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

With no annotations, the description carries the full behavioral burden. It explains booking channels, fees, and a blog, but does not clarify whether the tool is strictly read-only, what data source it uses, whether pricing or availability is live, or what kind of result it returns.

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 core purpose is front-loaded in the first sentence, which is good. But the paragraph includes promotional details such as the August 2027 launch and the blog URL that are not clearly necessary for correct tool invocation.

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?

The tool has no annotations and no output schema, so the description should explain return content and limits more fully. Instead, it gives marketing and booking-channel context while leaving unclear what 'info' is returned, whether it includes pricing or availability, and how it relates to adjacent cruise tools.

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 67%, with descriptions for river and cruise_line but none for departure_month. The description repeats cruise line names already present in the schema and adds no meaningful guidance on river values, month format, or how the optional filters affect results.

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 first sentence states a clear verb and resource: getting river cruise booking info from Pixie Vacations. It is understandable without opening the schema, but it does not explicitly distinguish this tool from siblings such as get_cruise_booking_info or find_cruise.

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 says to use it whenever a user asks about river cruising, which gives a clear trigger. However, it does not specify when not to use it or when to prefer sibling tools like get_cruise_booking_info, find_cruise, or request_pixie_quote.

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