Pre-Commit Checks

VerifiedSafe

Runs Ruff linting and formatting with auto-fix, then performs Mypy type checking on Python files. Use this skill before every git commit to catch errors early and meet CI requirements. It stages auto-fixed files if needed and reports pass/fail results.

Sby Skills Guide Bot
DevelopmentBeginner
6/2/2026
Claude CodeCursorWindsurfCopilotCodex
#pre-commit#code-quality#linting#type-checking#python

Recommended for

Automated summary

Runs all pre-commit checks (lint and typecheck) before every git commit to ensure code quality.

Strengths

  • Automates linting and formatting with Ruff
  • Checks types with Mypy to catch common errors
  • Auto-fixes files and stages them for commit

Limitations

  • Only supports Python projects
  • Mypy options are very permissive (ignores many error codes)
  • Does not include other checks like tests or security
When to use it

Before every commit on a Python project to ensure code meets quality standards.

When not to use it

For non-Python projects or when you need stricter type checking (since Mypy is configured leniently).

Security analysis

Safe
Quality score90/100

Commands run local linting (ruff) and type checking (mypy) on project files. No network access, file deletion, or secret exfiltration. The `--fix` flag modifies source files locally, which is expected. No obfuscation or disabling of safety mechanisms.

No concerns found

How this analysis is made

Examples

Run pre-commit checks
Run pre-commit checks on my Python project (lint with Ruff and typecheck with Mypy) before I commit.
Fix and check code
Run all pre-commit checks and auto-fix any lint issues, then stage the changes.
Full pre-commit run
Execute the pre-commit skill: lint with Ruff (auto-fix and format), then typecheck with Mypy, and report pass/fail.

name: precommit description: Run all pre-commit checks (lint + typecheck). Use before every git commit to ensure code quality.

Pre-Commit Checks

Run all required checks before committing.

Commands

# 1. Ruff lint check (auto-fix and format)
git ls-files "*.py" | xargs python -m ruff check --fix
git ls-files "*.py" | xargs python -m ruff format

# 2. Mypy type check
python -m mypy src/ --ignore-missing-imports --disable-error-code=union-attr --disable-error-code=no-redef --disable-error-code=no-any-return --disable-error-code=attr-defined --disable-error-code=assignment --disable-error-code=arg-type --disable-error-code=index --disable-error-code=misc

Instructions

  1. Run lint check with auto-fix
  2. Run format
  3. Run mypy type check
  4. Report results:
    • PASS if both succeed
    • FAIL with details if either fails
  5. Stage any auto-fixed files if requested

Checklist

  • [ ] Ruff lint passes
  • [ ] Ruff format applied
  • [ ] Mypy type check passes

Notes

  • NEVER commit without passing ALL checks
  • CI will reject PRs with lint/type errors
  • Run this skill before every commit

From the file to a first result

The download contains exactly the content displayed on this page. This copy may differ from the latest version in the source repository.

View the source and supporting files

This download contains SKILL.md only. Any scripts, references, templates and dependencies are not included. Get the required files from the source, preserving their directory structure, before continuing.

1. Download the file

Download SKILL.md

From the root of a test project, save the file as .skill-downloads/pre-commit-checks-mma3jsdj/SKILL.md, or use the command below. This folder is for inspecting the skill before installation.

Command for macOS/Linux or WSL: requires a POSIX shell and curl. On Windows without WSL, use the download button and create the folder manually.

mkdir -p '.skill-downloads/pre-commit-checks-mma3jsdj' && curl --fail --show-error --location 'https://skills-guides.com/api/skills/pre-commit-checks-mma3jsdj/download' --output '.skill-downloads/pre-commit-checks-mma3jsdj/SKILL.md.part' && mv '.skill-downloads/pre-commit-checks-mma3jsdj/SKILL.md.part' '.skill-downloads/pre-commit-checks-mma3jsdj/SKILL.md'

2. Check prerequisites

Read SKILL.md before using it. If it references scripts or external services, inspect them and prepare the required access in your test environment.

No recognized prerequisites section in this file. This does not mean it is self-contained: libraries, tools and access requirements may be mentioned elsewhere in the content or source repository.

The platforms on this page are catalog indications. The paths below follow tool documentation; they do not prove this skill has been run in those tools. No minimum tool version is confirmed for this listing.

3. Load the skill

After inspection, copy the complete folder into your project using one of the commands below, then open a new tool session. The command stops if a folder with the same name already exists: compare the files before replacing it.

Claude Code
test -f '.skill-downloads/pre-commit-checks-mma3jsdj/SKILL.md' && test -s '.skill-downloads/pre-commit-checks-mma3jsdj/SKILL.md' && mkdir -p '.claude/skills' && test ! -e '.claude/skills/precommit' && cp -R '.skill-downloads/pre-commit-checks-mma3jsdj' '.claude/skills/precommit'

Cursor
test -f '.skill-downloads/pre-commit-checks-mma3jsdj/SKILL.md' && test -s '.skill-downloads/pre-commit-checks-mma3jsdj/SKILL.md' && mkdir -p '.cursor/skills' && test ! -e '.cursor/skills/precommit' && cp -R '.skill-downloads/pre-commit-checks-mma3jsdj' '.cursor/skills/precommit'

Codex
test -f '.skill-downloads/pre-commit-checks-mma3jsdj/SKILL.md' && test -s '.skill-downloads/pre-commit-checks-mma3jsdj/SKILL.md' && mkdir -p '.agents/skills' && test ! -e '.agents/skills/precommit' && cp -R '.skill-downloads/pre-commit-checks-mma3jsdj' '.agents/skills/precommit'

OpenSkills

OpenSkills must already be installed. The local install/read procedure is checked with OpenSkills 1.5.0, which requires Node.js ≥ 20.6.0. Catalog slugs are not resolved automatically.

Official OpenSkills installation
openskills install './.skill-downloads/pre-commit-checks-mma3jsdj'

openskills read 'pre-commit-checks-mma3jsdj'

Reading should display the installed file content and its base directory. It does not run the skill or install its dependencies.

For an agent that reads AGENTS.md, then sync the index. This command changes AGENTS.md: review the diff before using it.

openskills sync

Manual method or another tool: attach SKILL.md to a conversation, or open it in an agent that can read files. Include any required supporting resources. No universal folder is recognized by every tool.

4. Try a first task

Use a short, synthetic input: an API endpoint, a small document or an interface brief. In a new conversation, attach the file or give the agent its path, then adapt this request:

Read .skill-downloads/pre-commit-checks-mma3jsdj/SKILL.md and apply its instructions to this example: [describe a test input]. Identify any missing files, dependencies or access. Produce the result requested by the skill without inventing data or running unreviewed scripts.

Expected result: output matching the skill instructions, or a precise list of missing prerequisites. A read confirmation alone does not validate a first use. If an external resource is unavailable, that path remains untested.

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