Rein MCP

Rein MCP implements the Guard as an MCP server, allowing any MCP-capable harness to provide agents with a spend-governed fetch. It enforces policy checks before payments are constructed, ensuring agents operate within defined budgets and caps while maintaining a non-custodial architecture where funds never pass through Rein.

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Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Community listingLocal stdioSource reviewed; not executedPublished by Rein

Vendor documentation

What you can do with it

Wrap agent fetch calls with policy enforcement
Enforce per-payment caps and rolling budgets
Provide read-only introspection of spending rules
Deny payments before they are signed or sent

Source and maintenance

Community listingRegistry 0.8.0

mcp-registry: io.github.bugiiiii11/rein@0.8.0 Source repository Project website

Maintenance checked: Oct 31, 2026, 10:27 PM UTC

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

@reinconsole/mcp 0.8.0

npm

@reinconsole/mcp package definition

{
  "version": "0.8.0",
  "transport": "stdio",
  "identifier": "@reinconsole/mcp",
  "registryType": "npm",
  "environmentVariables": [
    {
      "name": "REIN_AGENT_FILE",
      "format": "filepath",
      "description": "Path to the rein-agent.json written by `npx @reinconsole/init` (engine URL, agent id, API key, wallet)."
    },
    {
      "name": "REIN_ENGINE_URL",
      "description": "Policy engine base URL. Required unless REIN_AGENT_FILE is set."
    },
    {
      "name": "REIN_AGENT_ID",
      "description": "The one agent this server speaks for. Required unless REIN_AGENT_FILE is set."
    },
    {
      "name": "REIN_ENGINE_API_KEY",
      "description": "Bearer key for the engine, ideally an evaluate key narrowed to this agent."
    },
    {
      "name": "REIN_PAYER_PRIVATE_KEY",
      "description": "Agent wallet key. Omit for advisory mode: policy is checked, nothing is paid."
    },
    {
      "name": "REIN_NETWORK_PROFILE",
      "description": "testnet (default) or mainnet: which network's 402s this server will pay."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.

Cursor configuration

{
  "mcpServers": {
    "rein-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@reinconsole/mcp@0.8.0"
      ],
      "env": {
        "REIN_AGENT_FILE": "<YOUR_REIN_AGENT_FILE>",
        "REIN_ENGINE_URL": "<YOUR_REIN_ENGINE_URL>",
        "REIN_AGENT_ID": "<YOUR_REIN_AGENT_ID>",
        "REIN_ENGINE_API_KEY": "<YOUR_REIN_ENGINE_API_KEY>",
        "REIN_PAYER_PRIVATE_KEY": "<YOUR_REIN_PAYER_PRIVATE_KEY>",
        "REIN_NETWORK_PROFILE": "<YOUR_REIN_NETWORK_PROFILE>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.

Cline configuration

{
  "mcpServers": {
    "rein-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@reinconsole/mcp@0.8.0"
      ],
      "env": {
        "REIN_AGENT_FILE": "<YOUR_REIN_AGENT_FILE>",
        "REIN_ENGINE_URL": "<YOUR_REIN_ENGINE_URL>",
        "REIN_AGENT_ID": "<YOUR_REIN_AGENT_ID>",
        "REIN_ENGINE_API_KEY": "<YOUR_REIN_ENGINE_API_KEY>",
        "REIN_PAYER_PRIVATE_KEY": "<YOUR_REIN_PAYER_PRIVATE_KEY>",
        "REIN_NETWORK_PROFILE": "<YOUR_REIN_NETWORK_PROFILE>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.

VS Code configuration

{
  "servers": {
    "rein-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@reinconsole/mcp@0.8.0"
      ],
      "env": {
        "REIN_AGENT_FILE": "<YOUR_REIN_AGENT_FILE>",
        "REIN_ENGINE_URL": "<YOUR_REIN_ENGINE_URL>",
        "REIN_AGENT_ID": "<YOUR_REIN_AGENT_ID>",
        "REIN_ENGINE_API_KEY": "<YOUR_REIN_ENGINE_API_KEY>",
        "REIN_PAYER_PRIVATE_KEY": "<YOUR_REIN_PAYER_PRIVATE_KEY>",
        "REIN_NETWORK_PROFILE": "<YOUR_REIN_NETWORK_PROFILE>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.

Claude Desktop configuration

{
  "mcpServers": {
    "rein-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@reinconsole/mcp@0.8.0"
      ],
      "env": {
        "REIN_AGENT_FILE": "<YOUR_REIN_AGENT_FILE>",
        "REIN_ENGINE_URL": "<YOUR_REIN_ENGINE_URL>",
        "REIN_AGENT_ID": "<YOUR_REIN_AGENT_ID>",
        "REIN_ENGINE_API_KEY": "<YOUR_REIN_ENGINE_API_KEY>",
        "REIN_PAYER_PRIVATE_KEY": "<YOUR_REIN_PAYER_PRIVATE_KEY>",
        "REIN_NETWORK_PROFILE": "<YOUR_REIN_NETWORK_PROFILE>"
      }
    }
  }
}

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