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langgraph-supervisor package, sometimes returns empty string as response from supervisor #288

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opened 2026-02-15 18:15:30 -05:00 by yindo · 1 comment
yindo commented 2026-02-15 18:15:30 -05:00
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Originally created by @saravanaraja25 on GitHub (Jun 18, 2025).

Hi all,

I've been using @langchain/langgraph-supervisor for one of my use cases that needs a supervisor/orchestrator, so sometimes when I invoke this supervisor agent for complex queries or invocations that have 2-3 messages in the history, it returns an empty string. Is anyone else facing the same kind of issues?

Thanks

Originally created by @saravanaraja25 on GitHub (Jun 18, 2025). Hi all, I've been using @langchain/langgraph-supervisor for one of my use cases that needs a supervisor/orchestrator, so sometimes when I invoke this supervisor agent for complex queries or invocations that have 2-3 messages in the history, it returns an empty string. Is anyone else facing the same kind of issues? Thanks
yindo added the bug label 2026-02-15 18:15:30 -05:00
yindo closed this issue 2026-02-15 18:15:30 -05:00
yindo commented 2026-02-15 18:15:31 -05:00
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@dqbd commented on GitHub (Sep 11, 2025):

Hello! Closing this since there's no MRE, feel free to create a new issue if it still persists.

Further hints to look out for:

  • Do supervisor AI messages contain any tool calls? Or is it only hallucinating handoffs?
  • Was a checkpointer passed when compiling the graph? Or is the history manually managed from outside?
  • How is the graph invoked? Is it possible that the graph is being invoked from an incorrect checkpoint?
@dqbd commented on GitHub (Sep 11, 2025): Hello! Closing this since there's no MRE, feel free to create a new issue if it still persists. Further hints to look out for: - Do supervisor AI messages contain any tool calls? Or is it only hallucinating handoffs? - Was a checkpointer passed when compiling the graph? Or is the history manually managed from outside? - How is the graph invoked? Is it possible that the graph is being invoked from an incorrect checkpoint?
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Reference: langchain-ai/langgraphjs#288
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