idempotency
Idempotent API Operations
Safely handle retries without duplicate side effects.
When to Use This Skill
- Payment processing (charges, refunds)
- Order creation and fulfillment
- Any operation with side effects
- APIs that may be retried by clients
- Webhook handlers
What is Idempotency?
An operation is idempotent if executing it multiple times produces the same result as executing it once.
Request 1: POST /orders {item: "book"} → Order #123 created
Request 2: POST /orders {item: "book"} → Order #123 returned (not #124)
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