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Why Your LangGraph ToolNode Tests Are Failing (And How to Fix Them)

This story is from 2026-09-09. It is preserved in the archive; the latest stories are on the live feed.

You wrote a clean unit test for your LangGraph tool. It worked fine for months. Then you upgraded your dependencies and got this: ValueError: Missing required config key 'N/A' for 'tools'. Or maybe: TypeError: custom_afunc() got an unexpected keyword argument 'runtime' Or your tests pass silently w…

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  1. 2026-09-09 04:39 · DEV Community — AI
    Why Your LangGraph ToolNode Tests Are Failing (And How to Fix Them)

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