+        ]
+
     @classmethod
     def api_provider_to_user_provider(
         cls,
@@ -304,3 +341,53 @@ class ToolTransformService:
                 parameters=tool.parameters,
                 labels=labels or [],
             )
+
+    @staticmethod
+    def convert_mcp_schema_to_parameter(schema: dict) -> list["ToolParameter"]:
+        """
+        Convert MCP JSON schema to tool parameters
+
+        :param schema: JSON schema dictionary
+        :return: list of ToolParameter instances
+        """
+
+        def create_parameter(
+            name: str, description: str, param_type: str, required: bool, input_schema: dict | None = None
+        ) -> ToolParameter:
+            """Create a ToolParameter instance with given attributes"""
+            input_schema_dict: dict[str, Any] = {"input_schema": input_schema} if input_schema else {}
+            return ToolParameter(
+                name=name,
+                llm_description=description,
+                label=I18nObject(en_US=name),
+                form=ToolParameter.ToolParameterForm.LLM,
+                required=required,
+                type=ToolParameter.ToolParameterType(param_type),
+                human_description=I18nObject(en_US=description),
+                **input_schema_dict,
+            )
+
+        def process_properties(props: dict, required: list, prefix: str = "") -> list[ToolParameter]:
+            """Process properties recursively"""
+            TYPE_MAPPING = {"integer": "number", "float": "number"}
+            COMPLEX_TYPES = ["array", "object"]
+
+            parameters = []
+            for name, prop in props.items():
+                current_description = prop.get("description", "")
+                prop_type = prop.get("type", "string")
+
+                if isinstance(prop_type, list):
+                    prop_type = prop_type[0]
+                if prop_type in TYPE_MAPPING:
+                    prop_type = TYPE_MAPPING[prop_type]
+                input_schema = prop if prop_type in COMPLEX_TYPES else None
+                parameters.append(
+                    create_parameter(name, current_description, prop_type, name in required, input_schema)
+                )
+
+            return parameters
+
+        if schema.get("type") == "object" and "properties" in schema:
+            return process_properties(schema["properties"], schema.get("required", []))
+        return []

api/tasks/remove_app_and_related_data_task.py

@@ -13,6 +13,7 @@ from models import (
     AppAnnotationHitHistory,
     AppAnnotationSetting,
     AppDatasetJoin,
+    AppMCPServer,
     AppModelConfig,
     Conversation,
     EndUser,
@@ -41,6 +42,7 @@ def remove_app_and_related_data_task(self, tenant_id: str, app_id: str):
         # Delete related data
         _delete_app_model_configs(tenant_id, app_id)
         _delete_app_site(tenant_id, app_id)
+        _delete_app_mcp_servers(tenant_id, app_id)
         _delete_app_api_tokens(tenant_id, app_id)
         _delete_installed_apps(tenant_id, app_id)
         _delete_recommended_apps(tenant_id, app_id)
@@ -89,6 +91,18 @@ def _delete_app_site(tenant_id: str, app_id: str):
     _delete_records("""select id from sites where app_id=:app_id limit 1000""", {"app_id": app_id}, del_site, "site")
 
 
+def _delete_app_mcp_servers(tenant_id: str, app_id: str):
+    def del_mcp_server(mcp_server_id: str):
+        db.session.query(AppMCPServer).filter(AppMCPServer.id == mcp_server_id).delete(synchronize_session=False)
+
+    _delete_records(
+        """select id from app_mcp_servers where app_id=:app_id limit 1000""",
+        {"app_id": app_id},
+        del_mcp_server,
+        "app mcp server",
+    )
+
+
 def _delete_app_api_tokens(tenant_id: str, app_id: str):
     def del_api_token(api_token_id: str):
         db.session.query(ApiToken).filter(ApiToken.id == api_token_id).delete(synchronize_session=False)

api/tests/unit_tests/core/mcp/client/test_session.py

@@ -0,0 +1,471 @@
+import queue
+import threading
+from typing import Any
+
+from core.mcp import types
+from core.mcp.entities import RequestContext
+from core.mcp.session.base_session import RequestResponder
+from core.mcp.session.client_session import DEFAULT_CLIENT_INFO, ClientSession
+from core.mcp.types import (
+    LATEST_PROTOCOL_VERSION,
+    ClientNotification,
+    ClientRequest,
+    Implementation,
+    InitializedNotification,
+    InitializeRequest,
+    InitializeResult,
+    JSONRPCMessage,
+    JSONRPCNotification,
+    JSONRPCRequest,
+    JSONRPCResponse,
+    ServerCapabilities,
+    ServerResult,
+    SessionMessage,
+)
+
+
+def test_client_session_initialize():
+    # Create synchronous queues to replace async streams
+    client_to_server: queue.Queue[SessionMessage] = queue.Queue()
+    server_to_client: queue.Queue[SessionMessage] = queue.Queue()
+
+    initialized_notification = None
+
+    def mock_server():
+        nonlocal initialized_notification
+
+        # Receive initialization request
+        session_message = client_to_server.get(timeout=5.0)
+        jsonrpc_request = session_message.message
+        assert isinstance(jsonrpc_request.root, JSONRPCRequest)
+        request = ClientRequest.model_validate(
+            jsonrpc_request.root.model_dump(by_alias=True, mode="json", exclude_none=True)
+        )
+        assert isinstance(request.root, InitializeRequest)
+
+        # Create response
+        result = ServerResult(
+            InitializeResult(
+                protocolVersion=LATEST_PROTOCOL_VERSION,
+                capabilities=ServerCapabilities(
+                    logging=None,
+                    resources=None,
+                    tools=None,
+                    experimental=None,
+                    prompts=None,
+                ),
+                serverInfo=Implementation(name="mock-server", version="0.1.0"),
+                instructions="The server instructions.",
+            )
+        )
+
+        # Send response
+        server_to_client.put(
+            SessionMessage(
+                message=JSONRPCMessage(
+                    JSONRPCResponse(
+                        jsonrpc="2.0",
+                        id=jsonrpc_request.root.id,
+                        result=result.model_dump(by_alias=True, mode="json", exclude_none=True),
+                    )
+                )
+            )
+        )
+
+        # Receive initialized notification
+        session_notification = client_to_server.get(timeout=5.0)
+        jsonrpc_notification = session_notification.message
+        assert isinstance(jsonrpc_notification.root, JSONRPCNotification)
+        initialized_notification = ClientNotification.model_validate(
+            jsonrpc_notification.root.model_dump(by_alias=True, mode="json", exclude_none=True)
+        )
+
+    # Create message handler
+    def message_handler(
+        message: RequestResponder[types.ServerRequest, types.ClientResult] | types.ServerNotification | Exception,
+    ) -> None:
+        if isinstance(message, Exception):
+            raise message
+
+    # Start mock server thread
+    server_thread = threading.Thread(target=mock_server, daemon=True)
+    server_thread.start()
+
+    # Create and use client session
+    with ClientSession(
+        server_to_client,
+        client_to_server,
+        message_handler=message_handler,
+    ) as session:
+        result = session.initialize()
+
+    # Wait for server thread to complete
+    server_thread.join(timeout=10.0)
+
+    # Assert results
+    assert isinstance(result, InitializeResult)
+    assert result.protocolVersion == LATEST_PROTOCOL_VERSION
+    assert isinstance(result.capabilities, ServerCapabilities)
+    assert result.serverInfo == Implementation(name="mock-server", version="0.1.0")
+    assert result.instructions == "The server instructions."
