{"record":{"id":"7f5aa63fbbda15d9","repo":"langflow-ai/langflow","slug":"project-mcp-server-disconnected-error-e","errorCode":null,"errorMessage":"Project MCP Server disconnected, error: {e}","messagePattern":"Project MCP Server disconnected, error: (.+?)","errorType":"http","errorClass":"HTTPException","httpStatus":404,"severity":"error","filePath":"src/backend/base/langflow/api/v1/mcp_projects.py","lineNumber":472,"sourceCode":"\n\nasync def _handle_project_sse_messages(\n    project_id: UUID,\n    request: Request,\n    current_user: User,\n):\n    \"\"\"Handle POST messages for a project-specific MCP server using SSE transport.\"\"\"\n    user_token = current_user_ctx.set(current_user)\n    project_token = current_project_ctx.set(project_id)\n    variables = extract_global_variables_from_headers(request.headers, include_auth_headers=True)\n    req_vars_token = current_request_variables_ctx.set(variables or None)\n\n    try:\n        sse = get_project_sse(project_id)\n        await sse.handle_post_message(request.scope, request.receive, request._send)  # noqa: SLF001\n    except BrokenResourceError as e:\n        await logger.ainfo(\"Project MCP Server disconnected for project %s\", project_id)\n        raise HTTPException(status_code=404, detail=f\"Project MCP Server disconnected, error: {e}\") from e\n    finally:\n        current_user_ctx.reset(user_token)\n        current_project_ctx.reset(project_token)\n        current_request_variables_ctx.reset(req_vars_token)\n\n\n@router.post(\n    \"/{project_id}\",\n    dependencies=[Depends(raise_error_if_astra_cloud_env)],\n    include_in_schema=False,\n)\n@router.post(\n    \"/{project_id}/\",\n    dependencies=[Depends(raise_error_if_astra_cloud_env)],\n    include_in_schema=False,\n)\nasync def handle_project_messages(\n    project_id: UUID,","sourceCodeStart":454,"sourceCodeEnd":490,"githubUrl":"https://github.com/langflow-ai/langflow/blob/976ec789d2886a86de109c044d089d68e96c9a35/src/backend/base/langflow/api/v1/mcp_projects.py#L454-L490","documentation":"Error \"Project MCP Server disconnected, error: {e}\" thrown in langflow-ai/langflow.","triggerScenarios":"Occurs when the project MCP server connection drops with an error during an active session.","commonSituations":"See trigger scenarios.","solutions":["Reconnect the MCP client; check that the project's MCP server process is still running and review its logs."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"976ec789d2886a86de109c044d089d68e96c9a35","analyzedAt":"2026-08-14T18:23:12.227Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}