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

No annotations exist, so the description carries full burden. It discloses the output shape (deep links into the booking engine) and a commercial trait ('no fees'), implying a read-only search, but it never states auth requirements, whether prices are live or cached, or how many results come back.

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 short sentences, front-loaded with the filter set and return value, then the use case, then the exclusions. No filler and nothing redundant.

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 and no annotations, the description does the necessary work by explaining the return value and the when-to-use boundary. The notable gap is that all six parameters are optional, and the description never says what happens with no filters or which filters actually narrow results.

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 coverage is only 33%, so the description should compensate, and it partially does: it maps 'party size' to passengers and 'total budget' to max_total_budget with the whole-party framing. It says nothing about cruise_line or destination, and gives no month format, leaving two parameters undocumented in both places.

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 ('find a cruise') plus the four filter dimensions and what it returns (deep links into the booking engine). It also names the siblings it is not — search_virgin_voyages and get_river_cruise_info — so an agent can route without opening another 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?

Gives a concrete use-case template ('family cruise from Florida under $X') and explicit exclusions with named alternatives for Virgin Voyages and river cruises. It does not address the other plausible rivals in the sibling list (get_cruise_booking_info, request_pixie_quote), so routing to those is still inferred.

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