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: 19.6%. Bars are scaled to that peak, not to 100%.
Which agents
| GitHub Copilot | GitHub | 27 | 2.6% |
| Claude Code | Anthropic | 11 | 1.1% |
| OpenAI Codex | OpenAI | 1 | 0.1% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
4da6320dfix: rebase sourcemaps when copying files (#17082)GitHub Copilot4bbd0c48feat: split edge functions (#17045)GitHub Copilot244f80aechore: refactor edge function entrypoint (#17060)GitHub Copilot48eb9d79chore: remove dead code and unused dependencies (#16840)Claude Code696a8017fix: avoid `Promise.withResolvers` in client remote functions (#16777)Claude Codeb557b1bafix: align MAX_COOKIE_SIZE with RFC 6265bis (#16322)Claude Code24d7e76achore: fix reuse wording in client comment (#15679)OpenAI Codex
What was excluded
| Commits in window | 1,269 |
| Merge commits removed | −109 |
| CI / dependency bots removed | −120 |
| Considered | 1,040 |
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 sveltejs/kit