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: 51%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 148 | 17.2% |
| GitHub Copilot | GitHub | 13 | 1.5% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
17b0e2f2Add concrete powder colors to map preview paletteClaude Codee1523e8dTrim allocations at scale and fix the steep-water filter on small blobsClaude Code88deb5d7Bound the flowing-water coarse field by a cell budgetClaude Code209fd961Address review feedbackGitHub Copilot287c594bUse per-section block palettesGitHub Copilota8b4518bRemove magma blocks from water body floorsGitHub Copilot
What was excluded
| Commits in window | 1,193 |
| Merge commits removed | −299 |
| CI / dependency bots removed | −33 |
| Considered | 861 |
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 louis-e/arnis