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mmintelandClaude Sonnet 5.5 6e5d14882e chore: add agent guardrails (CLAUDE.md, stop hook, permissions, git hooks)

CLAUDE.md documents commands, the spec-first workflow, the functional-core
rule and a do-not list. A Claude Code Stop hook blocks finishing while
typecheck or unit tests fail. Permissions deny reading env files, hook
bypass flags, hard resets and recursive deletes, and ask before CI edits
or any push. Husky pre-commit now also typechecks and runs unit tests;
pre-push runs coverage and the mutation gate when src/domain changed.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

2026-10-03 18:14:04 +02:00

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mintel.me

Personal website of a senior freelance engineer. Next.js 16 (App Router) + Payload, pnpm monorepo. App lives in apps/web. Concept and scope: apps/web/plans/freelance-relaunch.md (read it first).

Commands (run from repo root)

pnpm --filter @mintel/web typecheck — must pass with zero errors
pnpm --filter @mintel/web test — unit specs (Vitest); 0 tests run counts as a failure
pnpm --filter @mintel/web test:coverage — src/domain must stay at 100%
pnpm --filter @mintel/web test:mutation — Stryker on src/domain, ~2 min, must score 100
pnpm --filter @mintel/web lint

How to work here (spec first)

Write the behavior as concrete cases (inputs, outputs, edge cases, errors) as a *.spec.ts.
Run it and confirm it fails for the right reason (missing behavior, not an import error).
Implement the simplest clean solution, run again.
Run typecheck, coverage and mutation. Survivors mean weak specs or dead code: fix one or the other.
Report the exact commands and results. "Done" means they were run on the current code. Never weaken, skip or delete a test to make it pass.

Architecture rules

Functional core, imperative shell. Pure logic goes in apps/web/src/domain/ (no I/O, no clock, no randomness, no framework imports; pass today etc. in as arguments). Everything there is covered 100% and mutation-tested. Pages, routes and adapters stay thin and call into the core.
Parse at the boundary into precise types (Result, discriminated unions); no nullable state bags.
No any, @ts-ignore, ! non-null assertions or eslint-disable to silence errors. Fix the cause.

Do not

Read or edit .env* (only .env.example). Never print or log secrets.
Commit scratch files (tmp*, *.log, *.tmp, debug HTML, build output). They are gitignored; keep it so.
Use --no-verify, force-push, push to main, or run reset --hard, clean, rm -rf without asking.
Edit .gitea/workflows/* or deploy config without asking.
Upgrade vitest past 4.1.x: @stryker-mutator/vitest-runner 10.0.0 runs zero tests per mutant under vitest 5 and reports false survivors. Re-verify mutation results after any tooling bump.
Add dependencies for trivial things, or touch unrelated code (no drive-by refactors).

Gotchas

Stryker needs plugins listed explicitly in stryker.config.json (pnpm layout) and ignores the large asset folders via ignorePatterns; keep them in sync when adding top-level folders.
@mintel/* packages are link: dependencies on a sibling at-mintel checkout.
Git branches: work on feat/*, never directly on main.

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