setup-pre-commit

A setup guide for checks that run automatically before a Git commit in JavaScript or TypeScript projects. It uses tools such as Husky and lint-staged to format or lint only files being committed.

In plain words
What is it for?
Use it to configure Husky hooks, lint-staged, formatters, package-manager-aware commands, and the division between local checks and heavier CI checks.
Why use it?
It catches simple problems before code enters the repository while keeping commit-time checks quick and practical.

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/andrewsrigom/agent-skills/setup-pre-commit
Any agent
npx skills add andrewsrigom/agent-skills --skill setup-pre-commit
Clone the repo
git clone --depth 1 https://github.com/andrewsrigom/agent-skills

Made for: Claude Code, Codex.

Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 531 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 $0.00046 $0.00531
Opus 5 $0.00023 $0.00266
Sonnet 5 $0.00009 $0.00106
Haiku 4.5 $0.00005 $0.00053

Measured 2d ago against content hash ed5932fed5d3, 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.

engineering/setup-pre-commit/SKILL.md · 70 lines

How it starts

The opening of the file, as written. The whole thing — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Setup Pre-Commit

Use this skill when the user wants commit-time checks without overloading the hook.

Scope

  • Husky setup
  • lint-staged configuration
  • Prettier or existing formatter integration
  • package-manager-aware hook commands
  • choosing what belongs in pre-commit versus CI

Default path

  1. Detect the package manager and current scripts.
  2. Install the minimum hook dependencies.
  3. Initialize Husky if the repo does not already use it.
  4. Configure lint-staged for staged-file formatting or linting.
  5. Keep the pre-commit hook fast:
    • staged formatting or linting first
    • lightweight checks second
    • heavy suites in CI unless the repo explicitly wants them locally
  6. Verify the hook against the current scripts instead of inventing missing commands.

When to deviate

  • Keep the hook even smaller when the repo already struggles with slow local tooling.
  • Add more checks only if the repo already runs them reliably and the team explicitly wants them before commit.
  • Skip formatter or lint changes if the repo already has a working hook stack that only needs a small fix.

Guardrails

  • Do not add typecheck or test to the hook if the repo does not already support them cleanly.
  • Prefer staged-file checks over whole-repo checks in pre-commit.
  • Keep the hook deterministic and package-manager-aware.
  • Do not introduce a formatter config if the repo already has one.

Avoid

  • turning pre-commit into a slow mini-CI pipeline
  • inventing scripts the repo does not actually have
  • running whole-repo checks when staged-file checks are enough
  • overwriting an existing formatter setup without reason

Verification checklist

  • the package manager and current scripts were detected first
  • hook commands are fast enough for normal commit flow
  • checks operate on staged files where possible
  • CI-only work stays out of pre-commit unless explicitly desired
  • the hook matches the repo's real tooling, not imagined tooling

Output Shape

When answering with this skill, prefer:

Read the full file on GitHub · 70 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 · 70 lines · 46 tokens per session scan A ed5932fed5d3

Subscribe to this mod's changes

setup-pre-commit is a skill published in the GitHub repository andrewsrigom/agent-skills (2 stars, last pushed 5mo ago), licensed MIT. It adds 46 tokens to every session and 531 once invoked, about $0.0002 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 2026-08-31.

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