Adoption is broad. Many contributors are committing agent-authored work, which is what a real organisational rollout looks like.
Assisted or autonomous
Assisted — a developer’s identity authored the commit and the agent added itself as co-author. The agent ran git commit during a working session, with a person there. Autonomous — a bot identity is the author, no human in the loop. Across the whole index, 93.7% of agent commits are assisted.
Agent share by month
Peak month: 0.2%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 28 | 0.1% |
| GitHub Copilot | GitHub | 8 | 0% |
| OpenAI Codex | OpenAI | 4 | 0% |
| Cursor Agent | Anysphere | 2 | 0% |
| Devin | Cognition | 1 | 0% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
46fa384btight-studio 3.0.5 (new cask)Claude Codeefc24302Add linguaxClaude Code3cb023f2jetbrains-toolbox: add uninstall quitClaude Codee4beeecfdocker-desktop: quit Electron appGitHub Copilot82da097dgithub-copilot-app: update zap stanzaGitHub Copilot7653d1deApply suggestion from code reviewGitHub Copilot39189466Add zap stanza for screenkiteOpenAI Codex1480c97aKeep screenkite cask Sonoma minimumOpenAI Codexeaef4d01Restrict screenkite cask to arm64 TahoeOpenAI Codexa90083eaUpdate pocket-bard desc and zap stanzasCursor Agent10e36d61Add pocket-bard caskCursor Agent5f4b0d94windsurf: rename to devin-desktopDevin
What was excluded
| Commits in window | 87,700 |
| Merge commits removed | −38,888 |
| CI / dependency bots removed | −44 |
| Considered | 48,768 |
Bots are excluded from the denominator entirely. Counting dependabot as “AI-written code” is the fastest way to produce a meaningless number.
How this was measured
Measured over February–August 2026, cloned directly. Detection is deterministic string matching against signatures agents write about themselves — no heuristics, no style analysis. Merge commits and CI bots are excluded from the denominator. The figure is a floor: squash merges strip trailers, so real usage is higher. Contributor counts are aggregate — no individual is named.
Run it yourself: npx qmmit-cli Homebrew/homebrew-cask