Requirements Traceability Analysis

Perform bidirectional requirements traceability analysis ensuring every acceptance criterion is implemented and tested. Creates audit-ready traceability matrix showing complete chain: Requirements → Implementation → Tests.

Purpose

Create comprehensive traceability documentation that demonstrates:

• Forward traceability: AC → Implementation (with file/line evidence)
• Backward traceability: Tests → AC (with test scenario mapping)
• Gap identification: Missing implementation or test coverage
• Severity assessment: CRITICAL/HIGH/MEDIUM/LOW based on risk and impact
• Coverage metrics: Implementation coverage, test coverage, traceability score
• Quality gate impact: Prediction of gate status (PASS/CONCERNS/FAIL)

Key Capabilities:

• Evidence-based verification with file paths, line ranges, code snippets
• Integration with risk-profile (risk-informed gap severity)
• Integration with test-design (test-to-requirement mapping)
• Audit-ready documentation for compliance
• Actionable recommendations with effort estimates

When to Use This Skill

Best Used:

• During implementation review to verify all requirements addressed
• Before quality gate to ensure completeness
• During audit preparation to demonstrate traceability
• After test-design to map tests to requirements
• When coverage gaps need identification and prioritization

Integration Points:

• Reads task specification for acceptance criteria
• Reads risk profile for risk-informed gap severity (optional)
• Reads test design for test-to-requirement mapping (optional)
• Reads actual implementation files for evidence
• Reads test files for test coverage verification

Triggers:

• User asks to "trace requirements", "check coverage", "verify AC implementation"
• Before quality gate (proactively suggest)
• During code review (verify completeness)

Traceability Concepts

Forward Traceability (AC → Implementation): Maps each AC to implementation evidence (file, function, code snippet) | Status: ✅ Implemented, ⚠️ Partial, ❌ Not Implemented, ❓ Unclear

Backward Traceability (Tests → AC): Maps each test to ACs it validates | Status: ✅ Tested, ⚠️ Partial, ❌ Not Tested, 🔄 Indirect

Gap Severity: CRITICAL (9): Security/data integrity/core functionality | HIGH (6-8): Important requirements/P0 tests | MEDIUM (3-5): Minor requirements/P1 tests | LOW (1-2): Nice-to-have/P2 tests

See: references/templates.md for complete examples and classification details

SEQUENTIAL Skill Execution

CRITICAL: Do not proceed to next step until current step is complete

Step 0: Load Configuration and Context

Purpose: Load project configuration, task specification, and related assessments

Actions:

1. Load configuration from .claude/config.yaml:

   • Extract quality settings (assessmentLocation)
   • Extract risk score threshold (for gap severity assessment)

2. Get task file path from user:

   • Example: .claude/tasks/task-006-user-signup.md
   • Verify file exists and is readable

3. Read task specification:

   • Extract task ID, title, type
   • Load objective and context
   • Load Acceptance Criteria (primary traceability source)
   • Load Implementation Record section (files created/modified)
   • Load Quality Review section (if exists)

4. Load related assessments (optional but enhances analysis):

   • Risk profile: .claude/quality/assessments/{task-id}-risk-*.md (for gap severity)
   • Test design: .claude/quality/assessments/{task-id}-test-design-*.md (for test mapping)

5. Identify implementation files:

   • From task spec "Implementation Record" section
   • Files created/modified during implementation
   • Line ranges for each change

6. Prepare output:

   • Output directory: .claude/quality/assessments/
   • Output file: {task-id}-trace-{YYYYMMDD}.md
   • Template: .claude/templates/trace-requirements.md (if exists)

Output: Configuration loaded, task spec loaded with AC count, related assessments checked (risk profile/test design), implementation files identified, output path set

Halt If: Config missing, task file not found, no ACs, cannot create output

See: references/templates.md#step-0-configuration-loading-output for complete format

---

Step 1: Build Forward Traceability Matrix (AC → Implementation)

Purpose: Map each acceptance criterion to its implementation evidence

Actions:

1. For each acceptance criterion:

   • Extract AC from task specification
   • Example: "AC-1: User can sign up with email and password"

