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Can't enable "LANGCHAIN_TRACING_V2" to do tracing in Hierarchical Agent Teams example #94

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opened 2026-02-15 17:15:42 -05:00 by yindo · 8 comments
yindo commented 2026-02-15 17:15:42 -05:00
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Originally created by @timeff on GitHub (Sep 25, 2024).

Hi, I am building the application using a hierarchical agent team. But when I enable the "LANGCHAIN_TRACING_V2" environment variable to send the data to the langsmith. I got the error

Error: Key team_members not found in channels
    at validateKeys (/Users/xxx/Lab/langchain-hierarchy-supervisor/node_modules/@langchain/langgraph/dist/pregel/validate.cjs:84:23)
    at CompiledStateGraph._defaults (/Users/xxx/Lab/langchain-hierarchy-supervisor/node_modules/@langchain/langgraph/dist/pregel/index.cjs:400:44)
    at CompiledStateGraph._streamIterator (/Users/xxx/Lab/langchain-hierarchy-supervisor/node_modules/@langchain/langgraph/dist/pregel/index.cjs:517:112)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
  pregelTaskId: '2aa7cc38-a59e-5593-8b06-2b6963bc24fd'

At first, I thought it might be a problem with my application. But I created a new project and try copy and paste anything from the official tutorial at https://langchain-ai.github.io/langgraphjs/tutorials/multi_agent/hierarchical_agent_teams/. It turned out the same error happened again.

I can disable tracing by putting the environment variable to false but it will lose all of the tracing capability using langsmith.

Originally created by @timeff on GitHub (Sep 25, 2024). Hi, I am building the application using a hierarchical agent team. But when I enable the "LANGCHAIN_TRACING_V2" environment variable to send the data to the langsmith. I got the error ``` Error: Key team_members not found in channels at validateKeys (/Users/xxx/Lab/langchain-hierarchy-supervisor/node_modules/@langchain/langgraph/dist/pregel/validate.cjs:84:23) at CompiledStateGraph._defaults (/Users/xxx/Lab/langchain-hierarchy-supervisor/node_modules/@langchain/langgraph/dist/pregel/index.cjs:400:44) at CompiledStateGraph._streamIterator (/Users/xxx/Lab/langchain-hierarchy-supervisor/node_modules/@langchain/langgraph/dist/pregel/index.cjs:517:112) at process.processTicksAndRejections (node:internal/process/task_queues:95:5) { pregelTaskId: '2aa7cc38-a59e-5593-8b06-2b6963bc24fd' ``` At first, I thought it might be a problem with my application. But I created a new project and try copy and paste anything from the official tutorial at https://langchain-ai.github.io/langgraphjs/tutorials/multi_agent/hierarchical_agent_teams/. It turned out the same error happened again. I can disable tracing by putting the environment variable to false but it will lose all of the tracing capability using langsmith.
yindo closed this issue 2026-02-15 17:15:42 -05:00
yindo commented 2026-02-15 17:15:42 -05:00
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@lemonps commented on GitHub (Sep 25, 2024):

I have the same problem. Anyone know the solution?

@lemonps commented on GitHub (Sep 25, 2024): I have the same problem. Anyone know the solution?
yindo commented 2026-02-15 17:15:43 -05:00
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@jacoblee93 commented on GitHub (Sep 28, 2024):

Very weird - will investigate!

@jacoblee93 commented on GitHub (Sep 28, 2024): Very weird - will investigate!
yindo commented 2026-02-15 17:15:43 -05:00
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@rpatel15-hue commented on GitHub (Oct 3, 2024):

same issue for me, I wonder if it has to do with the way state is defined in the subgraphs

@rpatel15-hue commented on GitHub (Oct 3, 2024): same issue for me, I wonder if it has to do with the way state is defined in the subgraphs
yindo commented 2026-02-15 17:15:43 -05:00
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@Pdash-exceeds commented on GitHub (Oct 9, 2024):

Same issue, works for subgraphs. Not for supergraph

@Pdash-exceeds commented on GitHub (Oct 9, 2024): Same issue, works for subgraphs. Not for supergraph
yindo commented 2026-02-15 17:15:43 -05:00
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@nross83 commented on GitHub (Nov 7, 2024):

I just converted my single graph into hierarchical subgraphs and ran into this bug. This is unfortunate because LangSmith tracing is important for our team, but we also really don't want to go back to a single graph again 😕

@nross83 commented on GitHub (Nov 7, 2024): I just converted my single graph into hierarchical subgraphs and ran into this bug. This is unfortunate because LangSmith tracing is important for our team, but we also really don't want to go back to a single graph again 😕
yindo commented 2026-02-15 17:15:43 -05:00
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@jacoblee93 commented on GitHub (Nov 7, 2024):

Hey all, sorry for the delay - will look into it

@jacoblee93 commented on GitHub (Nov 7, 2024): Hey all, sorry for the delay - will look into it
yindo commented 2026-02-15 17:15:43 -05:00
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@phpmac commented on GitHub (Mar 13, 2025):

hello

@phpmac commented on GitHub (Mar 13, 2025): hello
yindo commented 2026-02-15 17:15:43 -05:00
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@dqbd commented on GitHub (Sep 11, 2025):

Hello! We're in the process of rewriting our examples, closing this issue for staleness

@dqbd commented on GitHub (Sep 11, 2025): Hello! We're in the process of rewriting our examples, closing this issue for staleness
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Reference: langchain-ai/langgraphjs#94
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