+
+    # Check that client sent initialized notification
+    assert initialized_notification
+    assert isinstance(initialized_notification.root, InitializedNotification)
+
+
+def test_client_session_custom_client_info():
+    # Create synchronous queues to replace async streams
+    client_to_server: queue.Queue[SessionMessage] = queue.Queue()
+    server_to_client: queue.Queue[SessionMessage] = queue.Queue()
+
+    custom_client_info = Implementation(name="test-client", version="1.2.3")
+    received_client_info = None
+
+    def mock_server():
+        nonlocal received_client_info
+
+        session_message = client_to_server.get(timeout=5.0)
+        jsonrpc_request = session_message.message
+        assert isinstance(jsonrpc_request.root, JSONRPCRequest)
+        request = ClientRequest.model_validate(
+            jsonrpc_request.root.model_dump(by_alias=True, mode="json", exclude_none=True)
+        )
+        assert isinstance(request.root, InitializeRequest)
+        received_client_info = request.root.params.clientInfo
+
+        result = ServerResult(
+            InitializeResult(
+                protocolVersion=LATEST_PROTOCOL_VERSION,
+                capabilities=ServerCapabilities(),
+                serverInfo=Implementation(name="mock-server", version="0.1.0"),
+            )
+        )
+
+        server_to_client.put(
+            SessionMessage(
+                message=JSONRPCMessage(
+                    JSONRPCResponse(
+                        jsonrpc="2.0",
+                        id=jsonrpc_request.root.id,
+                        result=result.model_dump(by_alias=True, mode="json", exclude_none=True),
+                    )
+                )
+            )
+        )
+        # Receive initialized notification
+        client_to_server.get(timeout=5.0)
+
+    # Start mock server thread
+    server_thread = threading.Thread(target=mock_server, daemon=True)
+    server_thread.start()
+
+    with ClientSession(
+        server_to_client,
+        client_to_server,
+        client_info=custom_client_info,
+    ) as session:
+        session.initialize()
+
+    # Wait for server thread to complete
+    server_thread.join(timeout=10.0)
+
+    # Assert that custom client info was sent
+    assert received_client_info == custom_client_info
+
+
+def test_client_session_default_client_info():
+    # Create synchronous queues to replace async streams
+    client_to_server: queue.Queue[SessionMessage] = queue.Queue()
+    server_to_client: queue.Queue[SessionMessage] = queue.Queue()
+
+    received_client_info = None
+
+    def mock_server():
+        nonlocal received_client_info
+
+        session_message = client_to_server.get(timeout=5.0)
+        jsonrpc_request = session_message.message
+        assert isinstance(jsonrpc_request.root, JSONRPCRequest)
+        request = ClientRequest.model_validate(
+            jsonrpc_request.root.model_dump(by_alias=True, mode="json", exclude_none=True)
+        )
+        assert isinstance(request.root, InitializeRequest)
+        received_client_info = request.root.params.clientInfo
+
+        result = ServerResult(
+            InitializeResult(
+                protocolVersion=LATEST_PROTOCOL_VERSION,
+                capabilities=ServerCapabilities(),
+                serverInfo=Implementation(name="mock-server", version="0.1.0"),
+            )
+        )
+
+        server_to_client.put(
+            SessionMessage(
+                message=JSONRPCMessage(
+                    JSONRPCResponse(
+                        jsonrpc="2.0",
+                        id=jsonrpc_request.root.id,
+                        result=result.model_dump(by_alias=True, mode="json", exclude_none=True),
+                    )
+                )
+            )
+        )
+        # Receive initialized notification
+        client_to_server.get(timeout=5.0)
+
+    # Start mock server thread
+    server_thread = threading.Thread(target=mock_server, daemon=True)
+    server_thread.start()
+
+    with ClientSession(
+        server_to_client,
+        client_to_server,
+    ) as session:
+        session.initialize()
+
+    # Wait for server thread to complete
+    server_thread.join(timeout=10.0)
+
+    # Assert that default client info was used
+    assert received_client_info == DEFAULT_CLIENT_INFO
+
+
+def test_client_session_version_negotiation_success():
+    # Create synchronous queues to replace async streams
+    client_to_server: queue.Queue[SessionMessage] = queue.Queue()
+    server_to_client: queue.Queue[SessionMessage] = queue.Queue()
+
+    def mock_server():
+        session_message = client_to_server.get(timeout=5.0)
+        jsonrpc_request = session_message.message
+        assert isinstance(jsonrpc_request.root, JSONRPCRequest)
+        request = ClientRequest.model_validate(
+            jsonrpc_request.root.model_dump(by_alias=True, mode="json", exclude_none=True)
+        )
+        assert isinstance(request.root, InitializeRequest)
+
+        # Send supported protocol version
+        result = ServerResult(
+            InitializeResult(
+                protocolVersion=LATEST_PROTOCOL_VERSION,
+                capabilities=ServerCapabilities(),
+                serverInfo=Implementation(name="mock-server", version="0.1.0"),
+            )
+        )
+
+        server_to_client.put(
+            SessionMessage(
+                message=JSONRPCMessage(
+                    JSONRPCResponse(
+                        jsonrpc="2.0",
+                        id=jsonrpc_request.root.id,
+                        result=result.model_dump(by_alias=True, mode="json", exclude_none=True),
+                    )
+                )
+            )
+        )
+        # Receive initialized notification
+        client_to_server.get(timeout=5.0)
+
+    # Start mock server thread
+    server_thread = threading.Thread(target=mock_server, daemon=True)
+    server_thread.start()
+
+    with ClientSession(
+        server_to_client,
+        client_to_server,
+    ) as session:
+        result = session.initialize()
+
+    # Wait for server thread to complete
+    server_thread.join(timeout=10.0)
+
+    # Should successfully initialize
+    assert isinstance(result, InitializeResult)
+    assert result.protocolVersion == LATEST_PROTOCOL_VERSION
+
+
+def test_client_session_version_negotiation_failure():
+    # Create synchronous queues to replace async streams
+    client_to_server: queue.Queue[SessionMessage] = queue.Queue()
+    server_to_client: queue.Queue[SessionMessage] = queue.Queue()
+
+    def mock_server():
+        session_message = client_to_server.get(timeout=5.0)
+        jsonrpc_request = session_message.message
+        assert isinstance(jsonrpc_request.root, JSONRPCRequest)
