A small group is using agents. Adoption has spread beyond one person but is not project-wide.
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: 5.6%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 3 | 2.6% |
| Cursor Agent | Anysphere | 1 | 0.9% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
1e4eb4bffix(rust) reuse the string rules inside attributes (#4461)Claude Codeedff655bfix(xml): remove recursive sublanguage references to prevent ReDoS (#4361)Claude Coded9b538d0fix(c, cpp): keep raw string delimiters from swallowing quotes (#4456)Claude Code84d5b8b1fix(crystal): stop treating integer division // as a regex literal (#4431)Cursor Agent
What was excluded
| Commits in window | 133 |
| Merge commits removed | −0 |
| CI / dependency bots removed | −19 |
| Considered | 114 |
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 highlightjs/highlight.js