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: 7.9%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 60 | 1.9% |
| GitHub Copilot | GitHub | 1 | 0% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
8a92bea2ast, cgen: use AArch64 register names for `asm arm64` (#28375)Claude Codedb7eb725fasthttp, v3: fix the two `-cstrict` build errors (#28376)Claude Codec4084c76tests: check AVX-512 mask asm by codegen instead of assembling it (#28373)Claude Codea1690ef5net.vschannel: chunk large TLS payloads to fix 16KB EncryptMessage crash oGitHub Copilot
What was excluded
| Commits in window | 3,160 |
| Merge commits removed | −1 |
| CI / dependency bots removed | −37 |
| Considered | 3,122 |
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 vlang/v