Adoption is broad. Many contributors are committing agent-authored work, which is what a real organisational rollout looks like.
Assisted or autonomous
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
Peak month: 30%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 13 | 7.2% |
| Cursor Agent | Anysphere | 4 | 2.2% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
b899cd17perf(json-schema): make toJSONSchema(registry) linear in registry size (#6Claude Coded7b209f3docs: point the Web URLs callout at z.httpUrl() (#6410)Claude Code4c27fe87fix(v4): give z.xor() a distinct error when multiple options match (#6376)Claude Coded86df5e0docs: add ArkEnv to ecosystem page (#6203)Cursor Agentc7805073move Sanity and Mintlify to top of sponsor listsCursor Agent7d98c909add Sanity as silver sponsor and Mintlify as bronze sponsorCursor Agent
What was excluded
| Commits in window | 193 |
| Merge commits removed | −1 |
| CI / dependency bots removed | −11 |
| Considered | 181 |
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 colinhacks/zod