This repository provides a curated registry of reusable skills for AI agents, addressing the fragmentation and quality control issues in agent development workflows. It targets developers using various AI agents like Mercury, Claude Code, Codex CLI, and others, offering a standardized format for production-ready tools that enhance developer productivity and agent capabilities.

How It Works

The core innovation lies in the SKILL.md format, a simple Markdown file with YAML frontmatter defining metadata and a Markdown body containing instructions. This universal format ensures compatibility across multiple agent runtimes without requiring per-agent forks. Skills are meticulously hand-curated against real-world developer workflows, distinguishing them from AI-generated or unverified content and ensuring higher quality and reliability.

Quick Start & Requirements

• Primary Install: Use the Mercury CLI: mercury skills search "query" and mercury skills install <category>/<slug>.
• Web Install: Browse skills.mercuryagent.sh, select a skill, and copy the agent-specific install command.
• Prerequisites: Mercury Agent (npm install -g @cosmicstack/mercury-agent) is recommended for CLI usage. Git is needed to clone the repository.
• Supported Agents: Mercury, Claude Code, Codex CLI, OpenClaw, Hermes, Cursor, Gemini CLI, and any agent supporting the SKILL.md standard.
• Links: skills.mercuryagent.sh, CONTRIBUTING.md

Highlighted Details

• A library of over 130 skills across 23 categories, including Development, AI & ML, DevOps, and Backend.
• Universal SKILL.md format ensures compatibility across major AI agent platforms.
• skills.mercuryagent.sh provides a searchable, categorized web interface with per-skill details and install commands.
• Skills are hand-written, production-ready, and designed for real developer workflows, avoiding AI-generated "slop."
• Automated synchronization ensures the web platform reflects repository changes rapidly.

Maintenance & Community

Maintained by Cosmic Stack, the project actively encourages contributions via pull requests, following standards outlined in CONTRIBUTING.md. Merged contributions are automatically synced to the skills.mercuryagent.sh platform. Specific community channels like Discord or Slack are not detailed in the README.

Licensing & Compatibility

The project is licensed under the MIT license. This permissive license allows for broad compatibility, including commercial use and integration within closed-source projects.

Limitations & Caveats

The README does not explicitly state limitations. The primary requirement for using skills is an agent runtime that supports the SKILL.md format. The quality and applicability of skills are dependent on the curation process and community contributions.