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mrdoob/three.js ↗
10.7%
of 1,067 commits were committed by an AI agent — a floor, not an estimate
10.7% agent · top contributor 59.6%14 contributors
team

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

114
agent commits
953
human commits
14
agent contributors
59.6%
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: 17.1%. Bars are scaled to that peak, not to 100%.

Which agents

Claude CodeAnthropic11110.4%
GitHub CopilotGitHub40.4%
Cursor AgentAnysphere20.2%

Verify it yourself

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

  • 444f238cDevTools: Object details, box highlight and 1.18. (#34399)Claude Code
  • 2dc6d9a6DevTools: Clean up, light count and 1.17. (#34387)Claude Code
  • c7cf2d06Nodes: Remove top-level side effects for better tree-shaking. (#34332)Claude Code
  • 77053e2bPMREMGenerator: Replace separable blur with spiral blur on both renderers GitHub Copilot
  • 0d298629Add `SSAONode` and `depthAwareBlur` (#33921)GitHub Copilot
  • 3e3d7776Material: Fixed setValues() to honor Euler and Vector2 types. (#33476)GitHub Copilot
  • 95507a65WebGLRenderer: Unbind PIXEL_PACK_BUFFER after async readback. (#34321)Cursor Agent
  • fef39719Materialx upgrade (#33485)Cursor Agent

What was excluded

Commits in window1,151
Merge commits removed−0
CI / dependency bots removed−84
Considered1,067

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 mrdoob/three.js

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