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Justfile Style Guidelines

justfile-style

Style guidelines for justfile recipe documentation. Use when writing or editing justfiles to ensure consistent and concise documentation.

SKILL.md

Full skill instructions

Justfile Style Guidelines

This skill provides best practices for writing justfile recipe documentation comments.

Doc Comment Simplification

For very short justfile recipes, change the doc comment string to be the entire command instead of a descriptive phrase.

When to Simplify

  • The cutoff for when to perform this refactoring should be approximately a single line of 120 characters
  • If the recipe is a shebang recipe, don't shorten the doc comment
  • If the recipe is multiple lines, or longer than 120 characters, don't shorten the doc comment

Example Transformation

❌ Before:

# Install dependencies
[group('setup')]
install:
    npm install

✅ After:

# npm install
[group('setup')]
install:
    npm install

Rationale

For simple, single-command recipes, the command itself is often more informative than a descriptive phrase. This approach:

  1. Reduces redundancy: "Install dependencies" vs "npm install" convey the same information
  2. Shows the actual command: Users can see exactly what will run
  3. Maintains consistency: All simple recipes follow the same pattern
  4. Improves scannability: The actual command is immediately visible

When NOT to Simplify

Keep descriptive doc comments for:

  1. Multi-line recipes:
# Set up development environment
[group('setup')]
dev-setup:
    npm install
    cp .env.example .env
    just db-migrate
  1. Shebang recipes:
# Generate API documentation
[group('docs')]
gen-docs:
    #!/​usr/​bin/​env bash
    set -euo pipefail
    # ... multiple lines of bash script
  1. Long single-line commands (>120 characters):
# Build production bundle with optimizations
[group('build')]
build-prod:
    webpack --mode production --config webpack.prod.js --optimization-minimize --output-path dist/

In these cases, a descriptive comment provides more value than repeating the complex command.

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