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microsoft/fluentui ↗
22.4%
of 541 commits were committed by an AI agent — a floor, not an estimate
22.4% agent · top contributor 41.3%17 contributors
org-wide

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

121
agent commits
420
human commits
17
agent contributors
41.3%
largest contributor

Assisted or autonomous

119assisted
2autonomous

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: 43.5%. Bars are scaled to that peak, not to 100%.

Which agents

GitHub CopilotGitHub6311.6%
Claude CodeAnthropic6211.5%
Cursor AgentAnysphere10.2%

Verify it yourself

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

  • 43665d5ffix(react-headless-components-preview): add state data attributes (#36712)GitHub Copilot
  • f51ba357test: add axe checks to headless conformance (#36576)GitHub Copilot
  • 5695ba9aPreserve inline CSF3 story parameters in full-source preset (#36661)GitHub Copilot
  • 2fddca2dfix(react-headless-components-preview): publish context readers from the bClaude Code
  • d3b573a7fix(react-headless-components-preview): provide MenuSplitGroup's context (Claude Code
  • 62aee4c9fix(react-breadcrumb): make BreadcrumbButtonBaseProps distribute over the Claude Code
  • 4756919ffeat(react-headless-components-preview): add Dialog component (#35996)Cursor Agent

What was excluded

Commits in window545
Merge commits removed−0
CI / dependency bots removed−4
Considered541

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 microsoft/fluentui

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