Individual skill

check-idempotency

Analyzes PHP code for idempotency issues. Detects missing idempotency keys on POST/PUT endpoints, non-idempotent command handlers, duplicate write risks, and retry-unsafe operations.

skills/check-idempotency/SKILL.md

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# Idempotency Check

Analyze PHP code for idempotency violations that can cause duplicate writes, double charges, or inconsistent state on retries.

## Detection Patterns

### 1. Missing Idempotency Key on POST/PUT Endpoints

```php
<?php

declare(strict_types=1);

// BAD: POST endpoint creates resource without deduplication
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