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: 25%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 56 | 8.2% |
| Cursor Agent | Anysphere | 1 | 0.1% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
9e623fe5[PERF](agent): Cache the Anthropic request prefix (#7744)Claude Code83abab0a[CLN](agent): Split anthropic.rs into a module (#7745)Claude Code5d8645d7[BUG](worker): Revert the async fn window widening from #7621 (#7684)Claude Codeccf5968d[CHORE](js-client): Bump chromadb to 3.5.0 (#7367)Cursor Agent
What was excluded
| Commits in window | 681 |
| Merge commits removed | −0 |
| CI / dependency bots removed | −0 |
| Considered | 681 |
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 chroma-core/chroma