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bidouilles

Mobile Pilot MCP

by bidouilles

terminate_app

Terminate a running iOS app on a simulator by specifying its device UDID and app bundle ID.

Instructions

Terminate an application.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
bundle_idYesApp bundle ID
device_idYesSimulator UDID

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

C2.9/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. It conveys only the bare effect (a running app is stopped) and says nothing about whether termination is graceful or forced, whether unsaved state is lost, what happens if the app is not running, or what errors can occur.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

A single short sentence that is front-loaded and wastes no words. It is appropriately terse, though the brevity edges toward under-specification rather than optimal conciseness.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The output schema means return values need not be explained, and both parameters are fully documented, so the core call mechanics are covered. However, for a state-changing action tool with many siblings and zero annotations, the absence of any usage or behavioral context leaves the definition only minimally complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so both required parameters (bundle_id, device_id) are already documented in the schema. The description adds no extra meaning about parameter format or constraints, which is the expected baseline when the schema does the heavy lifting.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description names a specific verb ('Terminate') and resource ('application'), making the action unambiguous. It does not, however, differentiate itself from sibling tools such as launch_app or list_apps, so the agent must infer the contrast from the name alone.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance on when to use this tool versus alternatives like launch_app, nor any stated preconditions (e.g., the app must already be running, the simulator must be booted). The agent gets no routing or exclusion information.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.