I built a new tool. It is a Level 2 project harness installer (blurs into Level 3). The page is at tacoda.dev/keystone. The repo is at github.com/tacoda/keystone.
What it does
keystone init drops a markdown harness into your repo. Five layers: principles, idioms, domain, state, process. Plus an activation file the agent reads first: CLAUDE.md for Claude Code, AGENTS.md for Codex CLI, .cursor/rules/000-harness.mdc for Cursor.
After init the binary is done. The harness is yours. It is plain markdown checked into your repo, edited by you, owned by your team. Keystone is not a runtime dependency: it is a scaffolder that hands you the artifacts and walks away.
Install is one binary. Either:
