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Code Linting (Ruff + Biome)

Runs and safely fixes lint/format issues with Ruff for Python and Biome for JavaScript/TypeScript.

Dev & CodingIntermediate★ 419⑂ 44AI score 9/10Last updated: Sep 5, 2026

What it does

  • Runs lint and format checks: ruff check / ruff format for Python, @biomejs/biome check for JS/TS.
  • Honors existing project config first — pyproject.toml, biome.json, or make lint / make lint-fix — before falling back to defaults.
  • After auto-fixing, reviews git diff, reverts incorrect fixes, and reruns the checks.
  • Gives concrete remediation notes for common rules: F401, I001, E501, plus Biome's noVar, useConst, noDoubleEquals.
  • Includes recovery paths when tooling is missing (virtualenv, pipx, package deps) and forbids silently installing tools during a read-only check.

Who it's for

  • Python or JS/TS developers who keep hitting lint failures in CI.
  • Teams that don't want an agent loosening rules or expanding refactor scope to force a pass.
  • Maintainers of mixed repos with a Python backend and a TS frontend.

Example uses

  1. "Fix the lint errors" → runs ruff check ., fixes only F401/I001 inside the requested scope, reports the diff.
  2. "CI format check is failing" → runs ruff format --check . and Biome check to separate lint failures from format failures.
  3. "run biome" on a TS repo → npx @biomejs/biome check src/ with rule/file:line diagnostics.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/notque/vexjoy-agent/HEAD/skills/code-quality/code-linting/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the skills/code-quality/code-linting folder from the GitHub repo notque/vexjoy-agent into my ~/.claude/skills/code-linting/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/notque/vexjoy-agent.git && mkdir -p ~/.claude/skills && cp -r vexjoy-agent/skills/code-quality/code-linting ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal.
  2. Clone the repo: git clone https://github.com/notque/vexjoy-agent.git
  3. Create the skills folder: mkdir -p ~/.claude/skills
  4. Copy the skill: cp -r vexjoy-agent/skills/code-quality/code-linting ~/.claude/skills/
  5. Verify the bundled references/ docs came along: ls ~/.claude/skills/code-linting
  6. Restart Claude Code, then ask "lint code" or "run ruff" inside a project to trigger it.
  7. Make sure ruff (in your Python venv) and/or Node + npx are available so the commands can actually run.
View source on GitHub ↗License: MIT