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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is fully covered. The description's 'API v3, read only' merely restates the readOnlyHint and adds no new behavioral context (no return shape, no pagination, no caching). Adequate but adds little beyond structured data.

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?

Two short sentences with the resource and the comparison axes front-loaded; no filler. The trailing 'API v3, read only' is largely redundant with the annotations, which keeps it from a 5.

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 usefully enumerates what the comparison covers (location, season, ages, character, opening periods), which gives the agent a reasonable expectation of the response. For a zero-required-parameter, read-only tool this is close to complete, though it could note the format of the side-by-side result.

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?

There is a single optional 'lang' parameter with 100% schema coverage and an inline enum description including the default. The description adds nothing about language behavior, which is acceptable given the schema carries it entirely.

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 the specific resource (the five Corissia Resorts hotels in Crete) and the exact comparison dimensions: location, season, ages, character and opening periods. An agent can tell it is a comparative, all-hotels-in-one response rather than a single-hotel lookup. It does not explicitly name sibling tools such as get_hotel_facts, so it falls short of full sibling differentiation.

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?

Usage is only implied by the phrase 'side by side' and 'the five hotels' – an agent can infer this is for whole-portfolio comparison versus per-hotel detail. There is no explicit when-to-use, when-not, or pointer to get_hotel_facts for granular lookups.

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