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simulator_shutdown

Shut down a specific iOS simulator or all running simulators at once to free system resources and prepare for fresh testing.

Instructions

Shutdown a simulator or all simulators

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
deviceIdNoSimulator UDID or "all" (default: "all")
Behavior2/5

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

With no annotations, the description bears full responsibility for behavioral disclosure. It only states the action ('shutdown') without explaining side effects (e.g., whether state is saved, if running apps are terminated, or if the simulator can be rebooted later). The agent is left guessing about the tool's consequences.

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

Conciseness5/5

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

The description is a single sentence with no wasted words. It is front-loaded and efficient, earning its place.

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?

For a simple tool with one optional parameter and no output schema, the description is adequate but not exemplary. It lacks details about return value, success indicators, or error cases. Given the low complexity, a 3 is reasonable.

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% (1 parameter with full description). The description adds no new meaning beyond the schema, which already states 'Simulator UDID or "all" (default: "all")'. Baseline 3 is appropriate as the schema does the heavy lifting.

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

Purpose5/5

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

The description specifies a clear verb ('Shutdown') and resource ('simulator or all simulators'), distinguishing it from siblings like simulator_boot, simulator_delete, and simulator_erase. It is unambiguous and unique among the sibling tools.

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?

No guidance is provided on when to use this tool vs alternatives such as simulator_erase or simulator_delete. There is no mention of prerequisites, warnings (e.g., data loss), or scenarios where shutdown is appropriate versus other actions.

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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