Verification Loop Skill A comprehensive verification system for Claude Code sessions. When to Use Invoke this skill: After completing a feature or significant code change Before creating a PR When you want to ensure quality gates pass After refactoring Verification Phases Phase 1: Build Verification

Check if project builds

npm run build 2

&1 | tail -20

OR

pnpm build 2

&1 | tail -20 If build fails, STOP and fix before continuing. Phase 2: Type Check

TypeScript projects

npx tsc --noEmit 2

&1 | head -30

Python projects

pyright . 2

&1 | head -30 Report all type errors. Fix critical ones before continuing. Phase 3: Lint Check

JavaScript/TypeScript

npm run lint 2

&1 | head -30

Python

ruff check . 2

&1 | head -30 Phase 4: Test Suite

Run tests with coverage

npm run test -- --coverage 2

&1 | tail -50

Check coverage threshold

Target: 80% minimum

Report: Total tests: X Passed: X Failed: X Coverage: X% Phase 5: Security Scan

Check for secrets

grep -rn "sk-" --include = ".ts" --include = ".js" . 2

/dev/null | head -10 grep -rn "api_key" --include = ".ts" --include = ".js" . 2

/dev/null | head -10

Check for console.log

grep -rn "console.log" --include = ".ts" --include = ".tsx" src/ 2

/dev/null | head -10 Phase 6: Diff Review

Show what changed

git diff --stat git diff HEAD~1 --name-only Review each changed file for: Unintended changes Missing error handling Potential edge cases Output Format After running all phases, produce a verification report: VERIFICATION REPORT ================== Build: [PASS/FAIL] Types: [PASS/FAIL] (X errors) Lint: [PASS/FAIL] (X warnings) Tests: [PASS/FAIL] (X/Y passed, Z% coverage) Security: [PASS/FAIL] (X issues) Diff: [X files changed] Overall: [READY/NOT READY] for PR Issues to Fix: 1. ... 2. ... Continuous Mode For long sessions, run verification every 15 minutes or after major changes: Set a mental checkpoint: - After completing each function - After finishing a component - Before moving to next task Run: /verify Integration with Hooks This skill complements PostToolUse hooks but provides deeper verification. Hooks catch issues immediately; this skill provides comprehensive review.