get_frontmost_app

Get the name, bundle identifier, and PID of the currently active (frontmost) application.

SERVERAirMCP SOURCEairmcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/heznpc-airmcp/get-frontmost-app.md

WHAT IT DOES

What get_frontmost_app does on AirMCP

AI agents call get_frontmost_app to retrieve information from AirMCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why get_frontmost_app is rated Low

This tool retrieves metadata about the active application window without modifying any system state, user data, or triggering external operations. It is a passive query operation that returns information only. While the information could theoretically be used to inform malicious behavior, the tool itself performs no harmful action and has minimal blast radius as a standalone capability.

From the tool's definition Tool description states it 'Get[s] the name, bundle identifier, and PID of the currently active (frontmost) application' — a pure read operation querying system state with no side effects or data modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_frontmost_app safely

PolicyLayer is an MCP gateway: it sits between your AI agents and AirMCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For get_frontmost_app, this is the rule to start with:

get_frontmost_app Allowed

get_frontmost_app is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_frontmost_app": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect AirMCP, apply this rule, and every get_frontmost_app call is checked against it from then on.

FAQ

Questions about get_frontmost_app

What does the get_frontmost_app tool do? +

Get the name, bundle identifier, and PID of the currently active (frontmost) application. It is categorised as a Read tool in the AirMCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_frontmost_app? +

Register the Air MCP server in PolicyLayer and add a rule for get_frontmost_app: 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 AirMCP. Nothing to install.

What risk level is get_frontmost_app? +

get_frontmost_app is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_frontmost_app? +

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

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

get_frontmost_app is provided by the Air MCP server (airmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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