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Exactly-Once: Your agent shouldn't pay the same invoice twice

This story is from 2026-08-30. It is preserved in the archive; the latest stories are on the live feed.

Wrap the payment. It runs once across retries, crashes, resumes, and replays. exactly-once is a Python library that makes a side effect run a single time. Wrap the function that pays an invoice or sends an email, or submits a transaction and it executes once per key, then replays its stored result…

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  1. 2026-08-30 12:15 · DEV Community — AI
    Exactly-Once: Your agent shouldn't pay the same invoice twice

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