+        request = ClientRequest.model_validate(
+            jsonrpc_request.root.model_dump(by_alias=True, mode="json", exclude_none=True)
+        )
+        assert isinstance(request.root, InitializeRequest)
+
+        # Send unsupported protocol version
+        result = ServerResult(
+            InitializeResult(
+                protocolVersion="99.99.99",  # Unsupported version
+                capabilities=ServerCapabilities(),
+                serverInfo=Implementation(name="mock-server", version="0.1.0"),
+            )
+        )
+
+        server_to_client.put(
+            SessionMessage(
+                message=JSONRPCMessage(
+                    JSONRPCResponse(
+                        jsonrpc="2.0",
+                        id=jsonrpc_request.root.id,
+                        result=result.model_dump(by_alias=True, mode="json", exclude_none=True),
+                    )
+                )
+            )
+        )
+
+    # Start mock server thread
+    server_thread = threading.Thread(target=mock_server, daemon=True)
+    server_thread.start()
+
+    with ClientSession(
+        server_to_client,
+        client_to_server,
+    ) as session:
+        import pytest
+
+        with pytest.raises(RuntimeError, match="Unsupported protocol version"):
+            session.initialize()
+
+    # Wait for server thread to complete
+    server_thread.join(timeout=10.0)
+
+
+def test_client_capabilities_default():
+    # Create synchronous queues to replace async streams
+    client_to_server: queue.Queue[SessionMessage] = queue.Queue()
+    server_to_client: queue.Queue[SessionMessage] = queue.Queue()
+
+    received_capabilities = None
+
+    def mock_server():
+        nonlocal received_capabilities
+
+        session_message = client_to_server.get(timeout=5.0)
+        jsonrpc_request = session_message.message
+        assert isinstance(jsonrpc_request.root, JSONRPCRequest)
+        request = ClientRequest.model_validate(
+            jsonrpc_request.root.model_dump(by_alias=True, mode="json", exclude_none=True)
+        )
+        assert isinstance(request.root, InitializeRequest)
+        received_capabilities = request.root.params.capabilities
+
+        result = ServerResult(
+            InitializeResult(
+                protocolVersion=LATEST_PROTOCOL_VERSION,
+                capabilities=ServerCapabilities(),
+                serverInfo=Implementation(name="mock-server", version="0.1.0"),
+            )
+        )
+
+        server_to_client.put(
+            SessionMessage(
+                message=JSONRPCMessage(
+                    JSONRPCResponse(
+                        jsonrpc="2.0",
+                        id=jsonrpc_request.root.id,
+                        result=result.model_dump(by_alias=True, mode="json", exclude_none=True),
+                    )
+                )
+            )
+        )
+        # Receive initialized notification
+        client_to_server.get(timeout=5.0)
+
+    # Start mock server thread
+    server_thread = threading.Thread(target=mock_server, daemon=True)
+    server_thread.start()
+
+    with ClientSession(
+        server_to_client,
+        client_to_server,
+    ) as session:
+        session.initialize()
+
+    # Wait for server thread to complete
+    server_thread.join(timeout=10.0)
+
+    # Assert default capabilities
+    assert received_capabilities is not None
+    assert received_capabilities.sampling is not None
+    assert received_capabilities.roots is not None
+    assert received_capabilities.roots.listChanged is True
+
+
+def test_client_capabilities_with_custom_callbacks():
+    # Create synchronous queues to replace async streams
+    client_to_server: queue.Queue[SessionMessage] = queue.Queue()
+    server_to_client: queue.Queue[SessionMessage] = queue.Queue()
+
+    def custom_sampling_callback(
+        context: RequestContext["ClientSession", Any],
+        params: types.CreateMessageRequestParams,
+    ) -> types.CreateMessageResult | types.ErrorData:
+        return types.CreateMessageResult(
+            model="test-model",
+            role="assistant",
+            content=types.TextContent(type="text", text="Custom response"),
+        )
+
+    def custom_list_roots_callback(
+        context: RequestContext["ClientSession", Any],
+    ) -> types.ListRootsResult | types.ErrorData:
+        return types.ListRootsResult(roots=[])
+
+    def mock_server():
+        session_message = client_to_server.get(timeout=5.0)
+        jsonrpc_request = session_message.message
+        assert isinstance(jsonrpc_request.root, JSONRPCRequest)
+        request = ClientRequest.model_validate(
+            jsonrpc_request.root.model_dump(by_alias=True, mode="json", exclude_none=True)
+        )
+        assert isinstance(request.root, InitializeRequest)
+
+        result = ServerResult(
+            InitializeResult(
+                protocolVersion=LATEST_PROTOCOL_VERSION,
+                capabilities=ServerCapabilities(),
+                serverInfo=Implementation(name="mock-server", version="0.1.0"),
+            )
+        )
+
+        server_to_client.put(
+            SessionMessage(
+                message=JSONRPCMessage(
+                    JSONRPCResponse(
+                        jsonrpc="2.0",
+                        id=jsonrpc_request.root.id,
+                        result=result.model_dump(by_alias=True, mode="json", exclude_none=True),
+                    )
+                )
+            )
+        )
+        # Receive initialized notification
+        client_to_server.get(timeout=5.0)
+
+    # Start mock server thread
+    server_thread = threading.Thread(target=mock_server, daemon=True)
+    server_thread.start()
+
+    with ClientSession(
+        server_to_client,
+        client_to_server,
+        sampling_callback=custom_sampling_callback,
+        list_roots_callback=custom_list_roots_callback,
+    ) as session:
+        result = session.initialize()
+
+    # Wait for server thread to complete
+    server_thread.join(timeout=10.0)
+
+    # Verify initialization succeeded
+    assert isinstance(result, InitializeResult)
+    assert result.protocolVersion == LATEST_PROTOCOL_VERSION

api/tests/unit_tests/core/mcp/client/test_sse.py

@@ -0,0 +1,349 @@
+import json
+import queue
+import threading
+import time
+from typing import Any
+from unittest.mock import Mock, patch
+
+import httpx
+import pytest
+
+from core.mcp import types
+from core.mcp.client.sse_client import sse_client
+from core.mcp.error import MCPAuthError, MCPConnectionError
+
+SERVER_NAME = "test_server_for_SSE"
+
+
+def test_sse_message_id_coercion():
+    """Test that string message IDs that look like integers are parsed as integers.
