set_navigation_destination · Smartcar MCP Server MCP

WHAT IT DOES

What set_navigation_destination does on Smartcar MCP Server

AI agents invoke set_navigation_destination to trigger actions in Smartcar MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why set_navigation_destination needs a policy

This tool sends a command to a real vehicle's navigation system, which constitutes an external operation with physical-world effects. It doesn't simply read data, nor does it irreversibly destroy or create data — it configures the vehicle's navigation state. This falls under Execute as it triggers an external operation whose effects depend on the arguments provided (the destination).

From the tool's definition 'Set a destination in the vehicle' — triggers an external operation on a physical vehicle's navigation system

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_navigation_destination Rate-limited

set_navigation_destination stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_navigation_destination": {
      "limits": [
        {
          "counter": "set_navigation_destination_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about set_navigation_destination

What does the set_navigation_destination tool do? +

Set a destination in the vehicle. It is categorised as a Execute tool in the Smartcar MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on set_navigation_destination? +

Register the Smartcar MCP Server MCP server in PolicyLayer and add a rule for set_navigation_destination: 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 Smartcar MCP Server. Nothing to install.

What risk level is set_navigation_destination? +

set_navigation_destination is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit set_navigation_destination? +

Yes. Add a rate_limit block to the set_navigation_destination 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 set_navigation_destination completely? +

Set action: deny in the PolicyLayer policy for set_navigation_destination. 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 set_navigation_destination? +

set_navigation_destination is provided by the Smartcar MCP Server MCP server (thachdosc/smartcar-mcp-test). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.