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Guardrails MCP Server

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Guardrails MCP Server

MCP (Model Context Protocol) server for Guardrails — the conscience layer for autonomous agents.

Allows any MCP-compatible AI agent (Claude, Cursor, Windsurf, etc.) to natively use Guardrails to check user values, make aligned decisions, and respect faith-based preferences.

Transport

Streamable HTTP (MCP spec 2025-03-26) at /mcp endpoint.

Tools

Tool

Description

create_profile

Create a new user values profile

get_profile

Retrieve a user's values profile

update_profile

Update profile domains

check

Rule-based compatibility check

decide

LLM-powered decision (premium, BYOK)

calendar

Faith-aware calendar/scheduling

get_taxonomies

List available value domains

list_configurations

List custom configs

create_configuration

Create custom config

update_configuration

Update custom config

delete_configuration

Delete custom config

Agent Configuration

Claude Desktop / Cursor / Windsurf

Add to your MCP config:

{
  "mcpServers": {
    "guardrails": {
      "url": "https://mcp.useguardrails.com/mcp"
    }
  }
}

Every tool requires your Guardrails api_key as a parameter.

Environment Variables

Variable

Default

Description

PORT

3001

Server port

GUARDRAILS_API_URL

https://api.useguardrails.com

Guardrails REST API base URL

Development

npm install
npm run dev

Deployment

Deployed as a separate Railway service in the same project as the API.

This server cannot be deployed

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Resources

Related MCP Connectors