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: 3.3%. Bars are scaled to that peak, not to 100%.
Which agents
| GitHub Copilot | GitHub | 4 | 0.6% |
| Claude Code | Anthropic | 2 | 0.3% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
a15778c5trie: group 2^N binary trie nodes in serialization (#34794)GitHub Copilot7e388fd0core/state: separate trie reader to mptReader and ubtReader (#34763)GitHub Copilot9b2ce121triedb/pathdb: enhance history index initer (#33640)GitHub Copilotf568ab99internal/telemetry: add gRPC transport for OTLP trace export (#33941)Claude Codeb35645bdbuild: fix missing '!' in shebang of generated oss-fuzz scripts (#34044)Claude Code
What was excluded
| Commits in window | 629 |
| Merge commits removed | −1 |
| CI / dependency bots removed | −0 |
| Considered | 628 |
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 ethereum/go-ethereum