One person is driving this. The headline number reflects a single contributor's workflow, not a project-wide shift.
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: 5%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 16 | 0.8% |
| GitHub Copilot | GitHub | 3 | 0.1% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
e197468aDisable "Rename clip" unless a single clip is selected, add "Rename label"Claude Code1a76f273trackspanel: realign realtime-effects column and address review feedbackClaude Codec6c1205etheme: stop misusing backgroundSecondaryColor on full-page surfacesClaude Codea5a85c5bfix: breakpoints aren't clippedGitHub Copilotdb1edbb0fix: search doesn't ignore other filtersGitHub Copilotf3f346acfix stack overflow with value-change guardGitHub Copilot
What was excluded
| Commits in window | 2,573 |
| Merge commits removed | −467 |
| CI / dependency bots removed | −24 |
| Considered | 2,082 |
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 audacity/audacity