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: 92.1%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 251 | 28.9% |
| Cursor Agent | Anysphere | 11 | 1.3% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
41fcb4d5fix(env): add LAST30DAYS_SKIP_KEYCHAIN so tests can seal the Keychain sourClaude Code1353532cdocs: compound the fusion dedupe learning and fix a doubled #906 link in tClaude Codeb28775e4fix(reddit): restore the keyless Reddit lane (comments, ranking, pacing) (Claude Code56ba5acefix(skill): Grok Bot / Cursor agent chat is a hidden-link citation host (LCursor Agent41fcb4d5fix(env): add LAST30DAYS_SKIP_KEYCHAIN so tests can seal the Keychain sourCursor Agentdc25291ffix: continue research after optional X skip (rewrite of #1077 onto extrasCursor Agent
What was excluded
| Commits in window | 1,146 |
| Merge commits removed | −231 |
| CI / dependency bots removed | −46 |
| Considered | 869 |
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 mvanhorn/last30days-skill