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: 19.7%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 16 | 10.5% |
| GitHub Copilot | GitHub | 1 | 0.7% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
c7830597fix(lesson-quiz): shuffle answer options and add per-round feedback (#76)Claude Code5f50791ffix(quiz): correct Q4 extended thinking toggle wording (#109)Claude Coded2ead3bafix(extended-thinking): correct fictional /think command to valid ultrathiClaude Codef53d0809Add performance-optimizer subagent and dependency-check hook (#36)GitHub Copilot
What was excluded
| Commits in window | 156 |
| Merge commits removed | −4 |
| CI / dependency bots removed | −0 |
| Considered | 152 |
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 luongnv89/claude-howto