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biomejs/biome ↗
4.2%
of 1,373 commits were committed by an AI agent — a floor, not an estimate
4.2% agent · top contributor 46.6%14 contributors
org-wide

Adoption is broad. Many contributors are committing agent-authored work, which is what a real organisational rollout looks like.

58
agent commits
1,315
human commits
14
agent contributors
46.6%
largest contributor

Assisted or autonomous

58assisted
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
Sep26

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

Which agents

Claude CodeAnthropic513.7%
GitHub CopilotGitHub50.4%
OpenAI CodexOpenAI40.3%

Verify it yourself

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

  • 71eaa0d6feat(lint/html/svelte): add noSvelteAtDebugTags (#11754)Claude Code
  • 21a10cfcfix(type-inference): infer callback parameter types from call signatures (Claude Code
  • d0b67c88feat(js_plugin): support TypeScript plugins (#11418)Claude Code
  • 5eb5f09bfeat(biome_js_analyze): implement useValidTestTitle rule (#9176) (#11725)GitHub Copilot
  • 2093e3eefeat: implement useSortedEnumMembers (#10000)GitHub Copilot
  • 2056b238feat(html): port useKeyWithClickEvents a11y rule to HTML (#9495)GitHub Copilot
  • 21a10cfcfix(type-inference): infer callback parameter types from call signatures (OpenAI Codex
  • 97628275feat(js_plugin): runtime AST bindings for JS plugins (#10954)OpenAI Codex
  • d150071bfeat(formatter/yaml): initial implementation for block sequences (#10529)OpenAI Codex

What was excluded

Commits in window1,647
Merge commits removed−36
CI / dependency bots removed−238
Considered1,373

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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