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hass-mcp

by TheWhykiki

ha_light_turn_off

Turn off a specific light in Home Assistant by providing its entity_id.

Instructions

Turn off a light by entity_id.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
entity_idYes
Behavior2/5

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

Minimal disclosure; implies state change but no details on side effects, permissions, or reversibility. No annotations to compensate.

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

Conciseness3/5

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

Single sentence with no fluff, but overly sparse. Conciseness is earned, but brevity loses essential details.

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

Completeness2/5

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

Insufficient for safe invocation; lacks information about expected entity format, error scenarios, and relationship to sibling tools.

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

Parameters2/5

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

Description mentions 'entity_id' but provides no format, examples, or constraints. With 0% schema description coverage, the description only partially compensates.

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

Purpose4/5

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

Clear verb+resource ('Turn off a light') and specifies identification method ('by entity_id'). Distinguishes from sibling 'ha_light_turn_on' but does not explicitly differentiate from area-level tools like 'ha_area_lights_off'.

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 on when to use vs alternatives (e.g., ha_area_lights_off for multiple lights). No prerequisites or exclusions stated.

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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