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Claude 400: Fix tool_use Without a Matching tool_result

This story is from 2026-09-15. It is preserved in the archive; the latest stories are on the live feed.

A Claude error stating that tool_use has no matching tool_result typically indicates a structural conversation problem rather than a prompt issue. In the native Messages API, the assistant calls a client tool and the following user message should return the result with the matching ID. Verify this…

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  1. 2026-09-15 04:33 · DEV Community — AI
    Claude 400: Fix tool_use Without a Matching tool_result

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