agentskills.codes vs Mirrors

agentskills.codes indexes public SKILL.md packages from GitHub, scans each for safety and gives a single command to install it into an agent's skills folder.

Mirrors rebuilds the systems your AI agents call and replays real sessions against every prompt, tool, or model change before it reaches production.

About agentskills.codes

agentskills.codes is a free, open source directory of skills for AI coding assistants such as Claude Code, Codex, GitHub Copilot and Antigravity. A skill is a folder containing a SKILL.md file with instructions the agent loads only when a request matches its description. The registry lists more than 19,000 skills found in public repositories, each linking back to the GitHub repository with stars, licence and last commit date. Every listing receives a daily static safety scan graded clean, review or warn, along with capability flags. Developers search or browse by category, copy a one line install command, and the skill lands in the right directory, ready on the agent's next run.

About Mirrors

Mirrors rebuilds the systems your AI agents call and replays real sessions against every prompt, tool, or model change before it reaches production. Schema, seed data, and tool behavior mined into a runnable copy of the systems your agent calls, including the internal tools nobody will give you a test instance of. Every change is tested against past sessions before it merges. The Replay screen diffs each recorded production call against its counterpart in the environment, so you can see where the two agree and where they drift before you trust it with a merge gate.