setup-pre-commit

A setup guide for installing Git pre-commit hooks, which run checks before a commit is created. It selects a hook tool for JavaScript, Python, Go, Rust, or OCaml projects and configures formatting, type checks, and tests where available.

In plain words
What is it for?
Use it when adding commit-time checks to a project, detecting its ecosystem, installing the matching hook tool, and configuring available formatter, type-check, and test commands.
Why use it?
It catches formatting problems, type errors, and failing tests before changes enter the repository's history. It also avoids choosing a hook tool that does not fit the project's language.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/outlinedriven/odin-codex-plugin/setup-pre-commit
Any agent
npx skills add OutlineDriven/odin-codex-plugin --skill setup-pre-commit
Clone the repo
git clone --depth 1 https://github.com/OutlineDriven/odin-codex-plugin

Made for: Claude Code, Codex.

Per session 73 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 997 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00073 $0.00997
Opus 5 $0.00036 $0.00498
Sonnet 5 $0.00015 $0.00199
Haiku 4.5 $0.00007 $0.00100

Measured 2d ago against content hash afc1f6d1e3ec, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

setup-pre-commit scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

skills/setup-pre-commit/SKILL.md · 114 lines

How it starts

The opening of the file, as written. The whole thing — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.

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:

{ "*": "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:

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]

Read the full file on GitHub · 114 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 114 lines · 73 tokens per session scan A afc1f6d1e3ec

Subscribe to this mod's changes

setup-pre-commit is a skill published in the GitHub repository OutlineDriven/odin-codex-plugin (15 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 73 tokens to every session and 997 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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