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: 28.1%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 84 | 19.5% |
| GitHub Copilot | GitHub | 2 | 0.5% |
| Devin | Cognition | 1 | 0.2% |
| Cursor Agent | Anysphere | 1 | 0.2% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
c5e5d4f6Match the uv tool-list entry, not a substringClaude Codef533f9e1Only hint at pip when uv does not manage the installClaude Codedf3cbc55Tell pip and pipx users how to upgrade when uv tool upgrade failsClaude Codefd3e25c9feat: add field-tested Flipkart shopping domain skillGitHub Copilotd0ebf863Add Expedia domain skill: hotel search automationGitHub Copilot4720fe43Add MCP server wrapper over browser-harness helpers.Devince35175bUpdate README bitter lesson and skills footer linksCursor Agent
What was excluded
| Commits in window | 635 |
| Merge commits removed | −205 |
| CI / dependency bots removed | −0 |
| Considered | 430 |
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 browser-use/browser-harness