Guardrail MCP

Deterministic preflight checks for credentials, fund transfers, writes, and prompt overrides.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "guardrail-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "guardrail-mcp"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

Guardrail MCP

Small, free, read-only Remote MCP for deterministic action preflight.

It exposes two tools:

get_guardrail_capabilities
assess_action_risk

The check detects a deliberately small set of high-risk patterns: credential exposure, fund movement, external writes, and instruction overrides. It does not execute an action, persist a request, authenticate a user, charge a payment, call AI, or fetch external URLs.

Local use

Terminal

npm run check
npm test
npm run dev

Endpoints: GET /, GET /health, and stateless Streamable HTTP POST /mcp.

Boundary

This is an informational deterministic preflight, not a safety guarantee or legal, financial, or security advice. Deployment and any public endpoint require separate approval.

Read the full README →View source on GitHub →

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Frequently Asked Questions about Guardrail MCP

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "guardrail-mcp": { "command": "npx", "args": ["-y", "Guardrail MCP"] } }

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Technical Specs & Signals

CategoryDeveloper Tools

29Quality signal: Emerging · 29/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership10/20

Documentation & tools11/30

Adoption & activity1/15

Community engagement0/10

A guidance signal from public completeness & health data — not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

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More in 💻 Developer Tools →Best MCP servers for Developers →Alternatives to Guardrail MCP →Install in Claude Desktop Install in Cursor Install in VS Code

Documentation Overview

Guardrail MCP

Small, free, read-only Remote MCP for deterministic action preflight.

It exposes two tools:

get_guardrail_capabilities
assess_action_risk

Local use

Terminal

npm run check
npm test
npm run dev

Endpoints: GET /, GET /health, and stateless Streamable HTTP POST /mcp.

Boundary

This is an informational deterministic preflight, not a safety guarantee or legal, financial, or security advice. Deployment and any public endpoint require separate approval.