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: 90%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 433 | 80.8% |
| GitHub Copilot | GitHub | 7 | 1.3% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
0e156b0afix(muya): remove the selected rest of a list or quote when a cut starts iClaude Codee5422625fix(muya): keep the code block when a cut ends in its language line (#5371Claude Code555f3a72fix(muya): collapse only the nested code block when a cut starts in its laClaude Code26825e77fix: replace remaining absolute raw.githubusercontent.com URLs with relatiGitHub Copilotf7100c27fix: build error when build mac target (#4232)GitHub Copilot0c8eadb6i18n: translate sponsor section in all language READMEs (#4209)GitHub Copilot
What was excluded
| Commits in window | 543 |
| Merge commits removed | −7 |
| CI / dependency bots removed | −0 |
| Considered | 536 |
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 marktext/marktext