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surendranb

macOS Companion MCP Server

by surendranb

restart_service

Restart a macOS launchd service by specifying its service name. Uses launchctl to stop and start the service immediately.

Instructions

Restarts a macOS launchd service using launchctl

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
serviceYesService name (e.g. com.cloudflare.cloudflared)
Behavior2/5

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

No annotations are provided, so the description bears full responsibility for disclosing behavioral traits. It does not mention potential side effects (e.g., service interruption), required permissions, or failure modes, which are important for a mutating action like restarting a service.

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, compact sentence that front-loads the action and resource. Every word contributes meaning, with no redundant or filler content.

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 tool has a simple signature with one well-documented parameter, and the description conveys the core operation. However, because the tool mutates system state and there is no output schema or annotation, the lack of behavioral and usage context leaves the description minimally viable rather than fully 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%, with the 'service' parameter already documented as a service name with an example. The description adds no additional semantic detail beyond identifying the target as a launchd service, which is already implied by the tool's purpose.

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 a specific verb ('Restarts') with a clear resource ('macOS launchd service') and specifies the method ('using launchctl'). It clearly distinguishes this tool from sibling tools, none of which target launchd services.

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 given on when to use this tool versus alternatives, nor any prerequisites or exclusions. The description only states what the tool does, leaving the agent to infer appropriate usage situations.

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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