{"record":{"id":"5482e52b062231a6","repo":"bytedance/deer-flow","slug":"failed-to-get-thread-state","errorCode":null,"errorMessage":"Failed to get thread state","messagePattern":"Failed to get thread state","errorType":"http","errorClass":"HTTPException","httpStatus":500,"severity":"error","filePath":"backend/app/gateway/routers/threads.py","lineNumber":1208,"sourceCode":"\n# ---------------------------------------------------------------------------\n@router.get(\"/{thread_id}/state\", response_model=ThreadStateResponse)\n@require_permission(\"threads\", \"read\", owner_check=True)\nasync def get_thread_state(thread_id: ThreadId, request: Request) -> ThreadStateResponse:\n    \"\"\"Get the latest materialized graph state for a thread.\"\"\"\n    # Resolve through the thread's assistant so custom middleware channels\n    # appear in the response instead of being dropped by the default schema.\n    try:\n        accessor, config = await build_thread_checkpoint_state_accessor(request, thread_id=thread_id)\n    except _CHECKPOINT_MODE_ERRORS as exc:\n        raise _checkpoint_mode_http_error(exc, thread_id) from exc\n    try:\n        snapshot = await accessor.aget(config)\n    except _CHECKPOINT_MODE_ERRORS as exc:\n        raise _checkpoint_mode_http_error(exc, thread_id) from exc\n    except Exception:\n        logger.exception(\"Failed to get state for thread %s\", sanitize_log_param(thread_id))\n        raise HTTPException(status_code=500, detail=\"Failed to get thread state\")\n\n    snapshot_config = snapshot.config or {}\n    checkpoint_id = snapshot_config.get(\"configurable\", {}).get(\"checkpoint_id\")\n    if not checkpoint_id:\n        raise HTTPException(status_code=404, detail=f\"Thread {thread_id} not found\")\n\n    parent_config = snapshot.parent_config or {}\n    parent_checkpoint_id = parent_config.get(\"configurable\", {}).get(\"checkpoint_id\")\n    metadata = snapshot.metadata or {}\n    created_at = snapshot.created_at or metadata.get(\"created_at\", \"\")\n    tasks_raw = snapshot.tasks or ()\n    tasks = [{\"id\": getattr(task, \"id\", \"\"), \"name\": getattr(task, \"name\", \"\")} for task in tasks_raw]\n\n    return ThreadStateResponse(\n        values=serialize_channel_values_for_api(snapshot.values),\n        next=list(snapshot.next or ()),\n        metadata=metadata,\n        checkpoint={\"id\": checkpoint_id, \"ts\": coerce_iso(created_at)},","sourceCodeStart":1190,"sourceCodeEnd":1226,"githubUrl":"https://github.com/bytedance/deer-flow/blob/1dd6ba1acb03700589994b0366c5d1c7d05e2eff/backend/app/gateway/routers/threads.py#L1190-L1226","documentation":"Error \"Failed to get thread state\" thrown in bytedance/deer-flow.","triggerScenarios":"Thrown at backend/app/gateway/routers/threads.py:1208 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Check the Gateway logs for the underlying state read error.","Verify the thread exists and checkpoint storage is reachable, then retry."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"1dd6ba1acb03700589994b0366c5d1c7d05e2eff","analyzedAt":"2026-08-14T21:20:34.804Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}