Open sourceShell · ≈5.6k stars · MIT
Agent OS
Codebase standards and spec shaping for spec-driven agent development.
Agent OS is a lightweight system from Brian Casel's Builder Methods for keeping coding agents aligned with how a team already builds. It extracts patterns and conventions from an existing codebase into documented standards, indexes them, injects the relevant standards based on what is being built, and helps shape better specs before implementation. It works alongside Claude Code, Cursor, Antigravity and other AI tools, independent of language or framework.
Neighbours on the workbench
MDX · ≈307k stars · MIT
obra/superpowers
An agentic skills framework and software methodology that works.
Maintained by Jesse Vincent (obra)
Shell · ≈306k stars · MIT
mattpocock/skills
Small, composable agent skills for real engineering work.
Maintained by Matt Pocock (AI Hero)
JavaScript · ≈292k stars · MIT
affaan-m/ECC
Agent harness performance optimization system: skills, instincts, memory and security for coding agents.
Maintained by Affaan Mustafa
Connections
Relations from the Harness Hub knowledge graph, as charted in the State of Harness reports.
Maintained by · 1
- Builder MethodsOrganisation
Built on · 1
- Claude CodeProject
Similar entries · 2
- GSD Core (Get Shit Done)Project
- OpenSpecProject
Sources
Verified Oct 29, 2026