GuardRails-MCP

MCP server · by TAM-DS

Developer Tools Python v0.1.1

Local prompt regression tracker with six fictional cases and evidence for human review.

View source ↗ Generate config for multiple servers More servers

Install

Pin version registry version 0.1.1

Python
uvx guardrails-mcp

Python
uvx guardrails-mcp==0.1.1

Setup by client

Pick your client — the config below is generated for this server (local stdio). Copy respects the “Pin version” switch above.

claude_desktop_config.json

{
  "mcpServers": {
    "guardrails-mcp": {
      "command": "uvx",
      "args": [
        "guardrails-mcp"
      ],
      "env": {
        "GUARDRAILS_DATA_DIR": "<YOUR_GUARDRAILS_DATA_DIR>"
      }
    }
  }
}

{
  "mcpServers": {
    "guardrails-mcp": {
      "command": "uvx",
      "args": [
        "guardrails-mcp==0.1.1"
      ],
      "env": {
        "GUARDRAILS_DATA_DIR": "<YOUR_GUARDRAILS_DATA_DIR>"
      }
    }
  }
}

Format verified against the official Claude Desktop docs ↗.

terminal

claude mcp add --env GUARDRAILS_DATA_DIR=<YOUR_GUARDRAILS_DATA_DIR> guardrails-mcp -- uvx guardrails-mcp

claude mcp add --env GUARDRAILS_DATA_DIR=<YOUR_GUARDRAILS_DATA_DIR> guardrails-mcp -- uvx guardrails-mcp==0.1.1

Format verified against the official Claude Code docs ↗.

.cursor/mcp.json

{
  "mcpServers": {
    "guardrails-mcp": {
      "command": "uvx",
      "args": [
        "guardrails-mcp"
      ],
      "env": {
        "GUARDRAILS_DATA_DIR": "<YOUR_GUARDRAILS_DATA_DIR>"
      }
    }
  }
}

{
  "mcpServers": {
    "guardrails-mcp": {
      "command": "uvx",
      "args": [
        "guardrails-mcp==0.1.1"
      ],
      "env": {
        "GUARDRAILS_DATA_DIR": "<YOUR_GUARDRAILS_DATA_DIR>"
      }
    }
  }
}

Format verified against the official Cursor docs ↗.

.vscode/mcp.json

{
  "servers": {
    "guardrails-mcp": {
      "command": "uvx",
      "args": [
        "guardrails-mcp"
      ],
      "env": {
        "GUARDRAILS_DATA_DIR": "<YOUR_GUARDRAILS_DATA_DIR>"
      }
    }
  }
}

{
  "servers": {
    "guardrails-mcp": {
      "command": "uvx",
      "args": [
        "guardrails-mcp==0.1.1"
      ],
      "env": {
        "GUARDRAILS_DATA_DIR": "<YOUR_GUARDRAILS_DATA_DIR>"
      }
    }
  }
}

Format verified against the official VS Code docs ↗.

mcp_config.json

{
  "mcpServers": {
    "guardrails-mcp": {
      "command": "uvx",
      "args": [
        "guardrails-mcp"
      ],
      "env": {
        "GUARDRAILS_DATA_DIR": "<YOUR_GUARDRAILS_DATA_DIR>"
      }
    }
  }
}

{
  "mcpServers": {
    "guardrails-mcp": {
      "command": "uvx",
      "args": [
        "guardrails-mcp==0.1.1"
      ],
      "env": {
        "GUARDRAILS_DATA_DIR": "<YOUR_GUARDRAILS_DATA_DIR>"
      }
    }
  }
}

Format verified against the official Windsurf docs ↗.

Environment variables

Defined in the server's official registry manifest. Required secrets are shown as <YOUR_…> placeholders in the configs above.

GUARDRAILS_DATA_DIR required — Absolute writable directory for local evaluation records. Use the same path in CLI and dashboard.

About this server

Distributed as Python, listed under Developer Tools. Review our MCP security guide before granting access to real data.

Frequently asked questions

How do I install GuardRails-MCP?

Run the install command shown above, then paste the config for your client (Claude Desktop, Claude Code, Cursor, VS Code or Windsurf) into its MCP settings and restart the client.

Is GuardRails-MCP free to use?

The MCP server itself is free to install. The source is public on https://github.com/TAM-DS/guardrails-mcp. Any third-party service it calls may require its own API key and account.

Which clients support GuardRails-MCP?

Any MCP-compatible client can use it, including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf and custom agents.

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