# Casey Just Just

> Just

- Skill: `tomevault-io/casey-just-just` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/casey-just-just`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/casey-just-just/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/casey-just-just

---


Just
====

Discovery
---------

- `just --dump` Print justfile
- `just --evaluate` Print variable values
- `just --help` Print detailed command-line syntax help
- `just --list` Print recipes with descriptions
- `just --show <RECIPE>` Print recipe source
- `just --summary` Print recipes without descriptiosn

Execution
---------

- `just` Run default recipe
- `just <RECIPE>` Run specific recipe
- `just <RECIPE> <ARG1> <ARG2` Run recipe with arguments

Syntax
------

```just
executable := 'main'

# compile main.c
compile:
  cc main.c -o {{ executable }}

# run main
run: compile
  ./{{ executable }}

# run test
test name: compile
  ./bin/test {{ name }}

# start webserver
serve port='8080':
  python -m http.server {{port}}

# publish current tag
publish:
  #!/usr/bin/env bash
  set -euxo pipefail
  tag=`git describe --tags --exact-match`
  ./bin/check-tag $tag
  git push origin $tag
```

Notes
-----

The comment proceeding a recipe is used as its doc-comment, and included in
`just --list`.

By default, each line of a recipe runs in a fresh shell. Recipes whose bodies
start with `#!` are written to a file and executed as a script.

Commonly used commands and scripts should be turned into `just` recipes.

---
> Source: [casey/just](https://github.com/casey/just) — distributed by [TomeVault](https://tomevault.io).
<!-- tomevault:4.0:skill_md:2026-06-18 -->