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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds real value beyond them: the sort order (relevance to query, else popularity) and the fields each item carries including a tracked book link, which is non-obvious behavior.

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 tight sentences, front-loaded with what the tool returns and followed by the safety and ranking notes. No filler and every sentence carries information an agent needs.

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 an output schema present, the description need not detail return values, yet it summarizes them anyway alongside ranking behavior. Missing only pagination/limit behavior detail for a 5-param, list-returning tool.

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 city, limit, query, country and food_only are already documented in the schema. The description only reinforces query-based ranking and adds no syntax or default nuance beyond it, 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?

States a specific verb-resource pair with concrete scope: bookable wine tours, tastings, cellar visits and tickets for a region. It is clearly distinguishable from stays, car_hire and place, though it never names a sibling or an explicit boundary against generic search_places.

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 'region/city' framing implies when this tool fits, and the ranking note gives some invocation context, but there is no explicit when-to-use versus alternatives and no stated exclusions. It also never says to reach for search_places for non-bookable results.

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