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: 12.5%. Bars are scaled to that peak, not to 100%.
Which agents
| GitHub Copilot | GitHub | 9 | 2.6% |
| Claude Code | Anthropic | 4 | 1.2% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
645e1317fixes #25796; fixes procParamTypeRel to ensure backend type consistency (#GitHub Copilote9a0c963fixes #25784; Object default field initialized with an object constructor GitHub Copilot854c1f15fixes #25687; optimizes seq assignment for orc (#25689)GitHub Copilote927887bfix SIGSEGV on refc: genGenericAsgn must deep-copy from static data (#2616Claude Code27763495lexer: add seven more unicode operators (#26074)Claude Codeb6842c14fix(uri): `?` operator now appends to existing query string (#25831)Claude Code
What was excluded
| Commits in window | 351 |
| Merge commits removed | −0 |
| CI / dependency bots removed | −9 |
| Considered | 342 |
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 nim-lang/Nim