fix mcp import

.circleci/config.yml

@@ -1062,7 +1062,6 @@ jobs:
             pip install jinja2
             pip install "tokenizers==0.20.0"
             pip install "uvloop==0.21.0"
-            pip install "mcp==1.5.0"
             pip install jsonschema
       - run:
           name: Run tests

litellm/proxy/_experimental/mcp_server/server.py

@@ -3,43 +3,55 @@ LiteLLM MCP Server Routes
 """
 
 import asyncio
+import logging
 from typing import Any, Dict, List, Union
 
 from anyio import BrokenResourceError
 from fastapi import APIRouter, HTTPException, Request
 from fastapi.responses import StreamingResponse
-from mcp.server import NotificationOptions, Server
-from mcp.server.models import InitializationOptions
-from mcp.types import EmbeddedResource as MCPEmbeddedResource
-from mcp.types import ImageContent as MCPImageContent
-from mcp.types import TextContent as MCPTextContent
-from mcp.types import Tool as MCPTool
 from pydantic import ValidationError
 
 from litellm._logging import verbose_logger
-from litellm.proxy._experimental.mcp_server.tool_registry import (
-    global_mcp_tool_registry,
-)
 
-from .sse_transport import SseServerTransport
+# Check if MCP is available
+# "mcp" requires python 3.10 or higher, but several litellm users use python 3.8
+# We're making this conditional import to avoid breaking users who use python 3.8.
+try:
+    import mcp
 
-########################################################
-############ Initialize the MCP Server #################
-########################################################
-router = APIRouter(
+    MCP_AVAILABLE = True
+except ImportError as e:
+    verbose_logger.debug(f"MCP module not found: {e}")
+    MCP_AVAILABLE = False
+
+
+if MCP_AVAILABLE:
+    from mcp.server import NotificationOptions, Server
+    from mcp.server.models import InitializationOptions
+    from mcp.types import EmbeddedResource as MCPEmbeddedResource
+    from mcp.types import ImageContent as MCPImageContent
+    from mcp.types import TextContent as MCPTextContent
+    from mcp.types import Tool as MCPTool
+
+    from .sse_transport import SseServerTransport
+    from .tool_registry import global_mcp_tool_registry
+
+    ########################################################
+    ############ Initialize the MCP Server #################
+    ########################################################
+    router = APIRouter(
         prefix="/mcp",
         tags=["mcp"],
-)
-server: Server = Server("litellm-mcp-server")
-sse: SseServerTransport = SseServerTransport("/mcp/sse/messages")
+    )
+    server: Server = Server("litellm-mcp-server")
+    sse: SseServerTransport = SseServerTransport("/mcp/sse/messages")
 
-########################################################
-############### MCP Server Routes #######################
-########################################################
+    ########################################################
+    ############### MCP Server Routes #######################
+    ########################################################
 
-
-@server.list_tools()
-async def list_tools() -> list[MCPTool]:
+    @server.list_tools()
+    async def list_tools() -> list[MCPTool]:
         """
         List all available tools
         """
@@ -55,11 +67,10 @@ async def list_tools() -> list[MCPTool]:
 
         return tools
 
-
-@server.call_tool()
-async def handle_call_tool(
+    @server.call_tool()
+    async def handle_call_tool(
         name: str, arguments: Dict[str, Any] | None
-) -> List[Union[MCPTextContent, MCPImageContent, MCPEmbeddedResource]]:
+    ) -> List[Union[MCPTextContent, MCPImageContent, MCPEmbeddedResource]]:
         """
         Call a specific tool with the provided arguments
         """
@@ -67,7 +78,9 @@ async def handle_call_tool(
         if not tool:
             raise HTTPException(status_code=404, detail=f"Tool '{name}' not found")
         if arguments is None:
-        raise HTTPException(status_code=400, detail="Request arguments are required")
+            raise HTTPException(
+                status_code=400, detail="Request arguments are required"
+            )
 
         try:
             result = tool.handler(**arguments)
@@ -75,9 +88,8 @@ async def handle_call_tool(
         except Exception as e:
             return [MCPTextContent(text=f"Error: {str(e)}", type="text")]
 
-
-@router.get("/", response_class=StreamingResponse)
-async def handle_sse(request: Request):
+    @router.get("/", response_class=StreamingResponse)
+    async def handle_sse(request: Request):
         verbose_logger.info("new incoming SSE connection established")
         async with sse.connect_sse(request) as streams:
             try:
@@ -92,19 +104,17 @@ async def handle_sse(request: Request):
                 raise
         await request.close()
 
-
-@router.post("/sse/messages")
-async def handle_messages(request: Request):
+    @router.post("/sse/messages")
+    async def handle_messages(request: Request):
         verbose_logger.info("incoming SSE message received")
         await sse.handle_post_message(request.scope, request.receive, request._send)
         await request.close()
 
-
-options = InitializationOptions(
+    options = InitializationOptions(
         server_name="litellm-mcp-server",
         server_version="0.1.0",
         capabilities=server.get_capabilities(
             notification_options=NotificationOptions(),
             experimental_capabilities={},
         ),
-)
+    )