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: 72.7%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 253 | 52.3% |
| Cursor Agent | Anysphere | 49 | 10.1% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
a4e4b3abUpdate scroll test for WAAPI-accelerated backgroundColorClaude Code33a1820fDrop the production fallback for non-DOM refsClaude Codeebe35f22Throw an actionable invariant for non-DOM custom component refsClaude Code99731dc3Rename usedLength to measureDimension and reword AnimationElement docCursor Agent27e222c5Shorten keyframes fast path commentCursor Agent7c3129adCollapse ElementState into a thin effect adapterCursor Agent
What was excluded
| Commits in window | 686 |
| Merge commits removed | −170 |
| CI / dependency bots removed | −32 |
| Considered | 484 |
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 motiondivision/motion