Cover retry semantics for conflicts and transient failures
Both clients currently retry every failed write, including conflicting requests.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- HTTP semantics · Idempotency
Estimated field mix
- Quality engineering50%
- API design30%
- Distributed systems20%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional fulfillment API serves a web checkout and warehouse adapter. Provider tests pass while consumers fail on subtle response and error changes.
Setup prerequisites
- Author two small local consumers and one mock provider with versioned synthetic responses.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Distinguish conflict, validation, and transient errors.
- Specify which writes are safely retryable.
- Preserve request identity across allowed retries.
Implementation constraints
- Use a deterministic mock clock and bounded retry count.
Verification to include
- Recover from one transient error.
- Verify validation and conflicting idempotency reuse are not retried.
Deliverables
- Error and retry contract suite.
Rollout and recovery
Adopt new error handling with the provider behavior unchanged.
Value of the work
For the engineer: Practice executable contracts, meaningful negative tests, and compatibility triage.
For the team: Expose integration regressions before deployment without requiring every system to run together.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.