2. Search implementation files for evidence:

   • Read each file from Implementation Record
   • Search for relevant code implementing the AC
   • Record file paths, line ranges, function/class names
   • Extract code snippets as evidence (5-10 lines context)

3. Classify implementation status:

   • ✅ Implemented: Clear evidence found in code
   • ⚠️ Partial: Some evidence but incomplete (e.g., validation missing)
   • ❌ Not Implemented: No evidence found
   • ❓ Unclear: Code exists but unclear if it satisfies AC

4. Record evidence: File paths, line ranges, function names, code snippets (5-10 lines) for each AC

5. Calculate implementation coverage:

   Implementation Coverage = (Implemented + 0.5 × Partial) / Total AC × 100%
   

Output: Forward traceability complete, AC counts by status, implementation coverage %

Halt If: Cannot read implementation files, >50% ACs unclear

See: references/templates.md#step-1-forward-traceability-output for complete format and examples

---

Step 2: Build Backward Traceability Matrix (Tests → AC)

Purpose: Map each test to the acceptance criteria it validates

Actions:

1. Identify test files:

   • From test-design assessment (if available)
   • From Implementation Record (test files created)
   • From convention: **/*.test.ts, **/*.spec.ts, **/__tests__/*

2. For each test file, extract test cases:

   • Read test file
   • Extract test names from it(), test(), describe() blocks
   • Extract test scenarios (Given-When-Then if present)

   Extract test names from it(), test(), describe() blocks

3. Map tests to acceptance criteria:

   • Analyze test name and assertions
   • Determine which AC(s) the test validates
   • A single test can validate multiple ACs
   • An AC typically has multiple tests (happy path, edge cases, errors)

   Map tests to ACs (analyze test name + assertions, single test can validate multiple ACs)

4. Classify test coverage:

   • ✅ Tested: AC has at least one test validating it
   • ⚠️ Partial: AC has tests but not all scenarios covered (e.g., only happy path)
   • ❌ Not Tested: AC has no tests
   • 🔄 Indirect: AC tested indirectly through E2E or other tests

5. Calculate test coverage:

   Test Coverage = (Tested + 0.5 × Partial) / Total AC × 100%
   

Output: Backward traceability complete, tested AC counts, total tests, test coverage %

Halt If: None (proceed even if no tests, will generate gaps)

See: references/templates.md#step-2-backward-traceability-output for complete format

---

Step 3: Identify Coverage Gaps

Purpose: Identify and classify gaps in implementation and test coverage with severity ratings

Actions:

1. Identify implementation gaps:

   • ACs with status: Not Implemented, Partial, or Unclear
   • Document missing functionality
   • Estimate impact and effort

   Document missing functionality, estimate impact and effort

2. Identify test gaps:

   • ACs with test coverage: Not Tested or Partial
   • Document missing test scenarios
   • Identify missing edge cases, error cases, security tests

   Document missing test scenarios, identify edge cases/error cases

3. Classify gap severity: Use risk profile (if available) to inform severity:

   • CRITICAL (Score 9):

     • Security requirement not implemented or tested
     • Data integrity requirement missing
     • Core functionality not implemented
     • High-risk area (from risk profile) not tested

   • HIGH (Score 6-8):

     • Important requirement not implemented
     • Security test missing (but implementation exists)
     • Performance requirement not validated
     • P0 test missing

   • MEDIUM (Score 3-5):

     • Minor requirement not implemented
     • Edge case test missing
     • P1 test missing
     • Partial implementation without full test coverage

   • LOW (Score 1-2):

     • Nice-to-have requirement missing
     • P2 test missing
     • Documentation-only gap

4. Cross-reference with risk profile (if available):

   • Gaps in high-risk areas → Increase severity
   • Gaps with existing mitigation → Decrease severity
   • Gaps without test coverage for high-risk area → CRITICAL

5. Calculate gap metrics:

   Total Gaps = Implementation Gaps + Test Gaps
   Critical Gaps = Gaps with severity CRITICAL
   High Gaps = Gaps with severity HIGH
   Medium Gaps = Gaps with severity MEDIUM
   Low Gaps = Gaps with severity LOW
   
