Cleo

Cleo is an open-source package manager for Claude Code, described in its README as "the missing package manager for Claude," aimed at developers who extend Claude with rules, skills, agents, commands, hooks, and MCP servers. It works like npm, pip, or cargo but for the Claude ecosystem: you declare dependencies in a manifest and Cleo fetches and installs them. Concrete features include lock-file pinning by commit SHA for reproducible installs across machines, three scope buckets (project-wide, local/gitignored, and user-global), transitive dependency resolution so packages can declare their own dependencies, and parallel fetching via a --jobs flag for faster large installs. There is no central registry; packages resolve to GitHub URLs by default, and Cleo can migrate previously installed skills without reorganizing them. Core commands include cleo require, cleo install, cleo update, cleo remove, and cleo list. Written in Python 3.9+ (with git and PyYAML), it installs via pip (pip install ClaudeCleo), as a Claude Code plugin, or from source. Cleo is free and open source under the GPL-3.0-or-later license.

Developers use Cleo to install and version-pin Claude Code rules, skills, agents, and MCP servers from a single manifest.