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: 34%. Bars are scaled to that peak, not to 100%.
Which agents
| GitHub Copilot | GitHub | 17 | 5.2% |
| Claude Code | Anthropic | 5 | 1.5% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
00090d24Update deploy/byteplus_alb.shGitHub Copilot73a682e5Update deploy/byteplus_alb.shGitHub Copilota1b94db9Update deploy/byteplus_alb.shGitHub Copilot943cc0cfunifios: extract JSON-split helper, document RSA/ECC name collision (#7200Claude Code41bdd4cdAdd UniFi OS Server deploy hook (#7184)Claude Code1f778e6edeploy/ssh: return non-zero when a server deployment fails (#6795)Claude Code
What was excluded
| Commits in window | 377 |
| Merge commits removed | −50 |
| CI / dependency bots removed | −0 |
| Considered | 327 |
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 acmesh-official/acme.sh