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

With no annotations, the description carries the full burden and only reveals that it returns a bathroom count and costs 5 cents. It does not disclose what happens if no listing matches, how 'latest' is determined, or any prerequisites for gnaf_id.

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 two short sentences with the result front-loaded and the cost clearly separated. There is no filler, though the brevity sacrifices behavioral detail.

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?

Despite low complexity and an output schema, the description omits the parameter's meaning and the tool's selection semantics. An agent cannot confidently call this without knowing what gnaf_id should contain or what 'latest matching listing' means.

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 provides only a required string parameter with 0% description coverage, and the description never explains gnaf_id. An agent must guess that gnaf_id is a G-NAF identifier and how it relates to the matching listing.

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 states the resource ('bathroom count') and source ('latest matching listing'), so an agent can distinguish it from properties_basics_bed_count and properties_basics_parking_count. It lacks an explicit verb and 'matching' is imprecise, but the core purpose is clear.

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?

No guidance is given about when to use this tool versus properties_basics_all or other properties_basics_* siblings, and no alternatives are named. The phrase 'latest matching listing' implies a use case, but the description never says when this tool is preferred.

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