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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, covering the safety profile. The description adds that the values are 'valid' for the destination and names the three families, but does not disclose additional behavioral details such as behavior for unknown destinations or whether results are exhaustive. This meets the minimum bar for a read-only tool.

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 entire description is a single front-loaded sentence with no filler. It states the action, the scope, and the result clearly and efficiently.

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?

This is a low-complexity, read-only list tool with complete parameter descriptions, an output schema, and annotations covering safety. The only notable gap is the lack of explicit distinction from the sibling facet_vocabulary, which could affect tool selection but not the correctness of a call once selected.

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%, and both parameters already have meaningful descriptions: destination explains how to find one, and kind explains filtering and omission. The description's mention of 'area, category and tag' reinforces the enum but adds no parameter meaning beyond the schema, so baseline 3 is appropriate.

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 uses a specific verb ('List') and clearly identifies the resource: a named destination's valid area, category, and tag filter values. This specificity distinguishes it from the content-oriented sibling tools like destination_guide or destination_events, even though it does not explicitly contrast with facet_vocabulary.

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?

The description implies the tool should be used when you have a named destination and need its valid filter values, and the destination parameter points the agent to search_destinations to discover one. However, it gives no explicit when-to-use versus alternatives such as facet_vocabulary, leaving some selection guidance to inference.

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