Dataset: 2026-10-27-catalog-ai-v2
Ruleset: b2e8889c66f7
Scanned: 2026-10-27
Window: February–September 15, 2026

Catalog tracking observation. This repository is measured with the same fixed window and ruleset, but it is not part of the published benchmark or its aggregate claims.

A drop-in replacement for react-markdown, designed for AI-powered streaming.

01Result

vercel/streamdown ↗

vercel/streamdown AI coding statistics: 13.1%

of 222 commits in February–September 15, 2026 were committed by an AI agent — a floor, not an estimate

13.1% agent · top contributor 37.9%14 contributors

org-wide

Adoption is broad. Many contributors are committing agent-authored work, which is what a real organisational rollout looks like.

agent commits

193

other considered commits

agent contributors

37.9%

largest contributor

02Drivers

What shapes this result

Mode, timing, and detected signatures show whether the result reflects broad adoption or one concentrated workflow.

Assisted or autonomous

29assisted

0autonomous

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.

Agent share by month

Peak month: 100%. Bars are scaled to that peak, not to 100%.

Which agents

Agent	Vendor	Commits	Share
Claude Code	Anthropic	27	12.2%
Cursor Agent	Anysphere	1	0.5%
GitHub Copilot	GitHub	1	0.5%

03Evidence

Inspect the matches

Public commit samples let you inspect the signatures behind the aggregate result.

Matched commit samples

89c68778 on GitHubfix: re-render memoized components when their output changes (#584)Claude Code
e5deed33 on GitHubMigrate docs site to package-based Geistdocs (#537)Claude Code
9e6f991f on GitHubfix(streamdown): increase dropdown z-index (#463)Claude Code
fa4604b6 on GitHubchore: add minimumReleaseAge: 2880 (#528)Cursor Agent
6f1ea07b on GitHubchore(deps): update remark-cjk-friendly and remark-cjk-friendly-gfm-strikeGitHub Copilot

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	232
Merge commits removed	−0
CI / dependency bots removed	−10
Considered	222

Bots are excluded from the denominator entirely. Agent attribution requires a literal supported signature; no code-style inference is used.

Continue exploring

Claude Code commitsBrowse repositories with detected Claude Code signatures →GitHub Copilot commitsBrowse repositories with detected GitHub Copilot signatures →Cursor Agent commitsBrowse repositories with detected Cursor Agent signatures →TypeScript AI coding statisticsCompare evidence across TypeScript repositories →GitHub AI commit analyzerInspect another repository with the same evidence model →

Reproduce this observation

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 vercel/streamdown

Scan another repository

Try

Month	Agent share	Considered commits
2026-02	9.8%	102
2026-03	26.2%	61
2026-04	0%	1
2026-05	100%	1
2026-07	100%	1
2026-08	2.1%	48
2026-09	0%	8