Calculate travel distance and time for multiple origins and destinations
AI agents call maps_distance_matrix to retrieve information from Server Puppeteer without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves distance and travel time information between locations. It is a read/query operation with no side effects — it computes and returns data without modifying any state. Severity is low as misuse only results in excess API calls or data retrieval.
From the tool's definition Calculate travel distance and time for multiple origins and destinations
Attacks that exploit this kind of access
Calculate travel distance and time for multiple origins and destinations. It is categorised as a Read tool in the Server Puppeteer MCP Server, which means it retrieves data without modifying state.
Register the Server Puppeteer MCP server in PolicyLayer and add a rule for maps_distance_matrix: 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 Server Puppeteer. Nothing to install.
maps_distance_matrix 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 maps_distance_matrix 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 maps_distance_matrix. 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.
maps_distance_matrix is provided by the Server Puppeteer MCP server (@hisma/server-puppeteer). 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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