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: 20%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 9 | 2.3% |
| GitHub Copilot | GitHub | 7 | 1.8% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
1a2ef8a5fix(verl): make request aborts take effect on vLLM < 0.9 (pooling_output cClaude Code65df6ab5Rewrite the skills README around how the skill works (#552)Claude Codec632d8ddRestore Python lint checks and extend them to the verl subtree (#553)Claude Code5518551eClarify stable docs release verification (#563)GitHub Copilot4a610aeefeat(async_swe_smith): online GRPO training example for SWE-smith (#34)GitHub Copilot9fcb436bUpdate Search-R1 Llama 3 defaults (#32)GitHub Copilot
What was excluded
| Commits in window | 411 |
| Merge commits removed | −15 |
| CI / dependency bots removed | −0 |
| Considered | 396 |
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 microsoft/agent-lightning