4.4%

of 1,136 commits were committed by an AI agent — a floor, not an estimate

4.4% agent · top contributor 54%12 contributors

team

A small group is using agents. Adoption has spread beyond one person but is not project-wide.

agent commits

1,086

human commits

agent contributors

54%

largest contributor

Assisted or autonomous

50assisted

0autonomous

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

Feb26

Mar26

Apr26

May26

Jun26

Jul26

Aug26

Peak month: 13.1%. Bars are scaled to that peak, not to 100%.

Which agents

Claude Code	Anthropic	44	3.9%
GitHub Copilot	GitHub	4	0.4%
OpenAI Codex	OpenAI	2	0.2%

Verify it yourself

Sample commits that matched. Every one links to GitHub — check the trailers.

dc59333etest(format/html): format embedded content in the formatter tests (#11209)Claude Code
6a855885fix(parse/html): stop reading `{{` as an interpolation in Svelte (#11195)Claude Code
0a0fbc15feat(lint/js): add `useReactCompiler` (#10710)Claude Code
2093e3eefeat: implement useSortedEnumMembers (#10000)GitHub Copilot
2056b238feat(html): port useKeyWithClickEvents a11y rule to HTML (#9495)GitHub Copilot
aa82576ffeat(html): port useValidAriaValues a11y rule to HTML (#9928)GitHub Copilot
d150071bfeat(formatter/yaml): initial implementation for block sequences (#10529)OpenAI Codex
4da9caf8fix(parser/css): handle nested rules in embedded snippets (#9995)OpenAI Codex

What was excluded

Commits in window	1,379
Merge commits removed	−36
CI / dependency bots removed	−207
Considered	1,136

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 biomejs/biome

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