format-on-edit

/plugin install format-on-edit --marketplace rezk2ll/skills

What it does

Formats and lints every file Claude writes or edits, with the tools the project already has. Lint errors left after autofix go back to Claude, so it can fix them in the same turn.

When to use it

• You want Claude's edits to match your formatter without asking for it.
• You want lint errors caught at edit time, not in CI.

How it works

• Runs after Write and Edit, only on files inside a git repo.
• Looks for prettier and eslint in the nearest node_modules/.bin, walking up from the file, so each sub-project of a monorepo uses its own version.
• Prettier formats JS, TS, Svelte, Vue, JSON, CSS, Markdown and YAML. ESLint runs with --fix on JS, TS, Svelte and Vue.
• Python uses ruff format and ruff check --fix, Go uses gofmt, Rust uses rustfmt, PHP uses vendor/bin/php-cs-fixer, when they are installed.
• Errors left after the fix make the hook exit 2 with the list, so Claude sees them.

Requirements

• jq and git. The formatters and linters are optional: a missing tool is skipped.

{
  "hooks": {
    "PostToolUse": [
      {
        "hooks": [
          {
            "type": "command",
            "command": "\"${CLAUDE_PLUGIN_ROOT}\"/scripts/format-edited.sh",
            "timeout": 60,
            "statusMessage": "Formatting and linting..."
          }
        ],
        "matcher": "Write|Edit"
      }
    ]
  }
}