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: 13.3%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 7 | 2.5% |
| GitHub Copilot | GitHub | 4 | 1.4% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
f1c40b06Accept boolean sub-schemas in 2025-11-25 tool schema properties (#3354)Claude Code5285e936Pin text I/O to UTF-8 and fail CI on locale-dependent reads/writes (#3296)Claude Code2378e560Read UTF-8 test fixtures with explicit encoding (#3245)Claude Code2693fb95chore(deps): bump the github-actions group across 1 directory with 9 updatGitHub Copiloteaf971cfAdd warning log when rejecting request with unknown/expired session ID (#2GitHub Copilot7c022482fix(oauth): include client_id in token request body for client_secret_postGitHub Copilot
What was excluded
| Commits in window | 288 |
| Merge commits removed | −0 |
| CI / dependency bots removed | −9 |
| Considered | 279 |
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 modelcontextprotocol/python-sdk