   Gap Coverage = (Total AC - Total Gaps) / Total AC × 100%
   

Output:

⚠ Coverage gaps identified
⚠ Total Gaps: {count}
⚠ Critical: {count} (Security/core functionality issues)
⚠ High: {count} (Important requirements missing)
⚠ Medium: {count} (Minor gaps, edge cases)
⚠ Low: {count} (Nice-to-have items)
⚠ Gap Coverage: {percentage}%

Halt Conditions:

• More than 50% implementation gaps (incomplete implementation, not ready for traceability)

Reference: See gap-analysis.md for gap classification and severity assessment

---

Step 4: Create Traceability Matrix

Purpose: Build comprehensive bidirectional traceability matrix combining all data

Actions:

1. Build full traceability matrix (table format):

   | AC | Requirement | Implementation | Tests | Gaps | Status |
   |----|-------------|----------------|-------|------|--------|
   | AC-1 | User can sign up with email and password | ✅ signup.ts:15-42 | ✅ 3 tests (P0) | None | ✅ Complete |
   | AC-2 | Password must be at least 8 characters | ✅ validators/auth.ts:23 | ⚠️ 1 test (missing edge cases) | GAP-2 (MEDIUM) | ⚠️ Partial |
   | AC-3 | Email must be validated | ✅ signup.ts:40, email.ts:12 | ✅ 2 tests (P1) | None | ✅ Complete |
   | AC-4 | Rate-limit login attempts | ❌ Not implemented | ❌ No tests | GAP-1 (HIGH) | ❌ Incomplete |
   

2. Generate detailed entries for each AC:

   ## AC-1: User can sign up with email and password
   
   **Implementation Status:** ✅ Implemented
   
   **Implementation Evidence:**
   - **File:** src/routes/auth/signup.ts:15-42
   - **Function:** handleSignup()
   - **Description:** Implements signup endpoint accepting email/password,
                      hashing password, creating user, sending verification email
   - **Code Snippet:** [5-10 lines showing implementation]
   
   **Test Coverage:** ✅ Tested
   
   **Test Evidence:**
   1. **Test:** "should create user with valid email and password"
      - **File:** src/routes/auth/__tests__/signup.test.ts:12-24
      - **Type:** Integration, Priority: P0
      - **Scenario:** Given valid inputs, When signup, Then user created
   
   2. **Test:** "should return 400 for invalid email format"
      - **File:** src/routes/auth/__tests__/signup.test.ts:26-35
      - **Type:** Integration, Priority: P0
      - **Scenario:** Given invalid email, When signup, Then 400 error
   
   **Coverage Status:** ✅ Complete
   - Implementation: ✅ Complete
   - Tests: ✅ Complete (3 tests covering happy path, validation, errors)
   - Gaps: None
   

3. Generate gap details: Document each gap with severity, impact, required action, effort, priority

4. Calculate overall traceability score:

   Traceability Score = (
     (Implementation Coverage × 0.5) +
     (Test Coverage × 0.4) +
     (Gap Coverage × 0.1)
   )
   
   Example:
   - Implementation Coverage: 85%
   - Test Coverage: 80%
   - Gap Coverage: 90% (10% gaps)
   
   Traceability Score = (85 × 0.5) + (80 × 0.4) + (90 × 0.1)
                      = 42.5 + 32 + 9
                      = 83.5%
   

Output: Matrix complete with entry counts, traceability score

Halt If: None

See: references/templates.md#complete-traceability-matrix-example for matrix format

---

Step 5: Generate Recommendations

Purpose: Provide actionable recommendations for closing gaps and improving traceability

Actions:

1. Prioritize gaps: Sort by:

   1. Severity (CRITICAL → HIGH → MEDIUM → LOW)
   2. Priority (P0 → P1 → P2)
   3. Effort (Small → Medium → Large)

2. Generate action plan: Prioritized actions (P0/P1/P2) with impact, effort, required actions, tests

3. Quality gate impact assessment: Determine status (PASS/CONCERNS/FAIL), provide reasoning, list actions to achieve PASS with effort estimates

4. Best practices: Future task guidance (TDD, reference AC IDs, update traceability), current task guidance (close P0 gaps, document waivers, re-run after fixes)

