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: 2.9%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 5 | 0.6% |
| GitHub Copilot | GitHub | 1 | 0.1% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
6a4f61b6chore: Add @jja725 (Jianjian Xie) as module committer (#28401)Claude Code49b7cc43feat(plugin-lance): Integrate lance-namespace API (#27481)Claude Code6569b05efeat(plugin-openlineage-event-listener): Emit indirect column lineage as IClaude Code7cbd1a17fix: Report native worker cache and query memory separately in /v1/status GitHub Copilot
What was excluded
| Commits in window | 824 |
| Merge commits removed | −0 |
| CI / dependency bots removed | −28 |
| Considered | 796 |
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 prestodb/presto