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LangChain Forum - Topics tagged langsmith-studio

Production use of PostgresSaver: service-owned migrations and checkpoint retention in Node.js AttributeError: 'AsyncSandboxClient' object has no attribute 'get_template' reasoning_content visible in LangSmith when using langgraph up but not in standalone Python Unable to delete runs from annotation queue Incorrect `reasoning_effort` options in the UI Unexpected latency in minimal Deep Agent setup (create_deep_agent) + confusing @traceable runs LangSmith Studio file upload with Deep Agents causing OpenAI 400 error Why can't my 'langgraph cli' load 'checkpointer' Langsmith Stream Issues How to use another model in the langsmith Agent Builder UI? # [Bug/Question] Runtime Context Not Working in Deployed LangSmith Agent - Headers and Config Stripped Alert notifications not triggering for tag-based Parallel Test Scenarios vs OpenAI Rate Limits Unplanned triggering of “PII detection” when launching the agent in self-hosted LangSmith Studio can't connect to self-hosted LangGraph server on Railway - "origin is not allowed" POSTGRES_URI_CUSTOM is ignored by LangGraph runtime; runtime always falls back to in-memory Langsmith Studio not showing state schema Image registration issue Manager graph does not get the header despite adding the custom heade in langgraph.json Feedback request: LangGraph + Laravel workflow to auto-fill form fields from a PDF diagram Local server setup failed LangGraph CLI treats InjectedState as required tool parameter and fails the validation Support passing runtime context in Send API InvalidUpdateError: Node __copy__ does not exist - LangGraph State Update Failure Does langGraph-studio not support user custom type? How to get the Original Tool Call Output in the agent? How to Pass Runtime Data from SDK to LangGraph Nodes Without Polluting State? Question: Custom datasets inside LangGraph platform DBs How can I properly integrate open-deep-research package to my existing backend? Studio not recognizing my custom inputs
TypeError: Type is not JSON serializable: ProxyUser
2026-02-19 · via LangChain Forum - Topics tagged langsmith-studio

Hi Team Im running my langgraph agent in the langgraph platform. Im using a deployment in langsmith which deploys my agent straight from GitHub.. After my last deployment im getting this error TypeError('Type is not JSON serializable: ProxyUser')Traceback (most recent call last): File "/usr/local/lib/python3.11/site-packages/langgraph/pregel/main.py", line 2891, in astream async with AsyncPregelLoop( File "/usr/local/lib/python3.11/site-packages/langgraph/pregel/_loop.py", line 12...

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