53.4%

of 1,344 commits were committed by an AI agent — a floor, not an estimate

53.4% agent · top contributor 20.5%104 contributors

org-wide

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

718

agent commits

626

human commits

104

agent contributors

20.5%

largest contributor

Assisted or autonomous

567assisted

151autonomous

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: 74.1%. Bars are scaled to that peak, not to 100%.

Which agents

GitHub Copilot	GitHub	457	34%
Claude Code	Anthropic	287	21.4%
Cursor Agent	Anysphere	5	0.4%

Verify it yourself

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

c256ceabAdd Evaluator Contract extension to community catalog (#4420)GitHub Copilot
a369c5c2[extension] Add Axi Extension to community catalog (#4412)GitHub Copilot
8da51c1b[extension] Update Charter extension to v0.6.1 (#4409)GitHub Copilot
db648699fix(workflows): require a 'steps' body on while and do-while loops (#4149)Claude Code
0053c3a3fix(workflows): keep non-ASCII text readable in written overlay files (#41Claude Code
15dffed1fix(workflows): report overlay operation keys in declaration order (#4146)Claude Code
39f2ac3cclarify: require real interrogatives, ban topic-label questions (#3745)Cursor Agent
82c078bbdocs: clarify that release tags keep the leading v prefix (#3463)Cursor Agent
8e5643d4fix(cursor-agent): enable headless CLI dispatch end-to-end (-p --trust --aCursor Agent

What was excluded

Commits in window	1,394
Merge commits removed	−3
CI / dependency bots removed	−47
Considered	1,344

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 github/spec-kit

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