42.3%

of 279 commits were committed by an AI agent — a floor, not an estimate

42.3% agent · top contributor 72%29 contributors

team

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

118

agent commits

161

human commits

agent contributors

72%

largest contributor

Assisted or autonomous

115assisted

3autonomous

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

Apr26

May26

Jun26

Jul26

Aug26

Sep26

Peak month: 67.3%. Bars are scaled to that peak, not to 100%.

Which agents

Claude Code	Anthropic	116	41.6%
Cursor Agent	Anysphere	2	0.7%

Verify it yourself

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

1bcdf1b0fix(build): prepare npm git installs without pnpm (#792)Claude Code
2fa679f1fix(schema): make schema init --default actually set the default (#1709)Claude Code
e5e350d0fix(explore): use ASCII in diagram examples (#1010)Claude Code
18cbf5d3fix(parser): ignore fenced code blocks when parsing delta specs (#1151)Cursor Agent
9aded17afix(validator): hint when SHALL/MUST appears only in requirement header (#Cursor Agent

What was excluded

Commits in window	307
Merge commits removed	−0
CI / dependency bots removed	−28
Considered	279

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 Fission-AI/OpenSpec

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