Retried or redelivered work is idempotent or deduplicated
rel-006
Intent
Prevent duplicate charges, duplicate jobs, repeated mutations, and overlapping work when retries or queue redelivery happen.
Applicability
Applies to non-idempotent API operations, jobs, queue consumers, and retried distributed work.
What to inspect
Idempotency keys, deduplication stores, transactional guards, overlap locks, and side-effect boundaries.
Pass criteria
The operation is intrinsically idempotent or the diff adds visible deduplication or overlap prevention.
Fail criteria
The diff introduces retried or redelivered side effects with no deduplication, transactional guard, or overlap control.
Do not flag
Pure reads and deterministic recomputation with no external side effects.
Confidence guidance
HIGH when duplicate side effects are directly visible. MEDIUM when deduplication may exist in shared infrastructure. LOW when operation ownership is incomplete.
Remediation
Add idempotency keys, dedupe state, resource-level overlap guards, or transactional fences around side effects.
Pass example
INSERT INTO payments(idempotency_key, charge_id) VALUES (?, ?)
Fail example
perform_charge(order_id)