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Guardrails MCP server

by ExpertVagabond·io.github.ExpertVagabond/guardrails·v1.0.1·1 stars
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AI Agent Guardrails MCP server - security layer

A92/100grade A
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Safety scan
A92/100

full report

Adoption
Growing

1 stars45 downloads/wk

Reviews

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Guardrails tools

No tool declarations could be read from the package source. They show once the server is installed.

Public scan report

scanner v0.1.10 · 2026-09-28 · same rubric, same numbers if you re-run it

no findings
  • Code scan7 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 21 days ago15/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 92/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Guardrails compares

Against every graded AI and agents MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
92/100
higher than 90% of 4,460 AI and agents servers
GitHub stars
1
more than 50% of 2,711 AI and agents servers
Downloads a week
45
more than 37% of 1,538 AI and agents servers with a package

Install Guardrails in Claude Code, Cursor or VS Code

Runs npx -y guardrails-mcp-server on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add guardrails -- npx -y guardrails-mcp-server
Add to Cursor

What the publisher says

From the Guardrails repository's README, as published. We do not edit it. Read it on GitHub

guardrails-mcp-server

\ \ \

MCP server for AI agent security guardrails. Provides input validation, prompt injection detection, PII redaction, output filtering, policy enforcement, rate limiting, and comprehensive audit logging.

Tools

Security Features

  • Prompt Injection Detection -- 12 regex patterns for jailbreak, DAN mode, system prompt override
  • PII Detection and Redaction -- SSN, credit card, email, phone, IP, API keys, AWS keys, JWT, passwords, private keys, connection strings
  • Malicious Code Blocking -- eval, exec, subprocess, child_process, shell injection
  • Policy Engine -- Block sensitive paths, dangerous tools, unauthenticated destructive ops, URL allowlist, maintenance windows
  • Rate Limiting -- Per-user sliding window (configurable requests/minute)
  • Audit Logging -- Timestamped events with metrics, log rotation, external handler support

Install

npm install

Configuration

{
  "mcpServers": {
    "guardrails": {
      "type": "stdio",
      "command": "node",
      "args": ["/path/to/guardrails-mcp-server/index.js"]
    }
  }
}

Project Structure

src/engine/GuardrailsEngine.js    # Core orchestration
src/validators/InputValidator.js   # Prompt injection and PII detection
src/filters/OutputFilter.js        # Redaction and harmful content blocking
src/policies/PolicyEngine.js       # RBAC, quotas, maintenance windows
src/audit/AuditLogger.js           # Event logging and metrics

License

MIT

Nothing above is checked by us. What we check is on the safety report.

Guardrails: common questions

Is Guardrails MCP server safe?
Yes, by our scan: it is graded A (92/100). Read the Guardrails safety report
How do I install Guardrails?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Guardrails need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Guardrails maintained?
The last commit was 57 days ago (2026-09-08). The latest release is v1.0.1.
What can I use instead of Guardrails?
Servers from other publishers that do the same job: Agent Security Scanner MCP server, agent-device MCP server and HOL Guard MCP server.
How does Guardrails compare with other AI and agents MCP servers?
safety score 92/100 (higher than 90% of 4,460 AI and agents servers); github stars 1 (more than 50% of 2,711 AI and agents servers); downloads a week 45 (more than 37% of 1,538 AI and agents servers with a package). Full comparison.

Alternatives to Guardrails

Same job from other publishers: the closest match first, then the best rated.

  • Agent Security Scanner
    Security layer for AI agents: blocks prompt injection, detects fake packages, scans vulnerabilities.
    C
  • agent-device
    Open source device layer for AI agents: control mobile, web, TV, and desktop apps over MCP
    A
  • HOL Guard
    Local-first AI agent security evidence and approval workflows through HOL Guard's stdio MCP server.
    A
  • Agent Recall
    Correction-first agent memory. Precision KPI tracks if agents heed warnings. 5 layers, local-only.
    A
  • Shellward
    AI agent security: 7 MCP tools for injection detection, PII scanning, command safety, DLP.
    A

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