Build Health Auditor (L3 Worker)

Build Health Auditor (L3 Worker)

Specialized worker auditing build health and code quality tooling.

Purpose & Scope

• Worker in ln-620 coordinator pipeline - invoked by ln-620-codebase-auditor
• Audit codebase for build health issues (Category 2: Critical Priority)
• Check compiler/​linter errors, deprecation warnings, type errors, failed tests, build config
• Return structured findings to coordinator with severity, location, effort, recommendations
• Calculate compliance score (X/​10) for Build Health category

Inputs (from Coordinator)

Receives contextStore as JSON string:

{
  "tech_stack": {
    "language": "TypeScript",
    "build_tool": "Webpack",
    "test_framework": "Jest",
    ...
  },
  "best_practices": {...},
  "principles": {...},
  "codebase_root": "/​path/​to/​project"
}

Workflow

1. Parse Context: Extract tech stack, build tools, test framework from contextStore
2. Run Build Checks: Execute compiler, linter, type checker, tests (see Audit Rules below)
3. Collect Findings: Record each violation with severity, location, effort, recommendation
4. Calculate Score: Count violations by severity, calculate compliance score (X/​10)
5. Return Results: Return JSON with category, score, findings to coordinator

Audit Rules (Priority: CRITICAL)

1. Compiler/​Linter Errors

What: Syntax errors, compilation failures, linter rule violations

Detection by Stack:

Linters:

• ESLint (JS/​TS): npx eslint . --format json → parse JSON for errors
• Pylint (Python): pylint **/​*.py --output-format=json
• RuboCop (Ruby): rubocop --format json
• golangci-lint (Go): golangci-lint run --out-format json

Severity:

• CRITICAL: Compilation fails, cannot build project
• HIGH: Linter errors (not warnings)
• MEDIUM: Linter warnings
• LOW: Stylistic linter warnings (formatting)

Recommendation: Fix errors before proceeding, configure linter rules, add pre-commit hooks

Effort: S-M (fix syntax error vs refactor code structure)

2. Deprecation Warnings

What: Usage of deprecated APIs, libraries, or language features

Detection:

• Compiler warnings: DeprecationWarning, @deprecated in stack trace
• Dependency warnings: npm outdated, pip list --outdated
• Static analysis: Grep for @deprecated annotations

Severity:

• CRITICAL: Deprecated API removed in next major version (imminent breakage)
• HIGH: Deprecated with migration path available
• MEDIUM: Deprecated but still supported for 1+ year
• LOW: Soft deprecation (no removal timeline)

Recommendation: Migrate to recommended API, update dependencies, refactor code

Effort: M-L (depends on API complexity and usage frequency)

3. Type Errors

What: Type mismatches, missing type annotations, type checker failures

Detection by Stack:

Severity:

• CRITICAL: Type error prevents compilation (tsc fails, cargo check fails)
• HIGH: Runtime type error likely (implicit any, missing type guards)
• MEDIUM: Missing type annotations (code works but untyped)
• LOW: Overly permissive types (any, unknown without narrowing)

Recommendation: Add type annotations, enable strict mode, use type guards

Effort: S-M (add types to single file vs refactor entire module)

4. Failed or Skipped Tests

What: Test suite failures, skipped tests, missing test coverage

Detection by Stack:

Severity:

• CRITICAL: Test failures in CI/​production code
• HIGH: Skipped tests for critical features (payment, auth)
• MEDIUM: Skipped tests for non-critical features
• LOW: Skipped tests with "TODO" comment (acknowledged debt)

Recommendation: Fix failing tests, remove skip markers, add missing tests

Effort: S-M (update test assertion vs redesign test strategy)

5. Build Configuration Issues

What: Misconfigured build tools, missing scripts, incorrect paths

Detection:

• Missing build scripts in package.json, Makefile, build.gradle
• Incorrect paths in tsconfig.json, webpack.config.js, Cargo.toml
• Missing environment-specific configs (dev, staging, prod)
• Unused or conflicting build dependencies

Severity:

• CRITICAL: Build fails due to misconfiguration
• HIGH: Build succeeds but outputs incorrect artifacts (wrong target, missing assets)
• MEDIUM: Suboptimal config (no minification, missing source maps)
• LOW: Unused config options

Recommendation: Fix config paths, add missing build scripts, optimize build settings

Effort: S-M (update config file vs redesign build pipeline)

Scoring Algorithm

violations = {critical: N, high: M, medium: K, low: L}

penalty = (critical * 2.0) + (high * 1.0) + (medium * 0.5) + (low * 0.2)

score = max(0, 10 - penalty)

Examples:

• 0 violations → 10/​10
• 1 critical (build fails) → 8/​10
• 2 critical, 5 high → 3/​10
• 10 high, 20 medium → 0/​10

Output Format

Return JSON to coordinator:

{
  "category": "Build Health",
  "score": 7,
  "total_issues": 5,
  "critical": 1,
  "high": 2,
  "medium": 2,
  "low": 0,
  "findings": [
    {
      "severity": "CRITICAL",
      "location": "src/​utils/​helper.ts:45",
      "issue": "TypeScript error: Type 'string' is not assignable to type 'number'",
      "principle": "Type Safety",
      "recommendation": "Fix type mismatch: change 'id: string' to 'id: number' or update usage",
      "effort": "S"
    },
    {
      "severity": "HIGH",
      "location": "tests/​api.test.ts:112",
      "issue": "Test failed: Expected 200, received 404",
      "principle": "Test Quality",
      "recommendation": "Update API endpoint or fix test assertion",
      "effort": "M"
    }
  ]
}

Critical Rules

• Do not auto-fix: Report violations only; coordinator creates task for user to fix
• Tech stack aware: Use contextStore to run appropriate build commands (npm vs cargo vs gradle)
• Exit code checking: Always check exit code (0 = success, non-zero = failure)
• Timeout handling: Set timeout for build/​test commands (default 5 minutes)
• Environment aware: Run in CI mode if detected (no interactive prompts)

Definition of Done

• contextStore parsed successfully
• All 5 build checks completed (compiler, linter, type checker, tests, config)
• Findings collected with severity, location, effort, recommendation
• Score calculated using penalty algorithm
• JSON result returned to coordinator

Reference Files

• Build audit rules: references/​build_rules.md

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Version: 3.0.0 Last Updated: 2025-12-23