One person is driving this. The headline number reflects a single contributor's workflow, not a project-wide shift.
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: 2.7%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 6 | 0.7% |
| GitHub Copilot | GitHub | 3 | 0.3% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
52039217[build] Automated Browser Version Update (#18021)Claude Codef3ccc604[java] Remove deprecated GET /session/{sessionId}/se/files/{fileName} endpClaude Code05423ea3[py] wire print_pdf_tests.py into the browser test suites (#17976)Claude Code6b85c4a5[rb] Fix credential issue with private key (#17188)GitHub Copilot4885286c[dotnet][java][js][py][rb] Standardize README files across bindings (#1724GitHub Copilotd512ddcefix(documentation): update artifact naming for generated docs (#17332)GitHub Copilot
What was excluded
| Commits in window | 920 |
| Merge commits removed | −0 |
| CI / dependency bots removed | −0 |
| Considered | 920 |
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 SeleniumHQ/selenium