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: 2.1%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 13 | 1% |
| GitHub Copilot | GitHub | 5 | 0.4% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
d4f266defix(build): deduplicate CSS assets between prerender and SSR environments Claude Codeffceaa24Fix Cloudflare adapter silently swallowing prerender errors (#17049)Claude Coded4b0cd11fix(cloudflare): inject headers for caching the assets folder (#16571)Claude Code72e29bd7fix(client router): prevent head elements loss during page transitions witGitHub Copilot428cb1bbForward user optimizeDeps settings to SSR environments in Cloudflare adaptGitHub Copilotee079d4cchore: merge main into next (#16434)GitHub Copilot
What was excluded
| Commits in window | 1,414 |
| Merge commits removed | −31 |
| CI / dependency bots removed | −67 |
| Considered | 1,316 |
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 withastro/astro