Fix MCP server transport initialization by mounting mcp.sse_app

mcp_server.py

@@ -261,7 +261,7 @@ async def list_documents_for_ui(limit: int = 100, offset: int = 0) -> Dict[str,
 
 # Blaxel Deployment Support
 from fastapi import FastAPI
-from mcp.server.streamable_http import StreamableHTTPServerTransport
+# from mcp.server.streamable_http import StreamableHTTPServerTransport
 import os
 
 # Get Blaxel environment variables
@@ -271,14 +271,9 @@ port = int(os.getenv("BL_SERVER_PORT", "8000"))
 # Create FastAPI app
 app = FastAPI()
 
-# Initialize HTTP transport instead of stdio
-transport = StreamableHTTPServerTransport()
-
-# Connect MCP server to HTTP transport
-mcp.connect(transport)
-
-# Mount transport to FastAPI
-transport.mount(app)
+# Mount FastMCP SSE app to FastAPI
+# This exposes the MCP server at /sse
+app.mount("/sse", mcp.sse_app)
 
 @app.get("/health")
 async def health_check():