Open-source skill collections are turning coding agents into disciplined engineers rather than just code generators. KDnuggets highlights five GitHub projects, from Jesse Vincent's Superpowers methodology and Matt Pocock's composable engineering skills to Addy Osmani's Agent Skills, that add planning, TDD, debugging and review workflows to Claude Code, Codex and Cursor. https://www.kdnuggets.com/5-best-github-repositories-for-ai-agent-skills #AIagent #AI #GenAI #AgenticAI