get-isochrone

Get a reachability polygon showing everywhere reachable from a point within a given travel time.

SERVERRendezvous SOURCErendezvous-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade A, identity unverified Pull the record →

This record as markdown: /tools/dev-forgesworn-rendezvous-mcp/get-isochrone.md

WHAT IT DOES

What get-isochrone does on Rendezvous

AI agents call get-isochrone to retrieve information from Rendezvous without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why get-isochrone is rated Low

This tool queries routing/geographic data to compute and return an isochrone polygon. It retrieves information about travel time reachability from a location but does not create, modify, delete, or execute external operations. The output is informational only.

From the tool's definition Tool name and description indicate data retrieval: 'Get a reachability polygon showing everywhere reachable from a point within a given travel time.' The verb 'Get' and the function of retrieving/computing a geometric polygon based on routing parameters are…

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get-isochrone safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Rendezvous, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For get-isochrone, this is the rule to start with:

get-isochrone Allowed

get-isochrone is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get-isochrone": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Rendezvous, apply this rule, and every get-isochrone call is checked against it from then on.

FAQ

Questions about get-isochrone

What does the get-isochrone tool do? +

Get a reachability polygon showing everywhere reachable from a point within a given travel time. It is categorised as a Read tool in the Rendezvous MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get-isochrone? +

Register the Rendezvous MCP server in PolicyLayer and add a rule for get-isochrone: 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 Rendezvous. Nothing to install.

What risk level is get-isochrone? +

get-isochrone is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get-isochrone? +

Yes. Add a rate_limit block to the get-isochrone 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 get-isochrone completely? +

Set action: deny in the PolicyLayer policy for get-isochrone. 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 get-isochrone? +

get-isochrone is provided by the Rendezvous MCP server (rendezvous-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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