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astral-sh/ruff ↗
2.2%
of 2,687 commits were committed by an AI agent — a floor, not an estimate
2.2% agent · top contributor 32.8%19 contributors
org-wide

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

58
agent commits
2,629
human commits
19
agent contributors
32.8%
largest contributor

Assisted or autonomous

58assisted
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: 5.2%. Bars are scaled to that peak, not to 100%.

Which agents

Claude CodeAnthropic491.8%
OpenAI CodexOpenAI90.3%
GitHub CopilotGitHub10%

Verify it yourself

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

  • fca5c7cfFix duplicated "of" in ClientOptions doc comment (#27978)Claude Code
  • 5428c216[ty] Expand nested union aliases when finding a TypedDict or callable (#27Claude Code
  • a9130f33[`pyupgrade`] Add rule to replace `while 1` with `while True` (`while-one`Claude Code
  • a2a71c59[ty] Add first-class support for enum complements (#24961)OpenAI Codex
  • f3b59046[ty] Hoist path assignment implication checks (#25107)OpenAI Codex
  • ac6361d8[ty] Include severity in JUnit diagnostics (#25080)OpenAI Codex
  • e51e1328[`flake8-async`] Implement `yield-in-context-manager-in-async-generator` (GitHub Copilot

What was excluded

Commits in window3,181
Merge commits removed−0
CI / dependency bots removed−494
Considered2,687

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 astral-sh/ruff

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