+
+    See <https://github.com/modelcontextprotocol/python-sdk/pull/851> for more details.
+    """
+    json_message = '{"jsonrpc": "2.0", "id": "123", "method": "ping", "params": null}'
+    msg = types.JSONRPCMessage.model_validate_json(json_message)
+    expected = types.JSONRPCMessage(root=types.JSONRPCRequest(method="ping", jsonrpc="2.0", id=123))
+
+    # Check if both are JSONRPCRequest instances
+    assert isinstance(msg.root, types.JSONRPCRequest)
+    assert isinstance(expected.root, types.JSONRPCRequest)
+
+    assert msg.root.id == expected.root.id
+    assert msg.root.method == expected.root.method
+    assert msg.root.jsonrpc == expected.root.jsonrpc
+
+
+class MockSSEClient:
+    """Mock SSE client for testing."""
+
+    def __init__(self, url: str, headers: dict[str, Any] | None = None):
+        self.url = url
+        self.headers = headers or {}
+        self.connected = False
+        self.read_queue: queue.Queue = queue.Queue()
+        self.write_queue: queue.Queue = queue.Queue()
+
+    def connect(self):
+        """Simulate connection establishment."""
+        self.connected = True
+
+        # Send endpoint event
+        endpoint_data = "/messages/?session_id=test-session-123"
+        self.read_queue.put(("endpoint", endpoint_data))
+
+        return self.read_queue, self.write_queue
+
+    def send_initialize_response(self):
+        """Send a mock initialize response."""
+        response = {
+            "jsonrpc": "2.0",
+            "id": 1,
+            "result": {
+                "protocolVersion": types.LATEST_PROTOCOL_VERSION,
+                "capabilities": {
+                    "logging": None,
+                    "resources": None,
+                    "tools": None,
+                    "experimental": None,
+                    "prompts": None,
+                },
+                "serverInfo": {"name": SERVER_NAME, "version": "0.1.0"},
+                "instructions": "Test server instructions.",
+            },
+        }
+        self.read_queue.put(("message", json.dumps(response)))
+
+
+def test_sse_client_message_id_handling():
+    """Test SSE client properly handles message ID coercion."""
+    mock_client = MockSSEClient("http://test.example/sse")
+    read_queue, write_queue = mock_client.connect()
+
+    # Send a message with string ID that should be coerced to int
+    message_data = {
+        "jsonrpc": "2.0",
+        "id": "456",  # String ID
+        "result": {"test": "data"},
+    }
+    read_queue.put(("message", json.dumps(message_data)))
+    read_queue.get(timeout=1.0)
+    # Get the message from queue
+    event_type, data = read_queue.get(timeout=1.0)
+    assert event_type == "message"
+
+    # Parse the message
+    parsed_message = types.JSONRPCMessage.model_validate_json(data)
+    # Check that it's a JSONRPCResponse and verify the ID
+    assert isinstance(parsed_message.root, types.JSONRPCResponse)
+    assert parsed_message.root.id == 456  # Should be converted to int
+
+
+def test_sse_client_connection_validation():
+    """Test SSE client validates endpoint URLs properly."""
+    test_url = "http://test.example/sse"
+
+    with patch("core.mcp.client.sse_client.create_ssrf_proxy_mcp_http_client") as mock_client_factory:
+        with patch("core.mcp.client.sse_client.ssrf_proxy_sse_connect") as mock_sse_connect:
+            # Mock the HTTP client
+            mock_client = Mock()
+            mock_client_factory.return_value.__enter__.return_value = mock_client
+
+            # Mock the SSE connection
+            mock_event_source = Mock()
+            mock_event_source.response.raise_for_status.return_value = None
+            mock_sse_connect.return_value.__enter__.return_value = mock_event_source
+
+            # Mock SSE events
+            class MockSSEEvent:
+                def __init__(self, event_type: str, data: str):
+                    self.event = event_type
+                    self.data = data
+
+            # Simulate endpoint event
+            endpoint_event = MockSSEEvent("endpoint", "/messages/?session_id=test-123")
+            mock_event_source.iter_sse.return_value = [endpoint_event]
+
+            # Test connection
+            try:
+                with sse_client(test_url) as (read_queue, write_queue):
+                    assert read_queue is not None
+                    assert write_queue is not None
+            except Exception as e:
+                # Connection might fail due to mocking, but we're testing the validation logic
+                pass
+
+
+def test_sse_client_error_handling():
+    """Test SSE client properly handles various error conditions."""
