14.4%

of 5,422 commits were committed by an AI agent — a floor, not an estimate

14.4% agent · top contributor 34.5%125 contributors

org-wide

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

780

agent commits

4,642

human commits

125

agent contributors

34.5%

largest contributor

Assisted or autonomous

509assisted

271autonomous

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

Jan26

Feb26

Mar26

Apr26

May26

Jun26

Jul26

Aug26

Sep26

Peak month: 28.7%. Bars are scaled to that peak, not to 100%.

Which agents

Claude Code	Anthropic	472	8.7%
Devin	Cognition	281	5.2%
Cursor Agent	Anysphere	22	0.4%
GitHub Copilot	GitHub	12	0.2%

Verify it yourself

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

2810b716fix(observability): forward exact OpenRouter costs to Langfuse (#20336)Claude Code
cf28f10dfix(playground): collect auth headers on the blocked screen (#21214)Claude Code
cf9cd796refactor(core): fold text and reasoning spans through one shared unit (#23Claude Code
b0f9b0c0docs: revert documentation changes from #23077 (#24031)Devin
8365094adocs: move client-js agent controller events into a Client SDK reference pDevin
74f60debdocs: cover the client-js path in agent controller "Connect a UI" (#22788)Devin
164e197afix: bump vulnerable dependencies to patched releases (#24027)Cursor Agent
53d72502fix: bump fastify/fast-uri and related High vulns (SEC-170/171) (#23665)Cursor Agent
571d66f6fix(evals): honor empty trajectories and nested blacklist failures (#23505Cursor Agent
b390381cfix(e2b, blaxel): S3 mount race condition and partial credential validatioGitHub Copilot
975c59aefeat(core): make agentic-loop serialization-safe on the evented engine (#1GitHub Copilot
65f255a3fix(core): guard CacheKeyGenerator against empty/undefined reasoning detaiGitHub Copilot

What was excluded

Commits in window	6,963
Merge commits removed	−0
CI / dependency bots removed	−1,541
Considered	5,422

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 mastra-ai/mastra

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