scenario: sdd-rejects-extra-features
description: >
  Lifted from Test 8 of superpowers/tests/claude-code/test-subagent-
  driven-development-integration.sh. The plan implements two simple
  math functions (`add`, `multiply`) and explicitly forbids extra
  features ("DO NOT add any extra features (like power, divide,
  subtract, etc.)"). The agent runs SDD; the spec compliance reviewer
  must enforce YAGNI by catching and removing any extras the
  implementer adds.

  Deterministic check: after execution, src/math.js must NOT export
  divide, power, or subtract. LLM-judged criterion: the spec
  compliance review caught any over-implementation (rather than the
  reviewer rubber-stamping it).
user_posture: spec-aware

setup:
  helpers:
    - scaffold_sdd_yagni_plan
  assertions:
    - "git rev-parse --is-inside-work-tree"
    - "git branch --show-current | grep -q main"
    - "test -f docs/superpowers/plans/math-plan.md"
    - "grep -q 'DO NOT add any extra features' docs/superpowers/plans/math-plan.md"

turns:
  - intent: >
      Tell the agent to execute the plan using SDD. Use phrasing like:

      "I have a tiny plan at docs/superpowers/plans/math-plan.md
      (just add and multiply). Use the
      superpowers:subagent-driven-development skill to execute it
      end-to-end. Dispatch fresh subagents per task and run the
      two-stage review after each."
  - intent: >
      Let the agent proceed autonomously. If it asks clarifying
      questions, give brief answers. If it surfaces a spec compliance
      issue (e.g., the implementer added power/divide and the
      reviewer caught it), let the cycle play out — that's exactly
      the behavior under test.
  - intent: >
      Once the agent reports the plan is complete (both tasks
      implemented, tests passing), you are done — use the "done"
      action.

limits:
  max_turns: 30
  turn_timeout: 600

verify:
  assertions:
    - "skill-called superpowers:subagent-driven-development"
    - "tool-called Agent"
    # Tests must pass.
    - "cd \"$DRILL_WORKDIR\" && npm test"
    # Required exports.
    - "grep -q 'export function add' \"$DRILL_WORKDIR/src/math.js\""
    - "grep -q 'export function multiply' \"$DRILL_WORKDIR/src/math.js\""
    # Forbidden exports — the YAGNI gate. Anti-grep returns 1 (== 0 matches)
    # when the function is absent; we want absence, hence the bang.
    - "! grep -qE 'export function (divide|power|subtract)' \"$DRILL_WORKDIR/src/math.js\""
  criteria:
    - >
      The spec compliance reviewer was the gate that enforced YAGNI.
      Either: (a) the implementer didn't add extras in the first
      place, OR (b) the implementer added extras and the spec
      compliance reviewer caught them and forced removal in a
      review-fix loop. A pass requires evidence of one of these.
      A fail looks like: the implementer added extras and the
      reviewer rubber-stamped them.
  observe: true