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: 92.1%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 256 | 28.2% |
| Cursor Agent | Anysphere | 14 | 1.5% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
78218a88chore: normalize line endings to LF via .gitattributes (#1032)Claude Code8475c855LinkedIn source: honor the date window, follow the cursor, and signal partClaude Codefec2d824fix: accept an API root in *_BASE_URL overrides (#918)Claude Codeac0ed3b7docs(credit): attribute #953 fix to Terry Li (@terry-li-hm) via #1041/#113Cursor Agent6db8e94afix(github): qualifier-only or empty topics are clean no-results, not ERROCursor Agent1dbdbcfcfix(planner): honor operator --plan subquery sources at default/deep (#109Cursor Agent
What was excluded
| Commits in window | 1,191 |
| Merge commits removed | −231 |
| CI / dependency bots removed | −51 |
| Considered | 909 |
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 mvanhorn/last30days-skill