Inventory breaking and additive availability-contract changes
The proposed response renames fields and changes unknown stock from null to zero.
- Focused work estimate
- 1h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- API compatibility
Estimated field mix
- API design100%
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 inventory platform must replace a legacy availability response. Existing partners upgrade on different schedules, and the team needs a versioned transition.
Setup prerequisites
- Create two local API versions and synthetic partner clients with different upgrade schedules; no real partner traffic.
Preceding work
No earlier ticket is required. Complete the project setup above.
Acceptance criteria
- Classify each request and response change.
- Preserve unknown versus zero semantics.
- Identify supported legacy behavior explicitly.
Implementation constraints
- Use actual local contract examples rather than general compatibility slogans.
Verification to include
- Classify an optional additive field.
- Flag a meaning-changing null-to-zero conversion.
Deliverables
- Contract change inventory.
Rollout and recovery
Review the inventory before choosing a versioning approach.
Value of the work
For the engineer: Practice public-contract design, compatible evolution, and client lifecycle management.
For the team: Provide a predictable migration that keeps supported integrations inspectable and recoverable.
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.