10.3%

of 1,469 commits were committed by an AI agent — a floor, not an estimate

10.3% agent · top contributor 55.9%22 contributors

team

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

152

agent commits

1,317

human commits

agent contributors

55.9%

largest contributor

Assisted or autonomous

152assisted

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: 23.8%. Bars are scaled to that peak, not to 100%.

Which agents

Cursor Agent	Anysphere	66	4.5%
GitHub Copilot	GitHub	45	3.1%
Claude Code	Anthropic	40	2.7%
OpenAI Codex	OpenAI	3	0.2%

Verify it yourself

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

0419bb8ffeat(table): `show only` columns from the column menu and explorer (#10768Cursor Agent
1ee282bdfix: map geoarrow to geoarrow-types (#10659)Cursor Agent
ad02456ffix(tests): compare Pygments HTML output semantically across 2.19–2.21 (#1Cursor Agent
bb3532acfix: preserve unqualified references in methods (#10679)GitHub Copilot
3a1b1dabfeat: lint rule for private imports (#10580)GitHub Copilot
f1b3678afix: slurm script regression and docs/examples update (#10469)GitHub Copilot
5aa823f9fix(markdown): render display math nested in list item continuations (#107Claude Code
b4181abafix(vega): use ctrl for chart pan/zoom on non-mac platforms (#3812) (#1049Claude Code
3955fdf9fix(matplotlib): derive canvas draw scale from the backing store (#10626)Claude Code
b8c9ce29feature: Infer file browser initial path from initial value (#10362)OpenAI Codex
6faa194dfeat: support default file browser selection (#10255)OpenAI Codex
3b2f21a5bug: formatting of exposed classes preserves class decorators (#10042)OpenAI Codex

What was excluded

Commits in window	1,530
Merge commits removed	−0
CI / dependency bots removed	−61
Considered	1,469

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 marimo-team/marimo

Scan another repository

Try