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Arbitype MCP server

by Renwang-Huang·io.github.Renwang-Huang/arbitype·v0.7.0
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Typed decision tools for AI agents, powered by TypeSafe Jev.

B83/100grade B
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Safety scan
B83/100

full report

Adoption
Growing

0 stars12 downloads/wk

Reviews

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

Arbitype tools

No tool declarations could be read from the package source. They show once the server is installed.

Public scan report

scanner v0.1.10 · 2026-11-01 · same rubric, same numbers if you re-run it

no findings
  • Code scan24 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 qualitystatic API keys via environment variables6/15
  • Maintenancelast push 6 days ago15/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 83/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Arbitype compares

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

Safety score
83/100
higher than 65% of 48,255 servers
Downloads a week
12
more than 3% of 12,191 servers with a package

Release history: 2 versions in the registry since 2026-09-22, latest 2026-09-22, typically several a day.

Install Arbitype in Claude Code, Cursor or VS Code

claude mcp add arbitype -- uvx arbitype
Add to Cursor

What the publisher says

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

Arbitype

Typed decision tools for AI agents.

Classify · Score · Verify · Gate · Route · Review

MCP-native · Powered by TypeSafe Jev

Quick start · Why Arbitype? · Tools · Host setup · Configuration · PyPI · MCP Registry · Glama · Engineering benchmark

Arbitype is an MCP-native typed decision layer for AI agents, powered by TypeSafe Jev. It turns probabilistic judgments into structured decision primitives that an agent or program can consume directly.

[!NOTE]

Arbitype is an independent open-source project. It is not an official

TypeSafe AI product or an official integration for any particular agent host.

<!-- mcp-name: io.github.Renwang-Huang/arbitype -->

Quick start

The fastest way to connect an MCP host is a local STDIO server launched by uvx:

export TYPESAFE_API_KEY="your-key"
uvx arbitype

The API key stays in the process environment. It is not an MCP argument and is never printed to standard output.

For a pinned, reproducible launch:

uvx --from 'arbitype==0.6.0' arbitype

Or install the package into the current environment:

python -m pip install arbitype
arbitype

Or run the repository checkout:

git clone https://github.com/Renwang-Huang/arbitype.git
cd arbitype
export TYPESAFE_API_KEY="your-key"
python3 server.py

Why Arbitype?

Generative models are excellent at prose, code, and open-ended generation. Agent workflows also need bounded decisions that software can branch on:

free-form state
      ↓
  TypeSafe Jev
      ↓
probabilistic judgment
      ↓
    Arbitype
      ↓
typed decision + probability
      ↓
agent / code branch

Arbitype provides that decision layer over MCP. It exposes short, host-neutral primitives for classification, scoring, verification, routing, review, and fail-closed gate signals. The result is structured data, not a paragraph that an agent must interpret again.

Architecture

Shortened. The full README is on GitHub.

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

Arbitype: common questions

Is Arbitype MCP server safe?
Mostly: it is graded B (83/100). Read the Arbitype safety report
How do I install Arbitype?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Arbitype need an API key?
Yes. The registry entry asks for TYPESAFE_API_KEY.
Is Arbitype maintained?
The last commit was 9 days ago (2026-10-26). The latest release is v0.7.0.
What can I use instead of Arbitype?
Servers from other publishers that do the same job: Ask Jev MCP server.
How does Arbitype compare with other MCP servers?
safety score 83/100 (higher than 65% of 48,255 servers); downloads a week 12 (more than 3% of 12,191 servers with a package). Full comparison.

Alternatives to Arbitype

Same job from other publishers: the closest match first, then the best rated.

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