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: 3.8%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 5 | 0.9% |
| OpenAI Codex | OpenAI | 2 | 0.4% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
79a769ac[mypyc] Fix reference leak when setting unboxed refcounted attrs (#21657)Claude Coded23f5f00Fix false positive "Expected TypedDict key to be string literal" for UnionClaude Code5e0c2749[mypyc] Fix cross-group call to inherited __mypyc_defaults_setup (#21481)Claude Code60fa82e5Fix strict optional with generic defaults (#21788)OpenAI Codexf59f649bFix changelog for mypy 2.1 (#21565)OpenAI Codex
What was excluded
| Commits in window | 566 |
| Merge commits removed | −0 |
| CI / dependency bots removed | −8 |
| Considered | 558 |
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 python/mypy