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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- Last checked
- Nov 11, 2026
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- Aug 16, 2026
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- MIT
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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