AI agents call simctl_list_devices to retrieve information from Simctl without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays information about existing iOS simulators without modifying, deleting, or executing operations on them. It is purely informational, making it a Read operation with low severity since exposing simulator inventory poses minimal risk.
From the tool's definition Tool name includes 'list' and description states 'List available iOS simulators and their states' - a query operation with no side effects.
Attacks that exploit this kind of access
List available iOS simulators and their states. It is categorised as a Read tool in the Simctl MCP Server, which means it retrieves data without modifying state.
Register the Simctl MCP server in PolicyLayer and add a rule for simctl_list_devices: 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.
simctl_list_devices 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 simctl_list_devices 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 simctl_list_devices. 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.
simctl_list_devices 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.
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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