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Your Agent Will Call the Same Tool Twice. Make Side-Effecting Tools Idempotent

Here's a bug I keep seeing in agent code: a tool call times out, the framework retries, and the customer gets two refunds . Or two emails. Or two tickets. The model didn't do anything wrong. The tool did exactly what it was told, twice. The fix isn't a better prompt. It's a decades-old backend patt…

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  1. 2026-11-09 09:20 · DEV Community — AI
    Your Agent Will Call the Same Tool Twice. Make Side-Effecting Tools Idempotent

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