Ratchet Loop
Claude Code and Codex loop that runs the tests, then has a second model try to break the result. Open source.
Related builds
Thimble
Open source Claude Code plugin that explains what an agent did, with visualizations in the terminal.
LeanREA
An 8 KB skill for reverse engineering with plain CLI tools and no MCP server. Free and open source.
claude-openrouter
Installer that puts GLM-5.3 next to Claude models inside Claude Code, via OpenRouter.
LedgerPDF
Free, offline, open-source workpaper binder for accountants. Agents connect over local MCP, every change is journaled, and humans still sign off.