A small group is using agents. Adoption has spread beyond one person but is not project-wide.
Assisted or autonomous
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
Peak month: 17.1%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 101 | 10.6% |
| GitHub Copilot | GitHub | 4 | 0.4% |
| Cursor Agent | Anysphere | 1 | 0.1% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
c58dc9a7Examples: Replace sun-like DirectionalLights with SunLight. (#34228)Claude Codec6a56a8eWebGLRenderer: Add SunLight with cascaded shadow maps. (#34221)Claude Codec57d5d27E2E: Try to fix the webgpu async timeouts (#34225)Claude Code77053e2bPMREMGenerator: Replace separable blur with spiral blur on both renderers GitHub Copilot0d298629Add `SSAONode` and `depthAwareBlur` (#33921)GitHub Copilot3e3d7776Material: Fixed setValues() to honor Euler and Vector2 types. (#33476)GitHub Copilotfef39719Materialx upgrade (#33485)Cursor Agent
What was excluded
| Commits in window | 1,025 |
| Merge commits removed | −0 |
| CI / dependency bots removed | −76 |
| Considered | 949 |
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