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

Beyond the annotations, it discloses useful behavioral details: result ranking rules, the item fields returned (price, rating, review count, duration), and a tracked book link. This adds operational expectations without contradicting the readOnly/idempotent annotations.

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?

Three sentences with no filler. Scope and read-only nature are front-loaded, followed by result contents and ranking behavior. Every sentence contributes useful information.

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 a full output schema, complete annotations, and 100% schema coverage for parameters, the description's added detail about result fields and ranking makes the tool's behavior clear enough for correct invocation. No critical missing context remains.

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 baseline is 3. The description adds some value by explaining that query affects ranking, but it does not add meaning beyond what the schema already provides for the individual parameters.

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 clearly identifies the resource as bookable experiences — wine tours, tastings, cellar visits, and tickets — scoped to a region, and adds that it is read-only. It lacks an explicit verb like 'returns' or 'lists' and does not name sibling tools, but the category is specific and unambiguous.

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 gives functional usage context, such as ranking by query relevance when a query is provided and by popularity otherwise, and the resource list implies when to use it. It does not explicitly state when to prefer an alternative sibling tool or when not to use this tool.

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