Scope rule

• Execute exactly one task per session by default.
• If multi-task execution is requested, confirm explicit human approval.

Mandatory implementation stop

• Before writing or modifying any code, pause and prompt the user.
• The prompt must explain:
  • task goal
  • boundaries (in/out of scope)
  • done checks
  • expected files/components to change
  • key approach, trade-offs, and risks
• Then ask explicitly whether to continue.
• Do not edit files, generate code, or apply patches until the user confirms.

Example mandatory stop prompt:

Task goal: Add input validation to the user registration endpoint.
In scope: src/routes/register.ts, src/validators/user.ts
Out of scope: Auth logic, database schema, frontend forms
Done checks: All existing tests pass; new validation tests cover empty/invalid email and short passwords
Expected changes: ~2 files modified, no new dependencies
Approach: Use the existing `validateSchema` helper; add a Zod schema for registration payload
Trade-offs: Zod adds minor overhead; keeps validation consistent with other routes
Risks: Existing callers that omit optional fields may start failing validation

Continue with implementation now? (yes/no)

Required sequence

1. Restate task goal, boundaries, done checks, and expected file touch scope.
2. Propose approach, trade-offs, and risks.
3. Stop and ask: "Continue with implementation now?" (yes/no).
4. Implement minimal in-scope changes.
5. Run light task-level tests/checks and lints first, and run a build when the build is light/fast (targeted over full-suite unless requested), then capture evidence.
6. Record whether the implementation is an important change for context sync (root-edit required) or verify-only (no root edits expected).
7. Keep session-only scraps in context/tmp/.
8. Update task status in context/plans/{plan_id}.md.

Example task status update (context/plans/{plan_id}.md):

## Task: Add input validation to registration endpoint
- **Status:** done
- **Completed:** 2025-06-10
- **Files changed:** src/routes/register.ts, src/validators/user.ts
- **Evidence:** 14/14 tests passed, lint clean, build succeeded (12s)
- **Notes:** Zod schema added; no breaking changes to existing callers

Scope expansion rule

• If out-of-scope edits are needed, stop and ask for approval.