Create environments through idempotent provider operations
A create timeout produces two environments for the same review.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Provider design · Idempotency
Estimated field mix
- Cloud infrastructure50%
- Distributed systems50%
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 product team creates preview environments for pull requests. Forgotten environments accumulate cost, and shared test data leaks between reviews.
Setup prerequisites
- Author a local environment-provider double and synthetic pull-request events; provision no external resources.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Persist a stable operation identity before dispatch.
- Adopt matching provider resources after retry.
- Reject conflicting provider ownership metadata.
Implementation constraints
- Use explicit provider interfaces and local doubles.
Verification to include
- Recover after an accepted create loses its response.
- Detect an existing resource owned by another review.
Deliverables
- Idempotent provision coordinator.
Rollout and recovery
Keep uncertain creates pending until reconciliation.
Value of the work
For the engineer: Practice resource lifecycle state machines, isolation, and reconciliation.
For the team: Make review environments predictable, isolated, and accountable to a budget.
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.