Command Development

Shows Claude Code how to build slash commands from markdown files, covering the YAML frontmatter options, dynamic arguments with $1/$2 syntax, and file references with @ notation. The key insight here is that commands are instructions FOR Claude, not messages to users, which trips people up initially. You'll want this when you're setting up project workflows, creating reusable prompts with parameters, or need commands that execute bash inline to grab git status or environment context. It explains the difference between project commands in .claude/commands/ versus personal ones in ~/.claude/commands/, plus how to control tool access and model selection per command.

skills.sh installs: 186
GitHub stars: 476
last updated: Aug 21, 2026

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Install

$ npx -y skills add aiskillstore/marketplace --skill command-development --agent claude-code

Installs into .claude/skills of the current project.

Files

Command Development for Claude Code

Overview

Slash commands are frequently-used prompts defined as Markdown files that Claude executes during interactive sessions. Understanding command structure, frontmatter options, and dynamic features enables creating powerful, reusable workflows.

Key concepts:

Markdown file format for commands
YAML frontmatter for configuration
Dynamic arguments and file references
Bash execution for context
Command organization and namespacing

Command Basics

What is a Slash Command?

A slash command is a Markdown file containing a prompt that Claude executes when invoked. Commands provide:

Reusability: Define once, use repeatedly
Consistency: Standardize common workflows
Sharing: Distribute across team or projects
Efficiency: Quick access to complex prompts

Critical: Commands are Instructions FOR Claude

Commands are written for agent consumption, not human consumption.

When a user invokes /command-name, the command content becomes Claude's instructions. Write commands as directives TO Claude about what to do, not as messages TO the user.

SKILL.md on GitHub