AC Verification Skill

Purpose: Verify implemented code meets acceptance criteria (AC) defined in user stories Trigger: Called by validation-phase or /audit after code implementation Input: User stories with AC, implemented files, test suite Output: {verified, results[], unmet_criteria[]}

Workflow Steps

1. Extract Acceptance Criteria

For each user story (US-NNN):

1. Read story file (extract AC list)
2. Parse AC checkbox format: - [x] (complete) or - [ ] (incomplete)
3. Record AC text and current status
4. Note associated implementation files/tests

2. Verify Each Criterion

For each AC in the story:

a. Code Inspection:

1. Check if referenced file exists
2. Check if referenced function/class exists
3. Verify property/method signatures match AC description
4. If file missing → Record as UNMET

b. Test Execution:

1. Locate test file (standard: __tests__/{filename}.test.{ts,js} or .spec.{ts,js})
2. Run test suite: pnpm test --run {test_file}
3. Parse test results:
   • All tests passing → Record as PASSED
   • Tests failing → Record as FAILED + error details
   • No tests found → Proceed to manual check

c. Manual Check Prompts:

For UI/UX or non-automatable criteria:

1. Ask user: "Verify AC: {ac_text}"
2. User response: yes/no/skip
3. Record response + timestamp

3. Aggregate Results

Compile per-story verification:

{
  "story_id": "US-001",
  "title": "User Authentication",
  "ac_total": 4,
  "ac_passed": 3,
  "ac_failed": 1,
  "ac_results": [
    {
      "criterion": "User can login with email + password",
      "status": "pass",
      "method": "test_execution",
      "test_file": "src/__tests__/auth.test.ts",
      "tests_passed": 2
    },
    {
      "criterion": "Invalid credentials rejected",
      "status": "fail",
      "method": "test_execution",
      "error": "Test 'Invalid credentials' failed: expected 401"
    },
    {
      "criterion": "Login button is visible on mobile",
      "status": "pending",
      "method": "manual_check",
      "prompt_sent": true
    }
  ]
}

4. Overall Verdict

VERIFIED (100% pass):

• All AC passed code inspection OR test execution
• All manual checks completed (user confirmed)
• Update story: Status → ✅ Verified
• Mark AC checkboxes: - [x]

UNMET (any AC failed):

• List failed/incomplete AC
• Record verification method failures (missing files, test failures)
• Return control to execution for remediation
• Update story: Status → ⚠️ AC Not Met + details

PARTIAL (manual pending):

• Some AC verified, some manual pending
• Await user responses
• Lock story until all checks complete

Verification Methods

Failure Handling

Missing Implementation File:

AC: "User model stores email address"
Method: Code Inspection
Result: FAIL - File 'src/models/User.ts' not found
Action: Return to execution for file creation

Test Failure:

AC: "Invalid password rejected"
Method: Test Execution
Result: FAIL - test 'rejects invalid password' failed
Error: Expected status 401, got 200
Action: Return to execution for code fix

Manual Confirmation Required:

AC: "Login form validation error displays in red"
Method: Manual Check
Prompt: "Verify AC: Login form validation error displays in red"
User Response: "yes" or "no"
Action: Record response, proceed or flag remediation

Output Structure

Success Output:

{
  "verified": true,
  "status": "complete",
  "summary": {
    "stories_verified": 5,
    "total_ac": 18,
    "ac_passed": 18,
    "ac_failed": 0,
    "verification_time_ms": 12500
  },
  "results": [
    {
      "story_id": "US-001",
      "ac_total": 4,
      "ac_passed": 4,
      "ac_failed": 0,
      "status": "verified"
    }
  ],
  "unmet_criteria": []
}

Failure Output:

{
  "verified": false,
  "status": "blocked",
  "summary": {
    "stories_verified": 5,
    "total_ac": 18,
    "ac_passed": 15,
    "ac_failed": 3,
    "verification_time_ms": 12500
  },
  "results": [
    {
      "story_id": "US-002",
      "ac_total": 4,
      "ac_passed": 3,
      "ac_failed": 1,
      "status": "unmet",
      "failed_ac": [
        {
          "criterion": "Password reset email sent within 30 seconds",
          "method": "test_execution",
          "error": "Test timeout: email not sent"
        }
      ]
    }
  ],
  "unmet_criteria": [
    "US-002: AC 2 - Password reset email sent within 30 seconds",
    "US-003: AC 1 - File upload supports .pdf files",
    "US-005: AC 3 - Admin dashboard shows user count"
  ]
}

Integration

Called by:

• validation-phase skill (after execution)
• /audit command (post-implementation)
• /build command (acceptance validation)

Calls:

• File system checks (Read tool)
• Test execution (pnpm test --run)
• User prompts (for manual verification)

Next step: If verified → proceed to report-phase; If unmet → return to execution-phase

Example: AC Verification Workflow

Input Story:

# US-001: User Authentication

## Acceptance Criteria

- [ ] User can login with email + password
- [ ] Invalid credentials rejected with 401 status
- [ ] User session persists after logout + login
- [ ] Login button is visible on mobile (manual check)

## Implementation Status

Test File: src/**tests**/auth.test.ts
Files Modified: src/auth.ts, src/services/AuthService.ts

Verification Process:

1. AC #1: "User can login with email + password"
   → Run src/__tests__/auth.test.ts
   → Test 'login with valid credentials' passes
   → Status: PASS

2. AC #2: "Invalid credentials rejected with 401 status"
   → Run src/__tests__/auth.test.ts
   → Test 'login rejects invalid credentials' passes
   → Status: PASS

3. AC #3: "User session persists after logout + login"
   → Check file: src/services/AuthService.ts exists ✓
   → Run src/__tests__/auth.test.ts
   → Test 'session persists' passes
   → Status: PASS

4. AC #4: "Login button is visible on mobile (manual)"
   → Prompt user: "Verify: Login button visible on mobile?"
   → User confirms: "yes"
   → Status: PASS

Result: ALL AC VERIFIED ✓
Update Story: Status → ✅ Verified, mark all AC checkboxes [x]

Success Criteria

• All AC mapped to code/tests
• Code inspection completes without errors
• Test execution passes or gracefully handles failures
• Manual checks prompted for non-automatable AC
• Clear output indicating pass/fail per AC
• Story file updated with verification status
• Unmet AC clearly documented for remediation