+    test_url = "http://test.example/sse"
+
+    # Test 401 error handling
+    with patch("core.mcp.client.sse_client.create_ssrf_proxy_mcp_http_client") as mock_client_factory:
+        with patch("core.mcp.client.sse_client.ssrf_proxy_sse_connect") as mock_sse_connect:
+            # Mock 401 HTTP error
+            mock_error = httpx.HTTPStatusError("Unauthorized", request=Mock(), response=Mock(status_code=401))
+            mock_sse_connect.side_effect = mock_error
+
+            with pytest.raises(MCPAuthError):
+                with sse_client(test_url):
+                    pass
+
+    # Test other HTTP errors
+    with patch("core.mcp.client.sse_client.create_ssrf_proxy_mcp_http_client") as mock_client_factory:
+        with patch("core.mcp.client.sse_client.ssrf_proxy_sse_connect") as mock_sse_connect:
+            # Mock other HTTP error
+            mock_error = httpx.HTTPStatusError("Server Error", request=Mock(), response=Mock(status_code=500))
+            mock_sse_connect.side_effect = mock_error
+
+            with pytest.raises(MCPConnectionError):
+                with sse_client(test_url):
+                    pass
+
+
+def test_sse_client_timeout_configuration():
+    """Test SSE client timeout configuration."""
+    test_url = "http://test.example/sse"
+    custom_timeout = 10.0
+    custom_sse_timeout = 300.0
+    custom_headers = {"Authorization": "Bearer test-token"}
+
+    with patch("core.mcp.client.sse_client.create_ssrf_proxy_mcp_http_client") as mock_client_factory:
+        with patch("core.mcp.client.sse_client.ssrf_proxy_sse_connect") as mock_sse_connect:
+            # Mock successful connection
+            mock_client = Mock()
+            mock_client_factory.return_value.__enter__.return_value = mock_client
+
+            mock_event_source = Mock()
+            mock_event_source.response.raise_for_status.return_value = None
+            mock_event_source.iter_sse.return_value = []
+            mock_sse_connect.return_value.__enter__.return_value = mock_event_source
+
+            try:
+                with sse_client(
+                    test_url, headers=custom_headers, timeout=custom_timeout, sse_read_timeout=custom_sse_timeout
+                ) as (read_queue, write_queue):
+                    # Verify the configuration was passed correctly
+                    mock_client_factory.assert_called_with(headers=custom_headers)
+
+                    # Check that timeout was configured
+                    call_args = mock_sse_connect.call_args
+                    assert call_args is not None
+                    timeout_arg = call_args[1]["timeout"]
+                    assert timeout_arg.read == custom_sse_timeout
+            except Exception:
+                # Connection might fail due to mocking, but we tested the configuration
+                pass
+
+
+def test_sse_transport_endpoint_validation():
+    """Test SSE transport validates endpoint URLs correctly."""
+    from core.mcp.client.sse_client import SSETransport
+
+    transport = SSETransport("http://example.com/sse")
+
+    # Valid endpoint (same origin)
+    valid_endpoint = "http://example.com/messages/session123"
+    assert transport._validate_endpoint_url(valid_endpoint) == True
+
+    # Invalid endpoint (different origin)
+    invalid_endpoint = "http://malicious.com/messages/session123"
+    assert transport._validate_endpoint_url(invalid_endpoint) == False
+
+    # Invalid endpoint (different scheme)
+    invalid_scheme = "https://example.com/messages/session123"
+    assert transport._validate_endpoint_url(invalid_scheme) == False
+
+
+def test_sse_transport_message_parsing():
+    """Test SSE transport properly parses different message types."""
+    from core.mcp.client.sse_client import SSETransport
+
+    transport = SSETransport("http://example.com/sse")
+    read_queue: queue.Queue = queue.Queue()
+
+    # Test valid JSON-RPC message
+    valid_message = '{"jsonrpc": "2.0", "id": 1, "method": "ping"}'
+    transport._handle_message_event(valid_message, read_queue)
+
+    # Should have a SessionMessage in the queue
+    message = read_queue.get(timeout=1.0)
+    assert message is not None
+    assert hasattr(message, "message")
+
+    # Test invalid JSON
+    invalid_json = '{"invalid": json}'
+    transport._handle_message_event(invalid_json, read_queue)
+
+    # Should have an exception in the queue
+    error = read_queue.get(timeout=1.0)
+    assert isinstance(error, Exception)
+
+
+def test_sse_client_queue_cleanup():
+    """Test that SSE client properly cleans up queues on exit."""
+    test_url = "http://test.example/sse"
+
+    read_queue = None
+    write_queue = None
+
+    with patch("core.mcp.client.sse_client.create_ssrf_proxy_mcp_http_client") as mock_client_factory:
+        with patch("core.mcp.client.sse_client.ssrf_proxy_sse_connect") as mock_sse_connect:
+            # Mock connection that raises an exception
+            mock_sse_connect.side_effect = Exception("Connection failed")
+
+            try:
+                with sse_client(test_url) as (rq, wq):
+                    read_queue = rq
+                    write_queue = wq
+            except Exception:
+                pass  # Expected to fail
+
+            # Queues should be cleaned up even on exception
+            # Note: In real implementation, cleanup should put None to signal shutdown
+
+
+def test_sse_client_url_processing():
+    """Test SSE client URL processing functions."""
+    from core.mcp.client.sse_client import remove_request_params
+
+    # Test URL with parameters
+    url_with_params = "http://example.com/sse?param1=value1&param2=value2"
+    cleaned_url = remove_request_params(url_with_params)
+    assert cleaned_url == "http://example.com/sse"
+
+    # Test URL without parameters
+    url_without_params = "http://example.com/sse"
+    cleaned_url = remove_request_params(url_without_params)
+    assert cleaned_url == "http://example.com/sse"
+
+    # Test URL with path and parameters
+    complex_url = "http://example.com/path/to/sse?session=123&token=abc"
+    cleaned_url = remove_request_params(complex_url)
+    assert cleaned_url == "http://example.com/path/to/sse"
+
+
+def test_sse_client_headers_propagation():
+    """Test that custom headers are properly propagated in SSE client."""
