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matthewdcage

macOS Automation MCP Server

by matthewdcage

get_volume

Get the current system volume level on macOS. Use it to monitor or automate audio settings.

Instructions

Get the current system volume level.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

No annotations are present, so the description carries full responsibility for behavioral disclosure. It indicates a read operation ('get'), which implies non-destructive behavior, but does not explicitly state that there are no side effects, whether permissions are needed, or what happens on error. For a simple getter, this is minimally adequate but leaves gaps.

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 of eight words, 'Get the current system volume level.' It is perfectly concise, front-loaded, and contains no wasted words or redundant information.

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

Completeness4/5

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

For a zero-parameter getter with an output schema, the description is nearly complete. It clearly identifies the action and resource, and the output schema presumably covers the return format. A minor gap is the lack of any mention of volume scale or units, but that is not essential given the output schema and simplicity.

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

Parameters4/5

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

There are zero parameters, so the baseline is 4. The schema is empty, and the description does not need to explain any parameter details. The tool takes no input, so nothing is missing.

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 uses the specific verb 'get' and the resource 'system volume level', clearly distinguishing this read operation from sibling tools like set_volume and toggle_mute. It is unambiguous and exactly states what the tool does.

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

Usage Guidelines3/5

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

The description states that it retrieves the current volume level, which implies usage when a read of the volume is needed. However, it does not explicitly compare against set_volume, toggle_mute, or other alternatives, nor does it provide any 'when not to use' guidance. Usage is only implied by the name and the get verb.

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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