book_hotel · Hopper MCP Server MCP: Risk & Policy

WHAT IT DOES

What book_hotel does on Hopper MCP Server

AI agents use book_hotel to commit financial operations through Hopper MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.

WHY IT NEEDS A POLICY

Why book_hotel needs a policy

This tool commits a financial transaction by initiating a hotel booking that requires payment information. It directly moves money or commits financial obligations on behalf of the user, making it Financial category with critical severity due to the potential for significant unintended charges if misused by an AI agent.

From the tool's definition 'Initiate a hotel booking on Hopper. Requires guest details and payment information.'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

book_hotel Approval-gated

Any call to book_hotel is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "book_hotel": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Hopper MCP Server, so you can run agents against it safely.

FAQ

Questions about book_hotel

What does the book_hotel tool do? +

Initiate a hotel booking on Hopper. Requires guest details and payment information. Hopper. It is categorised as a Financial tool in the Hopper MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on book_hotel? +

Register the Hopper MCP Server MCP server in PolicyLayer and add a rule for book_hotel: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Hopper MCP Server. Nothing to install.

What risk level is book_hotel? +

book_hotel is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit book_hotel? +

Yes. Add a rate_limit block to the book_hotel rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block book_hotel completely? +

Set action: deny in the PolicyLayer policy for book_hotel. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides book_hotel? +

book_hotel is provided by the Hopper MCP Server MCP server (markswendsen-code/mcp-hopper). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.