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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so safety is covered structurally; the description still adds the auth context ('no sign-in') and, because there is no output schema, spends most of its text disclosing exactly what the response contains. It does not address failure modes (unknown city, missing guide) or any cost/latency characteristics.

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 routing guidance is front-loaded and the closing sentence cleanly closes the scope with the sibling handoff. The middle is one very long enumerated clause listing return contents; it is justified by the absent output schema but is heavy to parse in a single pass.

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?

With no output schema, the description compensates by specifying the return payload item by item, and with full schema coverage on four simple parameters nothing else is needed. An agent has enough to decide when to call it and what it will get back.

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 description coverage is 100%, so the schema already explains adults, checkin/checkout and the location slug including the area-to-destination behaviour. The description adds nothing about parameter semantics beyond what is structured, so the baseline 3 applies.

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 specific resource (destination/city overview) and enumerates its payload precisely: hotel count, average Comfort Score, median price, neighbourhoods with top hotels, travel styles, city tax, seasonality, and area guide. It explicitly distinguishes itself from search_hotels, so an agent can route without opening either schema.

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 states the deciding condition up front ('when the user is still choosing a destination or an area to stay in') and names the alternative with a concrete example: 'A request for hotels (e.g. quiet hotels in Bangkok) is search_hotels' job.' Both when-to-use and when-not-to-use are explicit.

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