+    test_url = "http://test.example/sse"
+    custom_headers = {
+        "Authorization": "Bearer test-token",
+        "X-Custom-Header": "test-value",
+        "User-Agent": "test-client/1.0",
+    }
+
+    with patch("core.mcp.client.sse_client.create_ssrf_proxy_mcp_http_client") as mock_client_factory:
+        with patch("core.mcp.client.sse_client.ssrf_proxy_sse_connect") as mock_sse_connect:
+            # Mock the client factory to capture headers
+            mock_client = Mock()
+            mock_client_factory.return_value.__enter__.return_value = mock_client
+
+            # Mock the SSE connection
+            mock_event_source = Mock()
+            mock_event_source.response.raise_for_status.return_value = None
+            mock_event_source.iter_sse.return_value = []
+            mock_sse_connect.return_value.__enter__.return_value = mock_event_source
+
+            try:
+                with sse_client(test_url, headers=custom_headers):
+                    pass
+            except Exception:
+                pass  # Expected due to mocking
+
+            # Verify headers were passed to client factory
+            mock_client_factory.assert_called_with(headers=custom_headers)
+
+
+def test_sse_client_concurrent_access():
+    """Test SSE client behavior with concurrent queue access."""
+    test_read_queue: queue.Queue = queue.Queue()
+
+    # Simulate concurrent producers and consumers
+    def producer():
+        for i in range(10):
+            test_read_queue.put(f"message_{i}")
+            time.sleep(0.01)  # Small delay to simulate real conditions
+
+    def consumer():
+        received = []
+        for _ in range(10):
+            try:
+                msg = test_read_queue.get(timeout=2.0)
+                received.append(msg)
+            except queue.Empty:
+                break
+        return received
+
+    # Start producer in separate thread
+    producer_thread = threading.Thread(target=producer, daemon=True)
+    producer_thread.start()
+
+    # Consume messages
+    received_messages = consumer()
+
+    # Wait for producer to finish
+    producer_thread.join(timeout=5.0)
+
+    # Verify all messages were received
+    assert len(received_messages) == 10
+    for i in range(10):
+        assert f"message_{i}" in received_messages

api/tests/unit_tests/core/mcp/client/test_streamable_http.py

@@ -0,0 +1,450 @@
+"""
+Tests for the StreamableHTTP client transport.
+
+Contains tests for only the client side of the StreamableHTTP transport.
+"""
+
+import queue
+import threading
+import time
+from typing import Any
+from unittest.mock import Mock, patch
+
+from core.mcp import types
+from core.mcp.client.streamable_client import streamablehttp_client
+
+# Test constants
+SERVER_NAME = "test_streamable_http_server"
+TEST_SESSION_ID = "test-session-id-12345"
+INIT_REQUEST = {
+    "jsonrpc": "2.0",
+    "method": "initialize",
+    "params": {
+        "clientInfo": {"name": "test-client", "version": "1.0"},
+        "protocolVersion": "2025-03-26",
+        "capabilities": {},
+    },
+    "id": "init-1",
+}
+
+
+class MockStreamableHTTPClient:
+    """Mock StreamableHTTP client for testing."""
+
+    def __init__(self, url: str, headers: dict[str, Any] | None = None):
+        self.url = url
+        self.headers = headers or {}
+        self.connected = False
+        self.read_queue: queue.Queue = queue.Queue()
+        self.write_queue: queue.Queue = queue.Queue()
+        self.session_id = TEST_SESSION_ID
+
+    def connect(self):
+        """Simulate connection establishment."""
+        self.connected = True
+        return self.read_queue, self.write_queue, lambda: self.session_id
+
+    def send_initialize_response(self):
+        """Send a mock initialize response."""
+        session_message = types.SessionMessage(
+            message=types.JSONRPCMessage(
+                root=types.JSONRPCResponse(
+                    jsonrpc="2.0",
+                    id="init-1",
+                    result={
+                        "protocolVersion": types.LATEST_PROTOCOL_VERSION,
+                        "capabilities": {
+                            "logging": None,
+                            "resources": None,
+                            "tools": None,
+                            "experimental": None,
+                            "prompts": None,
+                        },
+                        "serverInfo": {"name": SERVER_NAME, "version": "0.1.0"},
+                        "instructions": "Test server instructions.",
+                    },
+                )
+            )
+        )
+        self.read_queue.put(session_message)
+
+    def send_tools_response(self):
+        """Send a mock tools list response."""
+        session_message = types.SessionMessage(
+            message=types.JSONRPCMessage(
+                root=types.JSONRPCResponse(
+                    jsonrpc="2.0",
+                    id="tools-1",
+                    result={
+                        "tools": [
+                            {
+                                "name": "test_tool",
+                                "description": "A test tool",
+                                "inputSchema": {"type": "object", "properties": {}},
+                            }
+                        ],
+                    },
+                )
+            )
+        )
+        self.read_queue.put(session_message)
+
+
+def test_streamablehttp_client_message_id_handling():
+    """Test StreamableHTTP client properly handles message ID coercion."""
+    mock_client = MockStreamableHTTPClient("http://test.example/mcp")
+    read_queue, write_queue, get_session_id = mock_client.connect()
+
+    # Send a message with string ID that should be coerced to int
+    response_message = types.SessionMessage(
+        message=types.JSONRPCMessage(root=types.JSONRPCResponse(jsonrpc="2.0", id="789", result={"test": "data"}))
+    )
+    read_queue.put(response_message)
+
+    # Get the message from queue
+    message = read_queue.get(timeout=1.0)
+    assert message is not None
+    assert isinstance(message, types.SessionMessage)
+
+    # Check that the ID was properly handled
+    assert isinstance(message.message.root, types.JSONRPCResponse)
+    assert message.message.root.id == 789  # ID should be coerced to int due to union_mode="left_to_right"
+
+
+def test_streamablehttp_client_connection_validation():
+    """Test StreamableHTTP client validates connections properly."""
+    test_url = "http://test.example/mcp"
+
+    with patch("core.mcp.client.streamable_client.create_ssrf_proxy_mcp_http_client") as mock_client_factory:
+        # Mock the HTTP client
+        mock_client = Mock()
+        mock_client_factory.return_value.__enter__.return_value = mock_client
+
+        # Mock successful response
+        mock_response = Mock()
+        mock_response.status_code = 200
+        mock_response.headers = {"content-type": "application/json"}
+        mock_response.raise_for_status.return_value = None
+        mock_client.post.return_value = mock_response
+
+        # Test connection
+        try:
+            with streamablehttp_client(test_url) as (read_queue, write_queue, get_session_id):
+                assert read_queue is not None
+                assert write_queue is not None
+                assert get_session_id is not None
+        except Exception:
+            # Connection might fail due to mocking, but we're testing the validation logic
+            pass
+
+
+def test_streamablehttp_client_timeout_configuration():
+    """Test StreamableHTTP client timeout configuration."""
