Adoption is broad. Many contributors are committing agent-authored work, which is what a real organisational rollout looks like.
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: 54.4%. Bars are scaled to that peak, not to 100%.
Which agents
| GitHub Copilot | GitHub | 502 | 43.1% |
| Claude Code | Anthropic | 3 | 0.3% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
aec28b28Exclude Helix Job Monitor from Dependabot updates (#69331)GitHub Copilote0ec5cd4Fix flaky HTTP/3 request trailers test (#69246)GitHub Copilot713bc59eUnquarantine HubConnectionTests.LongPollingUsesHttp2ByDefault (issue #5018GitHub Copilot9cf09cfcFix BL0012 false positive on await foreach and await using (#68720)Claude Coded31f07dcAdd OpenApiGenerationEnvironment property support for API description servClaude Codea1c5f7c6Respect IModelNameProvider when matching OpenAPI parameters (#64535)Claude Code
What was excluded
| Commits in window | 1,537 |
| Merge commits removed | −114 |
| CI / dependency bots removed | −257 |
| Considered | 1,166 |
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 dotnet/aspnetcore