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nemanjavlahovic

InstrumentsMCP

sim_terminate_app

Terminate a running app on an iOS simulator by specifying its bundle identifier. Optionally target a specific device.

Instructions

Terminate a running app on a simulator.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
bundle_idYesApp bundle identifier
deviceNoDevice UDID, name, or 'booted'booted
Behavior2/5

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

No annotations are provided, so the description bears full burden. It only states the action without disclosing behavioral traits such as whether the simulator must be booted, what happens if the app is not running, or potential side effects. The description is insufficient for a mutation tool.

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

Conciseness3/5

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

The description is a single sentence with no waste, but it is too minimal. It earns its place but could incorporate additional context without losing 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?

Given the tool's simplicity (2 parameters, no output schema), the description is reasonably complete. However, it lacks information on return values or error handling, which would be helpful for an agent.

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% for both parameters (bundle_id, device with default). The description adds no extra meaning beyond the schema. Baseline of 3 is appropriate as the schema already documents the parameters.

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 'Terminate a running app on a simulator' clearly states the verb 'Terminate' and the resource 'app on simulator'. It is specific enough, though it could be improved by distinguishing from sibling tools like sim_launch_app. It is not a tautology and provides a clear purpose.

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?

The description provides no guidance on when to use this tool versus alternatives such as sim_launch_app or sim_open_url. There is no mention of prerequisites or context where this tool is appropriate.

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

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