A small group is using agents. Adoption has spread beyond one person but is not project-wide.
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: 39.1%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 40 | 7.2% |
| GitHub Copilot | GitHub | 28 | 5.1% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
d8a83827[BUGFIX beta] Destroy dynamic modifiers that were set after the initial reClaude Code14f95cea[BUGFIX beta] Add failing tests for dynamic modifier teardownClaude Codeb6e26a9eRemove dead opcodesClaude Code1adb8addHandle Safari weak collection error message variantsGitHub Copilot38022d94Fix glob v13 import compatibility in build scriptsGitHub Copilot5fdaaef2Remove component-lookup: delete file and all referencesGitHub Copilot
What was excluded
| Commits in window | 847 |
| Merge commits removed | −261 |
| CI / dependency bots removed | −34 |
| Considered | 552 |
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 emberjs/ember.js