Git

Git is a distributed version control system. It tracks every change to every file in a project. Every change is a “commit” with a timestamp, author, and message. You can see what changed, when, and why. You can revert to any previous state. You can branch off, experiment, and merge back.

Created by Linus Torvalds in 2005 for the Linux kernel. Now the standard for virtually all software projects. GitHub, GitLab, and Bitbucket are platforms built on top of git.

Why AI agents use it. Git is the persistence and traceability layer for markdown-engineered systems. Your CLAUDE.md, rules, skills, and memory files all live in git. Every refinement is a commit. Every rule change is a diff. When an agent misbehaves on Tuesday, you run git blame and find the instruction change from Monday that caused it. That traceability is what makes this engineering, not guesswork.

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