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Guardrail MCP Server

answering

Guardrail MCP is answering right now. Last checked 9 min ago. It exposes 2 tools. Last commit 3 Sep 2026.

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

Uptime history 13 days of history
13 days agonow
100.0%
Uptime 24h
92 of 92 checks
2
Tools
read from the server
77 ms
Response time
average over 24h
0
Stars
last commit 3 Sep 2026

Nothing serious here today

Today is the operative word: we check Guardrail MCP every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 9 min ago.

run in your terminal
claude mcp add guardrail-mcp --transport http https://guardrail-mcp.kadopi.workers.dev/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "guardrail-mcp": {
      "url": "https://guardrail-mcp.kadopi.workers.dev/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.guardrail-mcp]
url = "https://guardrail-mcp.kadopi.workers.dev/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "guardrail-mcp": {
      "url": "https://guardrail-mcp.kadopi.workers.dev/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "guardrail-mcp": {
      "url": "https://guardrail-mcp.kadopi.workers.dev/mcp"
    }
  }
}

Available tools 2

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

assess
assess_action_risk
Runs a deterministic, read-only preflight check. It never executes the proposed action.
guardrail
get_guardrail_capabilities
Returns the scope and safety boundary of this free, deterministic preflight checker.

Endpoints

URLTransportStateLatencyChecked
https://guardrail-mcp.kadopi.workers.dev/mcp streamable-http answering 60 ms 9 min ago

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Guardrail MCP — questions

Answers built from our own checks of this server.

What can Guardrail MCP do?
It exposes 2 tools, read directly from the server on our last check. Among them: assess_action_risk, get_guardrail_capabilities. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Guardrail MCP working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 77 ms. The bar chart above shows every period we have measured.
How do I connect Guardrail MCP?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Guardrail MCP need an API key?
No. Guardrail MCP completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 2 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Guardrail MCP?
It answers our handshake in 77 ms on average, which is faster than 85% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is Guardrail MCP open source?
We cannot say either way: written in TypeScript and 0 stars on GitHub, but we could not determine the licence, and without one the code is not open source by default.