+    test_url = "http://test.example/mcp"
+    custom_headers = {"Authorization": "Bearer test-token"}
+
+    with patch("core.mcp.client.streamable_client.create_ssrf_proxy_mcp_http_client") as mock_client_factory:
+        # Mock successful connection
+        mock_client = Mock()
+        mock_client_factory.return_value.__enter__.return_value = mock_client
+
+        mock_response = Mock()
+        mock_response.status_code = 200
+        mock_response.headers = {"content-type": "application/json"}
+        mock_response.raise_for_status.return_value = None
+        mock_client.post.return_value = mock_response
+
+        try:
+            with streamablehttp_client(test_url, headers=custom_headers) as (read_queue, write_queue, get_session_id):
+                # Verify the configuration was passed correctly
+                mock_client_factory.assert_called_with(headers=custom_headers)
+        except Exception:
+            # Connection might fail due to mocking, but we tested the configuration
+            pass
+
+
+def test_streamablehttp_client_session_id_handling():
+    """Test StreamableHTTP client properly handles session IDs."""
+    mock_client = MockStreamableHTTPClient("http://test.example/mcp")
+    read_queue, write_queue, get_session_id = mock_client.connect()
+
+    # Test that session ID is available
+    session_id = get_session_id()
+    assert session_id == TEST_SESSION_ID
+
+    # Test that we can use the session ID in subsequent requests
+    assert session_id is not None
+    assert len(session_id) > 0
+
+
+def test_streamablehttp_client_message_parsing():
+    """Test StreamableHTTP client properly parses different message types."""
+    mock_client = MockStreamableHTTPClient("http://test.example/mcp")
+    read_queue, write_queue, get_session_id = mock_client.connect()
+
+    # Test valid initialization response
+    mock_client.send_initialize_response()
+
+    # Should have a SessionMessage in the queue
+    message = read_queue.get(timeout=1.0)
+    assert message is not None
+    assert isinstance(message, types.SessionMessage)
+    assert isinstance(message.message.root, types.JSONRPCResponse)
+
+    # Test tools response
+    mock_client.send_tools_response()
+
+    tools_message = read_queue.get(timeout=1.0)
+    assert tools_message is not None
+    assert isinstance(tools_message, types.SessionMessage)
+
+
+def test_streamablehttp_client_queue_cleanup():
+    """Test that StreamableHTTP client properly cleans up queues on exit."""
+    test_url = "http://test.example/mcp"
+
+    read_queue = None
+    write_queue = None
+
+    with patch("core.mcp.client.streamable_client.create_ssrf_proxy_mcp_http_client") as mock_client_factory:
+        # Mock connection that raises an exception
+        mock_client_factory.side_effect = Exception("Connection failed")
+
+        try:
+            with streamablehttp_client(test_url) as (rq, wq, get_session_id):
+                read_queue = rq
+                write_queue = wq
+        except Exception:
+            pass  # Expected to fail
+
+        # Queues should be cleaned up even on exception
+        # Note: In real implementation, cleanup should put None to signal shutdown
+
+
+def test_streamablehttp_client_headers_propagation():
+    """Test that custom headers are properly propagated in StreamableHTTP client."""
+    test_url = "http://test.example/mcp"
+    custom_headers = {
+        "Authorization": "Bearer test-token",
+        "X-Custom-Header": "test-value",
+        "User-Agent": "test-client/1.0",
+    }
+
+    with patch("core.mcp.client.streamable_client.create_ssrf_proxy_mcp_http_client") as mock_client_factory:
+        # Mock the client factory to capture headers
+        mock_client = Mock()
+        mock_client_factory.return_value.__enter__.return_value = mock_client
+
+        mock_response = Mock()
+        mock_response.status_code = 200
+        mock_response.headers = {"content-type": "application/json"}
+        mock_response.raise_for_status.return_value = None
+        mock_client.post.return_value = mock_response
+
+        try:
+            with streamablehttp_client(test_url, headers=custom_headers):
+                pass
+        except Exception:
+            pass  # Expected due to mocking
+
+        # Verify headers were passed to client factory
+        # Check that the call was made with headers that include our custom headers
+        mock_client_factory.assert_called_once()
+        call_args = mock_client_factory.call_args
+        assert "headers" in call_args.kwargs
+        passed_headers = call_args.kwargs["headers"]
+
+        # Verify all custom headers are present
+        for key, value in custom_headers.items():
+            assert key in passed_headers
+            assert passed_headers[key] == value
+
+
+def test_streamablehttp_client_concurrent_access():
+    """Test StreamableHTTP client behavior with concurrent queue access."""
+    test_read_queue: queue.Queue = queue.Queue()
+    test_write_queue: queue.Queue = queue.Queue()
+
+    # Simulate concurrent producers and consumers
+    def producer():
+        for i in range(10):
+            test_read_queue.put(f"message_{i}")
+            time.sleep(0.01)  # Small delay to simulate real conditions
+
+    def consumer():
+        received = []
+        for _ in range(10):
+            try:
+                msg = test_read_queue.get(timeout=2.0)
+                received.append(msg)
+            except queue.Empty:
+                break
+        return received
+
+    # Start producer in separate thread
+    producer_thread = threading.Thread(target=producer, daemon=True)
+    producer_thread.start()
+
+    # Consume messages
+    received_messages = consumer()
+
+    # Wait for producer to finish
+    producer_thread.join(timeout=5.0)
+
+    # Verify all messages were received
+    assert len(received_messages) == 10
+    for i in range(10):
+        assert f"message_{i}" in received_messages
+
+
+def test_streamablehttp_client_json_vs_sse_mode():
+    """Test StreamableHTTP client handling of JSON vs SSE response modes."""
