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: 16.8%. Bars are scaled to that peak, not to 100%.
Which agents
| GitHub Copilot | GitHub | 106 | 7.8% |
| Claude Code | Anthropic | 6 | 0.4% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
7e6515c7chunk python files to avoid ARG_MAX limit in ruff batch checkGitHub Copilot9f9882darefactor run_check_files: batch ruff check for python filesGitHub Copilot56738b5cRevert PR 3199/3204 appearance changes to preferences dialog main screenGitHub Copilot3861e35eTTS: emit cancel when the engine reports an errorClaude Codebd7757dbAdd Briefing Service recipeClaude Codec33f0a54SNB input: fix IndexError by keeping entry filenames as strClaude Code
What was excluded
| Commits in window | 1,574 |
| Merge commits removed | −192 |
| CI / dependency bots removed | −26 |
| Considered | 1,356 |
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 kovidgoyal/calibre