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

readOnlyHint=true already establishes the safety profile, so the bar is lower, and the description earns credit by disclosing the shape of what comes back (key_facts, areas with suitability/parking/distances, articles, FAQ, and per-fact source URLs). It still omits error behavior for an unknown slug and any auth expectations, keeping it short of the top mark.

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?

It is a single front-loaded sentence that leads with the resource and then enumerates contents, with no filler or redundancy. The enumeration is long, but because there is no output schema it is doing real work rather than padding.

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 effectively substitutes for one by cataloguing the returned sections and noting each fact carries a source URL. The main remaining gap is failure handling for an invalid slug, which is not covered anywhere.

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?

With a single parameter and 100% schema coverage, the schema already documents slug fully, including its source tool and an example. The description adds nothing about the parameter, 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 makes clear this retrieves a single destination guide's content and enumerates what that content comprises (key facts, areas to stay, articles, FAQ, sources), so the verb+resource is unambiguous. It does not, however, position itself against the obvious sibling list_destinations, which is only referenced inside the schema rather than the description.

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?

There is no explicit when-to-use or when-not-to-use guidance; the only routing hint (the slug comes from list_destinations) lives in the input schema, not the description. An agent must infer that this is the drill-down call after list_destinations, with no stated prerequisite or alternative.

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