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vitest-dev/vitest ↗
16.5%
of 691 commits were committed by an AI agent — a floor, not an estimate
16.5% agent · top contributor 74.6%20 contributors
team

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

114
agent commits
577
human commits
20
agent contributors
74.6%
largest contributor

Assisted or autonomous

114assisted
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: 28.3%. Bars are scaled to that peak, not to 100%.

Which agents

OpenAI CodexOpenAI649.3%
Claude CodeAnthropic466.7%
GitHub CopilotGitHub121.7%
Cursor AgentAnysphere10.1%

Verify it yourself

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

  • cbbea0b7docs: fix internal links to config options (#11240)OpenAI Codex
  • a47d7908fix(fakeTimers): force `queueMicrotask` and `nextTick` in `toNotFake` (#11OpenAI Codex
  • 05982297fix(ui): fix explorer file summary count (#11125)OpenAI Codex
  • f08ce4b7fix: apply queued mocks from doMock() in queue order (fixes #10706) (#1112Claude Code
  • 1e9f80ecperf(vm): don't prewarm modules the worker never requests (#11033)Claude Code
  • c3ba16b3fix(vm): fall back to compiling from source when a module's code cache is Claude Code
  • 613c7706chore: remove direct `esbuild` devDependency (#10849)GitHub Copilot
  • 3d421d4echore: setup PR-driven release pipeline (#10550)GitHub Copilot
  • 62756547fix: fix mixed stdout/stderr log timestamps in `onUserConsoleLog` (#10308)GitHub Copilot
  • 209b1b0efeat(ui): add duration sorting to explorer (#9603)Cursor Agent

What was excluded

Commits in window743
Merge commits removed−0
CI / dependency bots removed−52
Considered691

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 vitest-dev/vitest

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