mattpocock/skills v1.2
Matt Pocock's agent skills repo hits v1.2 with full docs and 63% cheaper skill descriptions. 13.5M downloads and one of the most-starred repos on GitHub.
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ECC – Ultimate Claude Skills Pack
Massive open-source collection of 279 skills and 67 agents that works across Claude Code, Cursor, Codex and more. Won Anthropic hackathon.
Thimble
Open source Claude Code plugin that explains what an agent did, with visualizations in the terminal.
Agent Readiness
Claude skill that scores how ready a repo is for a coding agent. Open source.
LeanREA
An 8 KB skill for reverse engineering with plain CLI tools and no MCP server. Free and open source.