setup-pre-commit
Install git pre-commit hooks via the project's hook tool — Husky+lint-staged (JS), pre-commit (Python/OCaml), lefthook (Go), cargo-husky (Rust). Use when the user wants commit-time formatting, linting, type-checking, or test gates. Detects ecosystem first.
What this skill does
Detect the ecosystem, pick the right hook tool, install with formatter + type-check + test gates.
## Detection (run first)
Dispatch Explore agent — or for a single-language repo, probe directly via `fd` for lockfile / manifest signature. Map the first manifest hit to an ecosystem. Multi-language repos: ask the maintainer which surface to gate, or apply both.
## Ecosystem → hook tool
| Ecosystem | Hook tool | Install command |
| -------------------- | -------------------------- | ---------------------------------------------------------------- |
| npm / yarn / pnpm / bun | husky + lint-staged | `<pm> add -D husky lint-staged prettier && npx husky init` |
| Python (poetry/pip) | pre-commit (framework) | `pipx install pre-commit && pre-commit install` |
| Go | lefthook (or pre-commit) | `go install github.com/evilmartians/lefthook@latest && lefthook install` |
| Rust (cargo) | cargo-husky (or pre-commit)| add `cargo-husky` as `[dev-dependencies]`; runs on `cargo test` |
| OCaml (dune) | pre-commit + dune hooks | `pipx install pre-commit && pre-commit install` |
## Per-ecosystem hook contents
**Node ecosystems** — write `.husky/pre-commit`:
```
npx lint-staged
<pm> run typecheck
<pm> run test
```
Drop missing scripts and tell the user. Write `.lintstagedrc`:
```json
{ "*": "prettier --ignore-unknown --write" }
```
Formatter policy is **out of scope** for this skill. Do NOT auto-create `.prettierrc`. If no Prettier config exists, surface that fact and ask the user.
**Python** — write `.pre-commit-config.yaml`:
```yaml
repos:
- repo: https://github.com/astral-sh/ruff-pre-commit
rev: v0.6.0
hooks:
- id: ruff
- id: ruff-format
- repo: local
hooks:
- id: pyright
name: pyright
entry: pyright
language: system
pass_filenames: false
- id: pytest
name: pytest
entry: pytest -q
language: system
pass_filenames: false
stages: [pre-commit]
```
**Go** — write `lefthook.yml`:
```yaml
pre-commit:
parallel: true
commands:
fmt: { run: gofmt -l -w {staged_files} }
vet: { run: go vet ./... }
test: { run: go test -race ./... }
```
**Rust** — `Cargo.toml`:
```toml
[dev-dependencies]
cargo-husky = { version = "1", default-features = false, features = ["precommit-hook", "run-cargo-test", "run-cargo-clippy", "run-cargo-fmt"] }
```
**OCaml** — `.pre-commit-config.yaml`:
```yaml
repos:
- repo: local
hooks:
- id: dune-fmt
name: dune fmt
entry: dune fmt
language: system
pass_filenames: false
- id: dune-build
name: dune build
entry: dune build
language: system
pass_filenames: false
- id: dune-test
name: dune runtest
entry: dune runtest
language: system
pass_filenames: false
```
## Verify
- `fd -d 2 -t f '\.husky|\.pre-commit-config\.yaml|lefthook\.yml'` shows the expected file.
- The hook is executable.
- Run a no-op commit (`git commit --allow-empty -m "chore: verify hooks"`) — every gate must run and pass.
## Commit
`chore: install pre-commit hooks (<tool>)`. The commit itself trips the new hook — first-class smoke test.
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