A small group is using agents. Adoption has spread beyond one person but is not project-wide.
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: 52.2%. Bars are scaled to that peak, not to 100%.
Which agents
| GitHub Copilot | GitHub | 30 | 9.7% |
| Claude Code | Anthropic | 2 | 0.6% |
| OpenAI Codex | OpenAI | 1 | 0.3% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
c2655911[LAPOINTE] Add 54 sites (#3149)GitHub Copilot17ae36a4Update sponsorship section in README (#3153)GitHub Copilotfbb82555Update HackTheBox and Wikipedia to use new API endpoints (#2470)GitHub Copilota8e7ab45Bump lxml minimum to 6.0.2 for Python 3.14 compatibility (#2279)Claude Code5aa7f642Overhaul site tags and naming: add social tag to 33 networks, fill mi… (#2Claude Code5888f812Fix HackerNews and Rajce.net false positives (#2780)OpenAI Codex
What was excluded
| Commits in window | 499 |
| Merge commits removed | −0 |
| CI / dependency bots removed | −190 |
| Considered | 309 |
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 soxoj/maigret