get_entities_by_area

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

No annotations are provided, so the description fully carries the burden of behavioral disclosure. It explains area resolution behavior (inheritance from parent device), case-insensitivity, and the lean parameter effect. The return structure is also described, providing good transparency.

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

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

The description is mostly concise and front-loaded with the main purpose. It includes structured parameter explanations and examples, which are helpful but add length. Could be slightly tighter, but overall well-organized.

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

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

Given the tool has 3 parameters, no annotations, and an output schema, the description covers all necessary aspects: area matching behavior, optional filtering, return dictionary structure, and usage examples. It is complete for an agent to correctly invoke the tool.

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

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

The input schema has 0% description coverage, but the description explains all three parameters: area (mandatory, case-insensitive), domain (optional filter), and lean (default true, token-efficient). This adds significant meaning beyond the schema types and defaults.

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

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

The description clearly states it gets all entities assigned to a specific Home Assistant area (room). It specifies the verb 'get', the resource 'entities by area', and distinguishes from siblings like 'list_entities' and 'search_entities_tool' by focusing on area-based filtering.

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

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

The description provides clear usage context with examples and explains the case-insensitive area lookup. It implicitly tells when to use this tool (filter by area) but does not explicitly mention when not to use it or suggest alternatives like search_entities_tool for name-based search.

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