One person is driving this. The headline number reflects a single contributor's workflow, not a project-wide shift.
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: 37.3%. Bars are scaled to that peak, not to 100%.
Which agents
| Cursor Agent | Anysphere | 33 | 15.8% |
| Claude Code | Anthropic | 4 | 1.9% |
| GitHub Copilot | GitHub | 1 | 0.5% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
2407c712📝 Update CHANGELOG.mdCursor Agentf33e820a📝 Update CHANGELOG.mdCursor Agent09c254a2📝 Update CHANGELOG.mdCursor Agent36485831fix(no_NO): compute Norwegian MOD11 check digit so iban() passes stdnum vaClaude Code215fc011fix(es_ES): generate valid Spanish CCC control digits in iban() (#2404)Claude Code41624e3bfix(de_DE): compute valid ISO 7064 Mod 11,10 check digit for vat_id (#2403Claude Code02bd52b2French social security numbers - corsican codes (#2373)GitHub Copilot
What was excluded
| Commits in window | 215 |
| Merge commits removed | −1 |
| CI / dependency bots removed | −5 |
| Considered | 209 |
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 joke2k/faker