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

Annotations already declare readOnly, idempotent, non-destructive and openWorld, so safety is covered. The description adds useful behavior beyond that: the 16-day date ceiling and the 'meaningfully higher score' selection criterion. It still omits return format, pagination, and how radius defaults behave.

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?

A single dense sentence with the core scope front-loaded ('For a beach resort and date... nearby resorts with a meaningfully higher beach score'). It wastes nothing, though the colon-clause tail reads as slightly clipped.

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?

No output schema exists, so the description should carry return-value expectations; it gestures at the result (nearby higher-scoring resorts) but leaves 'meaningfully higher' undefined and says nothing about how many results or how radius affects them. Adequate but with clear gaps for a 3-param 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?

Schema coverage is only 33% (just the date format), so the description must compensate. It does add the 16-day constraint on date, but resort and radiusMiles receive no semantics in the schema or the description, and radiusMiles bounds (25-1000) go entirely unexplained.

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 names a concrete output (nearby resorts with a meaningfully higher beach score) for a given resort and date, so an agent can tell it apart from search_beach_resorts or rank_beaches. It does not explicitly name a sibling it is not, and 'swap suggestions' is slightly colloquial, but the resource and purpose are 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?

It gives a triggering scenario ('when sargassum or weather is bad') and the 16-day horizon, which is real usage context. However, it names no alternative tools (e.g. sargassum_forecast, beach_conditions) and gives no when-not guidance, so the routing is only implied.

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