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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds that reviews are 'normalized' and that limit defaults to 10, but says nothing about pagination totals, ordering, or empty-result behavior, so it contributes only modest context beyond the structured fields.

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?

Front-loads the purpose, then the id source, then pagination, then the sibling routing note in a compact block. Efficient, though the product_id/limit restatement duplicates schema text rather than earning its place.

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, return values need not be described, and the description covers purpose, id provenance, pagination default, and the hotel-vs-attraction disambiguation. Nothing an agent needs to invoke it correctly is missing.

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 all three parameters are already documented. The description restates the product_id sourcing and the limit range/default almost verbatim from the schema, adding no meaning beyond it; 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?

States a specific verb and resource ('Returns normalized guest reviews for a Booking.com attraction') and explicitly scopes it to attractions, distinguishing it from the hotel counterpart in the same sentence. An agent can tell it apart from booking_reviews and booking_attractions_search without opening any schema.

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?

Names the alternative explicitly ('Use booking_reviews to retrieve booking.com hotel reviews') and hints at the prerequisite chain via 'from a prior AttractionSearch call'. Clear routing context, though it does not explicitly state when to prefer this over booking_attractions_detail or how it relates to the search step beyond the id source.

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