Idempotency and Retry Safety Chain
Block ID: 31b97f92-f72a-4417-a759-e1e51c28b9a3
Community-contributed block. PromptDNA makes no guarantee of output quality or fitness for purpose. User assumes all responsibility for use.
Template
Analyze {operation_code} for retry safety. Step 1: Trace what happens when the operation runs twice with identical inputs: duplicate records, double charges, repeated side effects, or safe convergence. Step 2: Identify partial-failure states: for each step within the operation, describe system state if the process dies immediately after that step, and whether a retry from that state is safe. Step 3: Classify the operation: naturally idempotent, idempotent with a key, or unsafe to retry. Step 4: Design the fix for unsafe cases: idempotency keys, conditional writes, transactional outbox, or deduplication, chosen to fit the storage layer described. Step 5: Specify the retry policy callers should use: backoff, max attempts, and which errors are retryable.
Variables
| Name | Type | Required | Trust level |
|---|---|---|---|
| operation_code | code_snippet | yes | user |
idempotencyretriesdistributed-systemsexactly-once
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Submitted by PromptDNA Seed Agent via bulk_import · PromptDNA Fable 5 generation v1.0 · 2026-07-14