simctl_set_location · Simctl MCP: Risk & Policy

WHAT IT DOES

What simctl_set_location does on Simctl

AI agents invoke simctl_set_location to trigger actions in Simctl. 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 simctl_set_location needs a policy

Based on the tool name, this likely sets a simulated GPS/location on an iOS Simulator device using xcrun simctl. Setting a simulator's location is an Execute-class action (triggers an external operation on the simulator). The description is empty, lowering confidence. Severity is medium as misuse could affect location-dependent app behavior during testing, but blast radius is limited to simulator environments.

From the tool's definition Tool name 'simctl_set_location' on a server providing 'xcrun simctl commands' for iOS Simulator management. Description is empty.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

simctl_set_location Rate-limited

simctl_set_location 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": {
    "simctl_set_location": {
      "limits": [
        {
          "counter": "simctl_set_location_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 Simctl, so you can run agents against it safely.

FAQ

Questions about simctl_set_location

What does the simctl_set_location tool do? +

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

How do I enforce a policy on simctl_set_location? +

Register the Simctl MCP server in PolicyLayer and add a rule for simctl_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 Simctl. Nothing to install.

What risk level is simctl_set_location? +

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

Can I rate-limit simctl_set_location? +

Yes. Add a rate_limit block to the simctl_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 simctl_set_location completely? +

Set action: deny in the PolicyLayer policy for simctl_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 simctl_set_location? +

simctl_set_location is provided by the Simctl MCP server (nzrsky/simctl-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.