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: 100%. Bars are scaled to that peak, not to 100%.
Which agents
| GitHub Copilot | GitHub | 18 | 40% |
| Cursor Agent | Anysphere | 2 | 4.4% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
292f0b80Fix formatting of note in RNNTF.ipynbGitHub Copilot6e767e6dUpdate loss description and gradient computation detailsGitHub Copilot7290b985Potential fix for pull request findingGitHub Copilot83509895docs: fix chain rule wording in backprop explanationCursor Agentcbe84fd0fix: correct backpropagation chain rule in OwnFramework notebookCursor Agent
What was excluded
| Commits in window | 251 |
| Merge commits removed | −58 |
| CI / dependency bots removed | −148 |
| Considered | 45 |
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/AI-For-Beginners