AI agents call get_menu_bar_structure to retrieve information from Mac without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns structural information about a macOS application's menu bar. It is a purely informational read operation that does not create, modify, delete, or execute any actions. The blast radius of misuse is minimal as an agent could only gain knowledge of menu structure, which is typically visible to end users already.
From the tool's definition Tool name is 'get_menu_bar_structure' and description states it 'Gets the complete menu bar hierarchy' — a retrieval operation with no side effects. No modification, deletion, or execution is performed.
Attacks that exploit this kind of access
Gets the complete menu bar hierarchy for a process by PID. It is categorised as a Read tool in the Mac MCP Server, which means it retrieves data without modifying state.
Register the Mac MCP server in PolicyLayer and add a rule for get_menu_bar_structure: 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 Mac. Nothing to install.
get_menu_bar_structure 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 get_menu_bar_structure 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 get_menu_bar_structure. 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.
get_menu_bar_structure is provided by the Mac MCP server (laststance/mac-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
get_menu_bar_structure is one line of Mac's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →