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: 8.2%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 33 | 3.2% |
| GitHub Copilot | GitHub | 21 | 2% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
bc9c8501Lo zotero initial library sync (#34456)Claude Codee5f712a8[web] Cleanup `plans-2026-phase-1` - phase 2: pug/backend pricing (#34623)Claude Code93a4f0c8Remove unused celebrate dependency from project-history (#34604)Claude Code6613ef2f[WEB] Move Review Toggle into the toolbar - 2 (#34578)GitHub Copilot32664a1d[web] Update Share modal paywall CTAs to point to the plans interstitial (GitHub Copilotda85973cadd script for uploading a file to a project (#33874)GitHub Copilot
What was excluded
| Commits in window | 1,049 |
| Merge commits removed | −0 |
| CI / dependency bots removed | −5 |
| Considered | 1,044 |
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 overleaf/overleaf