- Dataset
- 2026-09-18-v3.0
- Ruleset
- b2e8889c66f7
- Scanned
- 2026-09-16
- Window
- February–September 15, 2026
01Result
storybookjs/storybook ↗storybookjs/storybook AI coding statistics: 16.9%
Adoption is broad. Many contributors are committing agent-authored work, which is what a real organisational rollout looks like.
02Drivers
What shapes this result
Mode, timing, and detected signatures show whether the result reflects broad adoption or one concentrated workflow.
Assisted or autonomous
Assisted — a developer’s identity authored the commit and the agent added itself as co-author. Autonomous — a bot identity authored the commit without a human identity attached. Across the whole index, 96% of agent commits are assisted.
Agent share by month
| Month | Agent share | Considered commits |
|---|---|---|
| 2026-02 | 8% | 448 |
| 2026-03 | 7.8% | 850 |
| 2026-04 | 16.6% | 743 |
| 2026-05 | 26.3% | 784 |
| 2026-06 | 26.9% | 904 |
| 2026-07 | 11.2% | 705 |
| 2026-08 | 18.2% | 1093 |
| 2026-09 | 12.3% | 381 |
Peak month: 26.9%. Bars are scaled to that peak, not to 100%.
Which agents
| Agent | Vendor | Commits | Share |
|---|---|---|---|
| Cursor Agent | Anysphere | 415 | 7% |
| Claude Code | Anthropic | 330 | 5.6% |
| GitHub Copilot | GitHub | 243 | 4.1% |
| OpenAI Codex | OpenAI | 11 | 0.2% |
03Evidence
Inspect the matches
Public commit samples let you inspect the signatures behind the aggregate result.
Matched commit samples
60f9441eon GitHubManager: Move timeout-detection removal to a separate PRCursor Agente7f59fc8on GitHubManager: Drop client-side server timeout detectionCursor Agentd500a722on GitHubManager: Use a valid close code in node-channel testsCursor Agent47f61bf8on GitHubAdd a copy button to the upgrade command snippetClaude Code14bbacbcon GitHubUse TabList/TabPanel for the upgrade block's package manager tabsClaude Code225e5643on GitHubFix focus indicators and Tab stepping in the mobile about overlayClaude Code61623259on GitHubPotential fix for pull request findingGitHub Copilot82dec992on GitHubApply suggestions from code reviewGitHub Copilotfa2691d8on GitHubPotential fix for pull request findingGitHub Copilot4a76b605on GitHubChore: fix eval formattingOpenAI Codexc4a883e4on GitHubEval: make baseline MDX consumers safeOpenAI Codex3e26b594on GitHubEval: make baseline templates readableOpenAI Codex
04Method
What entered the denominator
The result begins with commit history, removes merges and routine automation, and reports literal agent signatures as a lower bound.
Exclusion ledger
| Commits in window | 8,427 |
| Merge commits removed | −2,493 |
| CI / dependency bots removed | −26 |
| Considered | 5,908 |
Bots are excluded from the denominator entirely. Agent attribution requires a literal supported signature; no code-style inference is used.
05Provenance
Pinned to a source state
This observation names the repository state, release, and detector that produced it. Use these identifiers when reproducing or citing the result.
- Dataset release
- 2026-09-18-v3.0
- Scan date
- 2026-09-16
- Ruleset
- sha256:b2e8889c66f72c18a61839f0bf1a9f77b5481ba2def044dba33c797b2f2bdcae
- Canonical repository
- storybookjs/storybook
- Default branch
- next
- Resolved HEAD
- 4f66ceeb2410de4bcefe3ba3919267495cc40f37 ↗
- Resolved
- 2026-09-16
- Measurement window
- February–September 15, 2026
06Peer context
Position among comparable repositories
The cohort uses the same release and measurement window, then narrows to the repository’s ecosystem and removes low-activity observations.
Midrank percentile; equal shares split the tied positions.
- Repository
- 16.9%
- Cohort median
- 5.4%
- Share rank
- 99 / 376
Percentile = (repositories below + half of 1 tied repository) ÷ 376.
Continue exploring
Related coding-agent evidence
Run the same detector locally.
Deterministic signature matching; no code-style inference. Squash merges can remove trailers, so this result remains a measured floor.
npx qmmit-cli storybookjs/storybook