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marcinn2

gree-ac-mcp-server

Set display light

set_light

Turn the front-panel display light of a GREE/EWPE compatible air conditioner on or off. Use this when lightControl is enabled in the device config.

Instructions

Turn the front-panel display light on/off. Only usable if lightControl is enabled in config.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
onYes
macNoDevice MAC (12 hex chars, the canonical identifier). Preferred selector.
nameNoDevice name from config, as a convenience alias for mac.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A4/5.0
Behavior4/5

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

With no annotations provided, the description carries the disclosure burden. It clearly states the state-changing effect (on/off) and a config prerequisite. It does not detail failure modes or persistence, but the core behavior is transparent.

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?

Two short sentences, with the primary action front-loaded and the prerequisite in the second. Every word earns its place; no redundancy or filler.

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 three-parameter toggle tool, the description covers the action and a key prerequisite. The schema already documents the mac/name selectors, so this is adequate; a note on behavior when lightControl is disabled would make it 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 coverage is 67% (mac and name have descriptions, on does not). The description's 'on/off' phrasing indirectly gives meaning to the undocumented `on` boolean, but it adds no direct parameter-level details beyond the schema.

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?

States a specific verb and object: 'Turn the front-panel display light on/off.' This clearly distinguishes it from sibling tools like set_power or set_mode, which control different device functions.

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?

Provides a clear precondition: 'Only usable if lightControl is enabled in config.' However, it does not explicitly mention alternatives or exclusions (e.g., use another tool when lightControl is disabled), leaving some selection reasoning to inference.

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