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ToolNode doesn't support custom state classes #181

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opened 2026-02-20 17:30:37 -05:00 by yindo · 1 comment
yindo commented 2026-02-20 17:30:37 -05:00
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Originally created by @nfcampos on GitHub (Aug 11, 2024).

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  • I am a LangChain maintainer, or was asked directly by a LangChain maintainer to create an issue here.

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I also realized I added a get method to the state class because ToolNode assumes your state is a TypedDict. This may also be another issue, but I haven't looked into it yet. In any case, I left the logging to show when it's accessing messages.

First reported in https://github.com/langchain-ai/langgraph-studio/issues/66

Originally created by @nfcampos on GitHub (Aug 11, 2024). ### Privileged issue - [X] I am a LangChain maintainer, or was asked directly by a LangChain maintainer to create an issue here. ### Issue Content >I also realized I added a get method to the state class because ToolNode assumes your state is a TypedDict. This may also be another issue, but I haven't looked into it yet. In any case, I left the logging to show when it's accessing messages. First reported in https://github.com/langchain-ai/langgraph-studio/issues/66
yindo closed this issue 2026-02-20 17:30:39 -05:00
yindo commented 2026-02-20 17:30:41 -05:00
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@hinthornw commented on GitHub (Sep 6, 2024):

Mostly resolved in https://github.com/langchain-ai/langgraph/pull/1625

(though assumes your custom state can coerce from dict)

@hinthornw commented on GitHub (Sep 6, 2024): Mostly resolved in https://github.com/langchain-ai/langgraph/pull/1625 (though assumes your custom state can coerce from dict)
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Reference: langchain-ai/langgraph#181
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