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: 37.5%. Bars are scaled to that peak, not to 100%.
Which agents
| GitHub Copilot | GitHub | 10 | 11.6% |
| Claude Code | Anthropic | 9 | 10.5% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
52bd8d64fix: remove minify plugin to resolve build issuesGitHub Copilot3c89c583fix: copy images to en/ and fix markdown image referencesGitHub Copilot6f83b5e4feat: add image reference validation to lint systemGitHub Copilotdda222c9升级依赖修复 npm 漏洞，禁用新版 markdownlint MD060 规则Claude Code539a2b7aAI 批量重新生成所有菜谱描述，规范化图片alt文本Claude Code1448b50e添加所有菜谱的预估卡路里数据并更新lint规则Claude Code
What was excluded
| Commits in window | 121 |
| Merge commits removed | −5 |
| CI / dependency bots removed | −30 |
| Considered | 86 |
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 Anduin2017/HowToCook