# Idempotency

> Safe retries with idempotency keys and stable external ids.

Product: Clad API
Source: https://docs.useclad.ai/api/idempotency

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For issue creation, set `idempotencyKey` (or a stable `externalId`) on
`CreateIssueInput`. Retrying with the same key returns the **original** issue
instead of creating a duplicate — safe for at-least-once delivery from your
systems.