TypeSafe MCP server

Arbitype

Typed decision tools for AI agents.

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MCP-native · Powered by TypeSafe Jev

Quick start · Why Arbitype? · Tools · Benchmarks · Documentation

What is Arbitype?

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.

Arbitype is available on PyPI and the official MCP Registry.

[!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:

~~~bash export TYPESAFEAPIKEY="your-key" uvx arbitype ~~~

For a pinned, reproducible launch:

~~~bash uvx --from 'arbitype==0.7.0' arbitype ~~~

Or install the package into the current environment:

~~~bash python -m pip install arbitype arbitype ~~~

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

Host setup

Inspect detected hosts before writing anything:

~~~bash arbitype setup --detect --dry-run ~~~

Then apply a reviewed plan:

~~~bash arbitype setup codex arbitype doctor --json ~~~

The setup flow is plan → unified diff → confirmation → backup → apply. Use claude, cursor, or vscode in place of codex. Detailed host formats, secret forwarding, --yes, --remove, ownership, and non-interactive behavior are documented in docs/HOST_SETUP.md.

Configuration

At minimum, set TYPESAFEAPIKEY. To select a model explicitly:

~~~bash export TYPESAFEAPIKEY="your-key" export TYPESAFE_MODEL="jev-latest" ~~~

See the full configuration reference for endpoints, timeouts, retries, and request/response limits.

Compatibility

arbitype is the canonical distribution, Python package, and CLI. Existing TypeSafe MCP users should migrate to Arbitype; see docs/REGISTRY_MIGRATION.md.

For the safe migration from the historical distribution:

~~~bash python -m pip uninstall typesafe-mcp python -m pip install arbitype ~~~

Shortened. The full README is on GitHub.