get_entities_by_area

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

With no annotations, the description bears full responsibility for behavioral disclosure. It covers case-insensitive lookup, device-based area inheritance, and the lean parameter's effect on output verbosity. The description of the return structure is also provided, offering good transparency overall.

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 well-structured with Args and Returns sections and examples, making it easy to scan. While it is slightly verbose for a simple tool, its organization earns a high score; a minor trim could improve conciseness.

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 presence of an output schema (implied by the Returns section), the description is complete. It explains all three parameters, the return structure, and edge cases like inheritance. For a tool of this complexity, no critical information is missing.

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 schema has 0% description coverage, meaning the description must fully explain parameters. It does so effectively: area is defined, domain is described as an optional filter, lean is explained as a token-efficiency option, and examples illustrate usage. This adds crucial meaning beyond the bare schema.

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 the tool's purpose: 'Get all entities assigned to a specific Home Assistant area (room).' This is a specific verb+resource combination that distinguishes it from sibling tools like list_entities or domain_summary_tool, which operate at different granularities.

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 helpful context on when to use the tool, including case-insensitive matching and area inheritance behavior. However, it does not explicitly mention when not to use it or suggest alternative tools for broader queries, leaving room for improvement.

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