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: 30%. Bars are scaled to that peak, not to 100%.
Which agents
| GitHub Copilot | GitHub | 195 | 6.9% |
| Claude Code | Anthropic | 17 | 0.6% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
9e44ec0e[liblzma] Update to 5.8.4 (#53867)GitHub Copilot7a5a88d6[dpp] Updated to 10.1.6 (#53719)GitHub Copilot5f2bf1ae[highs] add extras feature (#53346)GitHub Copilot9eef1090[kuku] Update to 4.0.0 (#53855)Claude Code2e24b0ee[dlib] fix public compiler flags leaking to consumers (#53375)Claude Codea29317a3[libtorch] Update to 2.13 (#52815)Claude Code
What was excluded
| Commits in window | 2,818 |
| Merge commits removed | −2 |
| CI / dependency bots removed | −5 |
| Considered | 2,811 |
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 microsoft/vcpkg