App slice

Use when

• A user-visible feature touches more than one layer.
• The approach needs a decision that a human must approve.

Do not use when

• The change is in one area and is clear. Use single-ticket.
• The work is a new product or many features. Use full-project.

Flow

1. Run the shaper with the human until the ticket meets the Definition of Ready (G1). The ticket names the personas that the slice serves.
2. Start the planner in a fresh session. It writes the plan artifact and the progress file. The plan maps each acceptance criterion to a job story. If the slice changes a behavior, the planner also writes the spec delta (see Specs).
3. The progress file lists each task with its acceptance test steps. Each task starts with passes: false.
4. A human reads the plan and approves it (G2). The human edits the plan, not the code.
5. For each task in the progress file:
6. Start the implementer in a fresh session. It does one task and updates the decision log.
7. Start the tester in a fresh session. It writes the acceptance tests from the job stories, and the integration tests for the task.
8. Run the checks (G3). If they pass, set passes: true for the task.
9. Start the reviewer in a fresh session. It compares the diff with the plan and reports scope drift.
10. Run stone spec apply <id> if the plan has a spec delta. Commit its output alone, with Role: generator. Open one PR for each group of tasks that stays under the size limit.
11. A human approves each PR (G4).

Exit criteria

• All tasks in the progress file have passes: true.
• Acceptance tests run the feature end to end, as the persona does.
• Each acceptance criterion maps to a job story, and K18 passes.
• The spec delta is applied, and K19 passes.
• Fitness checks (K8) pass.

Failure handling

Failure	Action
The build needs a change that the plan does not have	Stop. Update the plan. Get G2 again for the change.
An end-to-end test cannot run in CI	Record a waiver. Add a manual verify step to the PR.
Scope drift in the review	Remove the extra change, or add it to a new ticket.

Evidence

Dossier IDs: B8, B9, C3, D2, D9, D10, D12, D13, E2, E3, E4, E8.