Inventory the fields each fulfillment consumer actually reads
The existing contract copies entire sample responses, making harmless changes fail.
- Focused work estimate
- 1h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Contract testing
Estimated field mix
- Quality engineering60%
- API design40%
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
No earlier ticket is required. Complete the project setup above.
Acceptance criteria
- List fields and semantics used by each consumer.
- Distinguish optional fields from required decisions.
- Identify one response field neither consumer needs.
Implementation constraints
- Use synthetic consumers rather than production traffic.
Verification to include
- Trace checkout and warehouse reads.
- Remove an unused field without changing the consumer outcome.
Deliverables
- Consumer expectation inventory.
Rollout and recovery
Review scope before creating strict assertions.
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.