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CI #1881 failed at head8bee1b65: the durable-snapshot gate was 40/41, the sole failure being the Part 7 NEGATIVE control ("secret leaked through the symlink"). Root cause is a test-harness portability gap, not a code defect: node:24-alpine runs busybox cp as root, and busybox cp REPLACES a symlinked destination instead of following it, whereas GNU/BSD cp — what a real operator runs `mosaic update` under — follows the link and leaks. So under the CI harness the CWE-59 leak vector the control asserts simply cannot occur, and the negative control can't reproduce. Fix is test-only; install.sh (independently approved at8bee1b65) and the real security assertions are untouched. make_symlink_leaf_shim now emulates GNU cp's follow-through-dest-symlink behavior portably: when the destination is a symlink it writes the source bytes through the link via redirection (which follows symlinks on every coreutils, busybox included); otherwise it delegates to the host cp unchanged. Both the shipped-case and the control run through this single shim, so the ONLY difference between them remains the SYMLINK-LEAF-GUARD — the control stays load-bearing and non-tautological, now on busybox too. With the guard present the symlinked leaf is dropped before this cp runs, so the shipped path is unchanged. Verified in the exact CI image (node:24-alpine, busybox, root, apk add bash rsync): durable-snapshot 41/41, manifest-guard 193, rollback 28. GNU host 41/41, shellcheck clean. Sole tracked delta vs8bee1b65= this test file. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Quality Rails
Portable quality enforcement for TypeScript, Python, and Node.js projects.
🎯 What This Prevents
Based on real-world validation of 50 issues in a production codebase:
- ❌ Hardcoded passwords
- ❌ SQL injection vulnerabilities
- ❌ Type safety violations (
anytypes) - ❌ Missing test coverage
- ❌ Build failures
- ❌ Dependency vulnerabilities
70% of these issues are prevented mechanically with quality-rails.
⚡ Quick Start (Mosaic)
New Project
# Apply template from Mosaic
~/.config/mosaic/bin/mosaic-quality-apply --template typescript-node --target /path/to/project
# Install dependencies
cd /path/to/project
npm install
# Initialize git hooks
npx husky install
# Verify enforcement is working
~/.config/mosaic/bin/mosaic-quality-verify --target /path/to/project
Existing Project
# Same as above - works for new or existing projects
~/.config/mosaic/bin/mosaic-quality-apply --template typescript-node --target /path/to/existing-project
🛡️ What You Get
✅ TypeScript strict mode - All type checks enabled
✅ ESLint blocking any types - no-explicit-any: error
✅ Pre-commit hooks - Type check + lint + format before commit
✅ Secret scanning (gitleaks) - Block hardcoded passwords/API keys (pre-commit + CI)
✅ CI/CD templates - Woodpecker, GitHub Actions, GitLab
✅ Test coverage enforcement - 80% threshold
✅ Security scanning - npm audit, OWASP checks
📦 Available Templates
| Template | Language | Framework | Status |
|---|---|---|---|
typescript-node |
TypeScript | Node.js | ✅ Ready |
typescript-nextjs |
TypeScript | Next.js | ✅ Ready |
monorepo |
TypeScript | TurboRepo + pnpm | ✅ Ready |
python |
Python | - | 🚧 Coming Soon |
Monorepo Template
Perfect for projects combining Next.js frontend + NestJS backend in one repository.
Features:
- 🎯 Multi-package aware - lint-staged only checks changed packages
- ⚡ TurboRepo caching - Faster builds and tests
- 🔀 Parallel dev servers - Run web + API simultaneously
- 📦 pnpm workspaces - Efficient dependency management
- 🛡️ Package-specific rules - Next.js and NestJS get appropriate ESLint configs
Example structure:
monorepo/
├── apps/
│ ├── web/ # Next.js frontend
│ └── api/ # NestJS backend
└── packages/
├── shared-types/
├── ui/
└── config/
🧪 How It Works
Pre-Commit (Local Enforcement)
# You try to commit code with a type error
git commit -m "Add feature"
# Quality rails blocks it:
❌ Type error: Type 'number' is not assignable to type 'string'
❌ ESLint: Unexpected any. Specify a different type.
✋ Commit blocked - fix errors and try again
CI/CD (Remote Enforcement)
# Woodpecker pipeline runs:
✓ gitleaks (secret scanning — parallel, no deps)
✓ npm audit (dependency security)
✓ eslint (code quality)
✓ tsc --noEmit (type checking)
✓ jest --coverage (tests + coverage)
✓ npm run build (compilation — gates on all above)
# If any step fails, merge is blocked
🎓 Philosophy
Process compliance doesn't work.
Instructing AI agents to "do code review" or "run tests" fails. They claim to follow processes but output quality doesn't match claims.
Mechanical enforcement works.
Quality rails don't ask agents to follow processes. They block commits that don't pass automated checks.
- Type errors? → Commit blocked
- Hardcoded secrets? → Commit blocked
- Test failures? → Commit blocked
- Missing coverage? → Commit blocked
This works for any agent runtime (Codex, Claude, OpenCode, Gemini, etc.) because enforcement is mechanical, not instructional.
📖 Documentation
🔧 Scripts
| Script | Purpose |
|---|---|
scripts/install.sh |
Install template to project (Linux/Mac) |
scripts/install.ps1 |
Install template to project (Windows) |
scripts/verify.sh |
Verify enforcement is working (Linux/Mac) |
scripts/verify.ps1 |
Verify enforcement is working (Windows) |
🚀 Roadmap
- TypeScript/Node template
- Pre-commit enforcement (husky + lint-staged)
- CI/CD templates (Woodpecker, GitHub Actions)
- Installation scripts
- Verification testing
- Next.js template
- Monorepo template
- Python template
- Coverage visualization
- IDE integration (VSCode extension)
🤝 Contributing
Quality Rails is based on lessons learned from real production codebases. Contributions welcome!
📝 License
MIT License - See LICENSE file for details
🙏 Credits
Built to solve real problems discovered in AI-assisted development workflows.
Based on validation findings from a production patch milestone.