Output: Recommendations with P0/P1/P2 counts, effort estimates, quality gate prediction

Halt If: None

See: references/templates.md for recommendation formats and action plans

---

Step 6: Generate Traceability Report and Present Summary

Purpose: Create comprehensive traceability report and present concise summary to user

Actions:

1. Load template (if exists):

   • Read .claude/templates/trace-requirements.md
   • Use default structure if template missing

2. Populate template variables:

   • Metadata: task ID, title, date, assessor
   • Metrics: implementation coverage, test coverage, traceability score
   • Counts: total AC, total gaps, critical/high/medium/low gaps
   • Data: traceability matrix, detailed entries, gap details, recommendations

3. Generate file path:

   • Format: .claude/quality/assessments/{taskId}-trace-{YYYYMMDD}.md
   • Example: .claude/quality/assessments/task-006-trace-20251029.md
   • Create directory if needed

4. Write traceability report:

   • Complete report with all sections
   • Validate all template variables replaced
   • No placeholder text remaining

5. Present concise summary: Task metadata, coverage metrics (implementation/test/gap/traceability score), gap breakdown by severity, quality gate impact + reasoning, actions to achieve PASS with estimates, report path, next steps

Output: Report generated at output path, summary presented

Halt If: File write fails

See: references/templates.md#step-4-complete-summary-format for full summary output

---

Integration with Other Skills

Integration with risk-profile

Input: Risk scores for high-risk areas | Usage: Gaps in high-risk areas → increase severity (e.g., HIGH → CRITICAL), missing tests for high-risk → CRITICAL

Integration with test-design

Input: Test scenarios with priorities (P0/P1/P2), AC-to-test mappings | Usage: Validate test-to-AC mappings, identify missing test scenarios, use test priorities for gap severity

Integration with quality-gate

Output to quality-gate:

• Traceability score (contributes to gate decision)
• Coverage gaps (may block gate if critical)
• Action items for closing gaps
• Evidence for requirements traceability dimension

How quality-gate uses it:

Quality Gate Decision:
1. Check traceability score:
   - Score ≥95% → PASS
   - Score 80-94% → CONCERNS
   - Score <80% → FAIL

2. Check critical gaps:
   - 0 critical gaps → continue evaluation
   - 1+ critical gaps → CONCERNS (or FAIL if security)

3. Check overall coverage:
   - Implementation ≥90% AND Test ≥85% → PASS
   - Implementation ≥80% OR Test ≥70% → CONCERNS
   - Implementation <80% OR Test <70% → FAIL

Best Practices

1. Reference AC IDs in Code:

   // Implements AC-1: User signup with email and password
   export async function handleSignup(req: Request, res: Response) {
     // ...
   }
   

2. Reference AC IDs in Commits:

   git commit -m "feat: implement user signup (AC-1, AC-2, AC-3)"
   

3. Reference AC IDs in Test Names:

   it('should satisfy AC-1: user can sign up with email and password', async () => {
     // ...
   });
   

4. Run Before Code Review:

   • Check traceability before marking task as "Review"
   • Close gaps before requesting review
   • Re-run trace-requirements after closing gaps

5. Use for Audit Trail:

   • Demonstrate requirements → implementation → test chain
   • Show evidence for compliance
   • Cross-reference with risk profile for risk coverage

Configuration

In .claude/config.yaml

quality:
  # Quality assessment location
  assessmentLocation: ".claude/quality/assessments"

  # Risk score threshold for gap severity amplification
  riskScoreThreshold: 6  # Gaps in areas with risk ≥6 get higher severity

  # Traceability thresholds
  traceability:
    implementationCoverage: 90    # Minimum implementation coverage
    testCoverage: 85               # Minimum test coverage
    traceabilityScore: 80          # Minimum overall traceability score

Template File

.claude/templates/trace-requirements.md - Template for traceability report output (optional)

---

Version: 2.0 (Refactored for skill-creator compliance and Minimal V2 architecture) Category: Quality Depends On: risk-profile (optional, enhances gap severity), test-design (optional, enhances test mapping) Used By: quality-gate (uses traceability score and gaps for gate decision)