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Idempotency Keys Are a Product Contract: A Case Study of an Agent-Written Export Job API

This story is from 2026-09-23. It is preserved in the archive; the latest stories are on the live feed.

You should treat idempotency keys as a product contract, not as an implementation detail an agent can improvise. A side-effecting POST that creates export jobs will duplicate work whenever clients retry after a timeout. This case study walks a small export-job API from frozen rules through tests, a…

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  1. 2026-09-23 17:03 · DEV Community — AI
    Idempotency Keys Are a Product Contract: A Case Study of an Agent-Written Export Job API

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