obra/superpowers is trending as the single most-starred repo on GitHub today at 85,182 stars, described as 'an agentic skills framework & software development methodology that works.' The Shell-based framework defines skills as reusable agent behavior packages installable via Claude Code and other coding agents, and is the foundational methodology behind the growing skills ecosystem. This is the gravitational center of the agent skills category that has spawned 5+ downstream ecosystems totaling 100K+ combined stars.