# Idempotent Endpoint

> Scaffold idempotency-key handling for unsafe POSTs — read an Idempotency-Key header, replay the stored response on a retry instead of re-processing, otherwise process once and store the response keyed by (key, request fingerprint). Ships a servlet filter plus a storage SPI the project implements with Redis or a DB. Trigger phrases: "idempotency key", "idempotent endpoint", "make POST idempotent", "safe retries", "exactly-once POST", "dedupe requests".

## Facts
- Page: https://tashan.sh/capability/skill-shipwithai-idempotent-endpoint
- tashan id: skill:ShipWithAI/idempotent-endpoint
- Source: https://github.com/ShipWithAI/shipwithai-plugins
- Type: skill
- Category: other
- tashan score: not scored (catalogued only — too little public evidence)
- Adoption: 9.0
- Upkeep: 99.0
- Freshness: 98.0
- Evidence coverage: 84% of the inputs this score can use
- Health: active
- Instruction depth: not yet graded
- License: MIT
- Official: no

## Install

```sh
cp -r idempotent-endpoint ~/.claude/skills/
```

## Security audit
Not scanned. We audit npm-published capabilities; this one has no npm package we can resolve, or has not reached the queue. This is not a clean bill of health.

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Measured 2026-08-14 by tashan (https://tashan.sh) from public evidence. Scorer s5.