AI agents use create_reservation to commit financial operations through Mcp Hertz — usually the final step of a payment, billing, or trading workflow. A call moves real money.
Creating a car rental reservation commits a financial obligation — it books a vehicle at a price, potentially requiring a credit card hold or payment. This falls squarely in the Financial category as it initiates a billable contract with Hertz. Misuse by an AI agent could result in unauthorized financial commitments on behalf of the user.
From the tool's definition Create a new Hertz car rental reservation... Requires vehicle selection, location details, dates, and driver information.
Attacks that exploit this kind of access
Create a new Hertz car rental reservation. Requires vehicle selection, location details, dates, and driver information. It is categorised as a Financial tool in the Mcp Hertz MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Mcp Hertz MCP server in PolicyLayer and add a rule for create_reservation: 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 Mcp Hertz. Nothing to install.
create_reservation is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the create_reservation 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.
Set action: deny in the PolicyLayer policy for create_reservation. 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.
create_reservation is provided by the Mcp Hertz MCP server (markswendsen-code/mcp-hertz). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →