AI agents call get_rental_policies to retrieve information from Mcp Hertz without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool merely queries and returns existing policy information from the Hertz website. There are no state changes, no deletions, no code execution, and no financial transactions. It is a pure read operation similar to a search or fetch, placing it squarely in the Read category with low severity.
From the tool's definition The tool description states it 'Retrieve[s] Hertz rental policies' — a data retrieval operation with no modifications.
Attacks that exploit this kind of access
Retrieve Hertz rental policies including age requirements, fuel policy, insurance options, cancellation terms, and available extras. It is categorised as a Read tool in the Mcp Hertz MCP Server, which means it retrieves data without modifying state.
Register the Mcp Hertz MCP server in PolicyLayer and add a rule for get_rental_policies: 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.
get_rental_policies is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_rental_policies 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 get_rental_policies. 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.
get_rental_policies 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.
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