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Migration Diary: Stamp Idempotency Keys on Tools Before You Leave a Paid Agent

This story is from 2026-09-12. It is preserved in the archive; the latest stories are on the live feed.

Paid agent runtimes retry mutating tools after timeouts, dropped streams, and loop restarts, and they often hide those retries from you. You should stamp an idempotency key on every side-effecting tool before you leave that paid loop. The leftover after cutover is not a missing system prompt; it is…

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  1. 2026-09-12 18:36 · DEV Community — AI
    Migration Diary: Stamp Idempotency Keys on Tools Before You Leave a Paid Agent

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