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: 83%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 491 | 35% |
| GitHub Copilot | GitHub | 322 | 23% |
| Gemini CLI | 19 | 1.4% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
fdbb8ff6📒 docs: say where Resolve stops walking structureClaude Code8794094a🧹 chore: pin the provenance recovered from a cached IDClaude Code4e5c318c🧹 chore: drive the pool type guard from an isolated poolClaude Code9b7a726fPreserve shared id for merged route registrationGitHub Copilotb3700066Potential fix for pull request findingGitHub Copilotc729e6ffPotential fix for pull request findingGitHub Copilot04accab0Update internal/nilerror/nilerror.goGemini CLIf4cdca17Update .github/README.mdGemini CLI3b366694Update .github/README.mdGemini CLI
What was excluded
| Commits in window | 2,259 |
| Merge commits removed | −634 |
| CI / dependency bots removed | −224 |
| Considered | 1,401 |
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 gofiber/fiber