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print_service

Inspect detailed launchd target state for system or user services to diagnose configuration and runtime issues.

Instructions

Print detailed state for a launchd target via launchctl print.

Args: target: A launchd target, e.g. "system/com.apple.cfprefsd.xpc.daemon" or "gui/501/com.example.app".

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
targetYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A4/5.0
Behavior3/5

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

No annotations are provided, so the description carries the full burden. It reveals the operation is a print through launchctl, implying a read-only action, but it does not explicitly state the absence of side effects, required permissions, or failure behavior for nonexistent targets.

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 short and well-structured: the first sentence states the tool's purpose, and the Args block provides parameter detail with examples. No filler, and the key information is front-loaded.

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 simple single-parameter, read-only diagnostic tool with an output schema, the description provides the essential call details: what it does and the target format. Minor gaps such as explicit usage guidance or side-effect disclosure do not prevent correct invocation.

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?

Schema coverage is 0%, so the description must document the parameter. It does so meaningfully by defining 'target' as a launchd target and providing concrete examples in both system and gui forms, adding value beyond the raw string type.

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 clearly states a specific verb and resource: 'Print detailed state for a launchd target' and identifies the underlying command 'launchctl print'. This distinguishes it from sibling tools that list or modify services.

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 implies this tool is for inspecting detailed state of a specific launchd target, but it does not explicitly state when to use it over list_services or other siblings, nor any exclusions. This is left to inference.

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