Groma.md: Stay in control of your architecture as AI agents write code

groma.md is a free, MIT-licensed tool that scans a repository into a live C4 architecture map stored as Open Knowledge Format Markdown in Git, updating as files are saved and keeping curation across later scans. It runs locally with no account or backend, uses deterministic code analysis, calls no AI service, and can be used entirely without AI; coding agents can curate the map via the same CLI. Architecture changes are reviewed in the same pull request as the code, and an optional GitHub Action comments on PRs with change counts and a before-and-after map.