Paths: File paths (shared/, references/, ../ln-*) are relative to skills repo root. If not found at CWD, locate this SKILL.md directory and go up one level for repo root.

E2E Critical Coverage Auditor (L3 Worker)

Specialized worker auditing E2E test coverage for critical paths (risk-based).

Purpose & Scope

• Worker in ln-630 coordinator pipeline
• Audit E2E Critical Coverage (Category 2: High Priority)
• Validate E2E coverage for critical paths (Money/Security/Data Priority ≥20)
• Validate E2E coverage for core user journeys (Priority 15-19)
• Identify wasteful E2E tests (Usefulness Score <15)
• Calculate compliance score (X/10)

Inputs (from Coordinator)

MANDATORY READ: Load shared/references/task_delegation_pattern.md#audit-coordinator--worker-contract for contextStore structure.

Receives contextStore with: tech_stack, testFilesMetadata, codebase_root, output_dir.

Workflow

1. Parse Context: Extract tech stack, critical paths, user journeys, test file list, output_dir from contextStore
2. Identify Critical Paths: Scan codebase for critical paths (Money, Security, Data)
3. Identify Core Journeys: Identify core user journeys (multi-step flows)
4. Check Critical Path Coverage: Check E2E coverage for critical paths (Priority >=20)
5. Check Journey Coverage: Check E2E coverage for user journeys (Priority 15-19)
6. Validate E2E Tests: Validate existing E2E tests (Usefulness Score >=15)
7. Collect Findings: Record each violation with severity, location (file:line), effort estimate (S/M/L), recommendation
8. Calculate Score: Count violations by severity, calculate compliance score (X/10)
9. Write Report: Build full markdown report in memory per shared/templates/audit_worker_report_template.md, write to {output_dir}/632-e2e-priority.md in single Write call
10. Return Summary: Return minimal summary to coordinator (see Output Format)

Audit Rules

1. Critical Path E2E Coverage

Rule: Every critical path MUST have E2E test

Critical Paths (Priority ≥20):

• Money (Priority 25): Payment processing, refunds, discounts, tax calculation
• Security (Priority 25): Login, auth, password reset, token refresh, permissions
• Data Export (Priority 20): Reports, CSV generation, data migration

Detection:

1. Scan codebase for critical keywords: payment, refund, login, auth, export
2. Extract critical functions/endpoints
3. Check if E2E test exists for each critical path
4. Missing E2E for Priority ≥20 → CRITICAL severity

Severity:

• CRITICAL: No E2E for Priority 25 (Money, Security)
• HIGH: No E2E for Priority 20 (Data Export)

Recommendation: Add E2E tests for critical paths immediately

Effort: M

2. Core User Journey E2E Coverage

Rule: Multi-step critical flows MUST have E2E test

Core Journeys (Priority 15-19):

• Registration → Email verification → First login (Priority 16)
• Product search → Add to cart → Checkout (Priority 18)
• File upload → Processing → Download result (Priority 15)

Detection:

1. Identify multi-step flows in routes/controllers
2. Check if end-to-end journey test exists
3. Missing E2E for Priority ≥15 → HIGH severity

Severity:

• HIGH: Missing E2E for core user journey (Priority ≥15)
• MEDIUM: Incomplete journey coverage (only partial steps tested)

Recommendation: Add end-to-end journey tests

Effort: M-L

3. E2E Test Usefulness Validation

Rule: Every E2E test MUST justify Priority ≥15

Check: For each E2E test, calculate Usefulness Score = Impact × Probability

• If Score <15 → Flag as "Potentially wasteful E2E"
• Recommendation: Convert to Integration or Unit test (cheaper)

Example:

• E2E test for "API returns 200 OK" → Impact 2, Probability 1 → Score 2 → WASTEFUL
• E2E test for "Payment with discount calculates correctly" → Impact 5, Probability 5 → Score 25 → VALUABLE

Severity:

• MEDIUM: E2E test with Usefulness Score <15
• LOW: E2E test with Score 10-14 (review needed)

Recommendation: Convert low-value E2E to Integration/Unit or remove

Effort: S

Scoring Algorithm

MANDATORY READ: Load shared/references/audit_scoring.md for unified scoring formula.

Severity mapping:

• Missing E2E for Priority 25 (Money, Security) → CRITICAL
• Missing E2E for Priority 20 (Data Export) → HIGH
• Missing E2E for Priority 15-19 (Core Journeys) → HIGH
• Wasteful E2E (Score <15) → MEDIUM
• Incomplete journey coverage → LOW

Output Format

MANDATORY READ: Load shared/templates/audit_worker_report_template.md for file format.

Write report to {output_dir}/632-e2e-priority.md with category: "E2E Critical Coverage" and checks: critical_path_coverage, user_journey_coverage, e2e_usefulness_validation.

Return summary to coordinator:

Report written: docs/project/.audit/ln-630/{YYYY-MM-DD}/632-e2e-priority.md
Score: X.X/10 | Issues: N (C:N H:N M:N L:N)

Critical Rules

• Do not auto-fix: Report only
• Risk-based only: Prioritize by business impact (Money > Security > Data), not by code coverage percentage
• Effort realism: S = <1h, M = 1-4h, L = >4h
• Usefulness Score threshold: Only flag E2E tests with Score <15 as wasteful
• No pyramid enforcement: Do not recommend E2E/Integration/Unit ratios — focus on critical path coverage

Definition of Done

• contextStore parsed successfully (including output_dir)
• Critical paths identified (Money, Security, Data) with Priority scores
• All 3 checks completed (critical path coverage, user journey coverage, E2E usefulness validation)
• Findings collected with severity, location, effort, recommendation
• Score calculated using penalty algorithm
• Report written to {output_dir}/632-e2e-priority.md (atomic single Write call)
• Summary returned to coordinator

Reference Files

• Worker report template: shared/templates/audit_worker_report_template.md
• Audit scoring formula: shared/references/audit_scoring.md
• Audit output schema: shared/references/audit_output_schema.md

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Version: 3.0.0 Last Updated: 2025-12-23