set_location · React Native MCP: Risk & Policy

WHAT IT DOES

What set_location does on React Native

AI agents use set_location to create or update resources in React Native — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your React Native environment.

WHY IT NEEDS A POLICY

Why set_location needs a policy

This tool modifies the simulated GPS/location state of a mobile emulator or simulator. It creates/updates a configuration value (location) in a controlled test environment. It is reversible (location can be changed again), has no real-world financial or destructive impact, and only affects a local emulator/simulator environment, making severity low.

From the tool's definition Set GPS on iOS simulator or Android emulator

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_location Rate-limited

set_location stays usable, but capped — an agent stuck in a loop can't make hundreds of changes 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_location": {
      "limits": [
        {
          "counter": "set_location_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about set_location

What does the set_location tool do? +

Set GPS on iOS simulator or Android emulator. Android: emulator only. It is categorised as a Write tool in the React Native MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_location? +

Register the React Native MCP server in PolicyLayer and add a rule for set_location: 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 React Native. Nothing to install.

What risk level is set_location? +

set_location is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit set_location? +

Yes. Add a rate_limit block to the set_location 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_location completely? +

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

set_location is provided by the React Native MCP server (@ohah/react-native-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.