Just Command Runner

Overview

Expert guidance for Just, a command runner with syntax inspired by make. Use this skill for creating justfiles, writing recipes, configuring settings, and implementing task automation workflows.

Key capabilities:

Create and organize justfiles with proper structure
Write recipes with attributes, dependencies, and parameters
Configure settings for shell, modules, and imports
Use built-in constants for terminal formatting
Implement check/write patterns for code quality tools

Quick Reference

Essential Settings

set allow-duplicate-recipes       # Allow recipes to override imported ones
set allow-duplicate-variables     # Allow variables to override imported ones
set shell := ["bash", "-euo", "pipefail", "-c"]  # Strict bash with error handling
set unstable                      # Enable unstable features (modules, script attribute)
set dotenv-load                   # Auto-load .env file
set positional-arguments          # Pass recipe args as $1, $2, etc.

Attribute	Purpose
`[arg("p", long, ...)]`	Configure parameter as `--flag` option (v1.46)
`[group("name")]`	Group recipes in `just --list` output
`[no-cd]`	Don't change to justfile directory
`[private]`	Hide from `just --list` (same as `_` prefix)
`[script]`	Execute recipe as single script block
`[script("interpreter")]`	Use specific interpreter (bash, python, etc.)
`[confirm("prompt")]`	Require user confirmation before running
`[doc("text")]`	Override recipe documentation
`[positional-arguments]`	Enable positional args for this recipe only

# Long option (--target)
[arg("target", long)]
build target:
    cargo build --target {{ target }}

# Short option (-v)
[arg("verbose", short="v")]
run verbose="false":
    echo "Verbose: {{ verbose }}"

# Combined long + short
[arg("output", long, short="o")]
compile output:
    gcc main.c -o {{ output }}

# Flag without value (presence sets to "true")
[arg("release", long, value="true")]
build release="false":
    cargo build {{ if release == "true" { "--release" } else { "" } }}

# Help string (shown in `just --usage`)
[arg("target", long, help="Build target architecture")]
build target:
    cargo build --target {{ target }}

just build --target x86_64
just build --target=x86_64
just compile -o main
just build --release
just --usage build    # Show recipe argument help

[no-cd, private]
[group("checks")]

Just Cli | Skills Pool

Just Cli

Just Cli

Just Command Runner

Overview

Quick Reference

Essential Settings

Common Attributes

Recipe Argument Flags (v1.46.0+)

Prose

Coding Agent (bash-first)

Create Prompt

Strategic Compact

Strategic Compact

Strategic Compact