Byakugan MCP server

by JayOfemi·io.github.JayOfemi/byakugan·v1.0.0

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Private, on-device AI-text analysis including detection, AI-tell spans, and reuse overlap.

A92/100grade A

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Safety scan

A92/100

full report

Adoption

Growing

0 stars31 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Byakugan tools (4, 1 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

check_grammarwrite action
Run a rule-based grammar and style check over the text, fully on-device, and return each issue with its character span, a message, the flagged text, and suggested fixes. Use it to tidy grammar and phrasing, before or after rewriting the flagged AI tells. Deterministic.
check_reuse
Compare the text against reference documents you provide, using word shingles, and return the share of overlap and the verbatim shared passages. This is a local check against the documents passed in. It does not search the web or any plagiarism database. Deterministic.
detect_ai_text
Score how likely a passage reads as AI-written, fully on-device, with a per-signal breakdown and a confidence band. Returns a 0 to 100 likelihood, never a yes/no verdict. The signal is directional and biased against non-native English writers, so treat it as a second opinion and not proof. Get a read here, then call find_ai_tells to locate the spans worth rewriting.
find_ai_tells
Locate the exact character spans that read as AI, covering stock phrasing, long dashes, and formulaic sentence openers. Returns a list of spans with start, end, the matched text, and a note. Use these to rephrase only the flagged parts and leave the rest of the writing intact. Deterministic.

Public scan report

scanner v0.1.9 · 2026-09-26 · same rubric, same numbers if you re-run it

no findings

Code scan19 source files scanned25/25
–Live reliabilityno gateway calls yet and no remote to proben/a
–Tool poisoningtools not inspected (local package is not executed); not countedn/a
Auth qualitylocal package, no credentials required12/15
Maintenancelast push 7 days ago15/15
Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10

Overall 92/100. Components that don't apply are left out of the denominator. Any critical finding is an F.Rubric Appeal a finding JSON

How Byakugan compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score: 92/100; higher than 95% of 48,255 servers
Tools: 4; the typical server has 7
Tools that change things: 25%; typical: 0%. Fewer write tools means less an agent can break
Downloads a week: 31; more than 19% of 12,191 servers with a package

What its tools let an agent do: 3 read · 1 change

Install Byakugan in Claude Code, Cursor or VS Code

Runs npx -y @jayofemi/ai-checker on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add byakugan -- npx -y @jayofemi/ai-checker

Add to Cursor

What the publisher says

From the Byakugan repository's README, as published. We do not edit it. Read it on GitHub

AI Checker

Check whether writing reads as AI, on your own machine, then improve how it reads. Free and open source.

Two ways to use it.

1. In your browser

A static web app. Paste your text and get a read on how AI-like it sounds, with a plain-language explanation, a grammar pass, and a check against your own documents for reuse. Everything runs in the page, and nothing you paste leaves the browser.

Run it locally:

cd site
npm install
npm run dev

2. Inside the AI you already use

A mcp server for your AI assistant (Claude Desktop, an IDE, any MCP client). It gives that AI a detection read plus the exact phrases that read as AI, so your own AI can check and rewrite your writing, on your machine.

For Claude Desktop, add this to claudedesktopconfig.json and restart:

{
  "mcpServers": {
    "ai-checker": {
      "command": "npx",
      "args": ["-y", "@jayofemi/ai-checker"]
    }
  }
}

Claude Code users can install it as a plugin instead: /plugin marketplace add JayOfemi/byakugan, then /plugin install ai-checker@ai-checker.

Then tell your AI "use ai-checker to check this text" and paste what you want checked. Full setup, the tools, and how to verify it are in mcp/README.md.

What to expect

AI-text detection is a signal, not a verdict, and it is biased against non-native English writers. It is shown as a likelihood with its confidence, never a yes/no judgement. Stiff, even, stock-phrase-heavy writing reads high; varied, personal writing reads low. Use it on your own work.

Layout

site/ - the browser checker, a static web app. See site/README.md.
mcp/ - the MCP server and TypeScript library. See mcp/README.md.

Each folder is its own package with its own build. Node 22 (.nvmrc).

License

Nothing above is checked by us. What we check is on the safety report.

Byakugan: common questions

Is Byakugan MCP server safe?: Yes, by our scan: it is graded A (92/100). Read the Byakugan safety report
How do I install Byakugan?: It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Byakugan need an API key?: Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Byakugan maintained?: The last commit was 46 days ago (2026-09-19). The latest release is v1.0.0.
How does Byakugan compare with other MCP servers?: safety score 92/100 (higher than 95% of 48,255 servers); tools 4 (the typical server has 7); tools that change things 25% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.