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Claude Invalid Signature in Thinking Block: What to Check

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

When Claude reports an invalid signature in a thinking block, inspect the structured conversation you sent back. Preserve the original thinking block and its signature rather than reconstructing it from displayed text. If the error explicitly mentions a different conversation, also inspect changes…

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  1. 2026-09-15 02:43 · DEV Community — AI
    Claude Invalid Signature in Thinking Block: What to Check

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