+    test_url = "http://test.example/mcp"
+
+    with patch("core.mcp.client.streamable_client.create_ssrf_proxy_mcp_http_client") as mock_client_factory:
+        mock_client = Mock()
+        mock_client_factory.return_value.__enter__.return_value = mock_client
+
+        # Mock JSON response
+        mock_json_response = Mock()
+        mock_json_response.status_code = 200
+        mock_json_response.headers = {"content-type": "application/json"}
+        mock_json_response.json.return_value = {"result": "json_mode"}
+        mock_json_response.raise_for_status.return_value = None
+
+        # Mock SSE response
+        mock_sse_response = Mock()
+        mock_sse_response.status_code = 200
+        mock_sse_response.headers = {"content-type": "text/event-stream"}
+        mock_sse_response.raise_for_status.return_value = None
+
+        # Test JSON mode
+        mock_client.post.return_value = mock_json_response
+
+        try:
+            with streamablehttp_client(test_url) as (read_queue, write_queue, get_session_id):
+                # Should handle JSON responses
+                assert read_queue is not None
+                assert write_queue is not None
+        except Exception:
+            pass  # Expected due to mocking
+
+        # Test SSE mode
+        mock_client.post.return_value = mock_sse_response
+
+        try:
+            with streamablehttp_client(test_url) as (read_queue, write_queue, get_session_id):
+                # Should handle SSE responses
+                assert read_queue is not None
+                assert write_queue is not None
+        except Exception:
+            pass  # Expected due to mocking
+
+
+def test_streamablehttp_client_terminate_on_close():
+    """Test StreamableHTTP client terminate_on_close parameter."""
+    test_url = "http://test.example/mcp"
+
+    with patch("core.mcp.client.streamable_client.create_ssrf_proxy_mcp_http_client") as mock_client_factory:
+        mock_client = Mock()
+        mock_client_factory.return_value.__enter__.return_value = mock_client
+
+        mock_response = Mock()
+        mock_response.status_code = 200
+        mock_response.headers = {"content-type": "application/json"}
+        mock_response.raise_for_status.return_value = None
+        mock_client.post.return_value = mock_response
+        mock_client.delete.return_value = mock_response
+
+        # Test with terminate_on_close=True (default)
+        try:
+            with streamablehttp_client(test_url, terminate_on_close=True) as (read_queue, write_queue, get_session_id):
+                pass
+        except Exception:
+            pass  # Expected due to mocking
+
+        # Test with terminate_on_close=False
+        try:
+            with streamablehttp_client(test_url, terminate_on_close=False) as (read_queue, write_queue, get_session_id):
+                pass
+        except Exception:
+            pass  # Expected due to mocking
+
+
+def test_streamablehttp_client_protocol_version_handling():
+    """Test StreamableHTTP client protocol version handling."""
+    mock_client = MockStreamableHTTPClient("http://test.example/mcp")
+    read_queue, write_queue, get_session_id = mock_client.connect()
+
+    # Send initialize response with specific protocol version
+
+    session_message = types.SessionMessage(
+        message=types.JSONRPCMessage(
+            root=types.JSONRPCResponse(
+                jsonrpc="2.0",
+                id="init-1",
+                result={
+                    "protocolVersion": "2024-11-05",
+                    "capabilities": {},
+                    "serverInfo": {"name": SERVER_NAME, "version": "0.1.0"},
+                },
+            )
+        )
+    )
+    read_queue.put(session_message)
+
+    # Get the message and verify protocol version
+    message = read_queue.get(timeout=1.0)
+    assert message is not None
+    assert isinstance(message.message.root, types.JSONRPCResponse)
+    result = message.message.root.result
+    assert result["protocolVersion"] == "2024-11-05"
+
+
+def test_streamablehttp_client_error_response_handling():
+    """Test StreamableHTTP client handling of error responses."""
+    mock_client = MockStreamableHTTPClient("http://test.example/mcp")
+    read_queue, write_queue, get_session_id = mock_client.connect()
+
+    # Send an error response
+    session_message = types.SessionMessage(
+        message=types.JSONRPCMessage(
+            root=types.JSONRPCError(
+                jsonrpc="2.0",
+                id="test-1",
+                error=types.ErrorData(code=-32601, message="Method not found", data=None),
+            )
+        )
+    )
+    read_queue.put(session_message)
+
+    # Get the error message
+    message = read_queue.get(timeout=1.0)
+    assert message is not None
+    assert isinstance(message.message.root, types.JSONRPCError)
+    assert message.message.root.error.code == -32601
+    assert message.message.root.error.message == "Method not found"
+
+
+def test_streamablehttp_client_resumption_token_handling():
+    """Test StreamableHTTP client resumption token functionality."""
+    test_url = "http://test.example/mcp"
+    test_resumption_token = "resume-token-123"
+
+    with patch("core.mcp.client.streamable_client.create_ssrf_proxy_mcp_http_client") as mock_client_factory:
+        mock_client = Mock()
+        mock_client_factory.return_value.__enter__.return_value = mock_client
+
+        mock_response = Mock()
+        mock_response.status_code = 200
+        mock_response.headers = {"content-type": "application/json", "last-event-id": test_resumption_token}
+        mock_response.raise_for_status.return_value = None
+        mock_client.post.return_value = mock_response
+
+        try:
+            with streamablehttp_client(test_url) as (read_queue, write_queue, get_session_id):
+                # Test that resumption token can be captured from headers
+                assert read_queue is not None
+                assert write_queue is not None
+        except Exception:
+            pass  # Expected due to mocking

api/uv.lock

@@ -99,28 +99,29 @@ wheels = [
 
 [[package]]
 name = "aiosignal"
-version = "1.3.2"
+version = "1.4.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "frozenlist" },
+    { name = "typing-extensions" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/ba/b5/6d55e80f6d8a08ce22b982eafa278d823b541c925f11ee774b0b9c43473d/aiosignal-1.3.2.tar.gz", hash = "sha256:a8c255c66fafb1e499c9351d0bf32ff2d8a0321595ebac3b93713656d2436f54", size = 19424, upload-time = "2024-12-13T17:10:40.86Z" }
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docker/nginx/conf.d/default.conf.template

@@ -39,7 +39,10 @@ server {
       proxy_pass http://web:3000;
       include proxy.conf;
     }
-
+    location /mcp {
+      proxy_pass http://api:5001;
+      include proxy.conf;
+    }
     # placeholder for acme challenge location
     ${ACME_CHALLENGE_LOCATION}