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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It mentions 'No fees' but does not disclose whether this is a read-only operation, what the output format is (e.g., links vs. HTML), what happens if no parameters are provided, or any side effects like opening an external booking engine. This is a significant transparency gap.

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 description is front-loaded with the main purpose and is reasonably concise. The list of cruise lines is a bit lengthy but informative. The 'No fees' statement is brief. Overall, every sentence serves a purpose, though the cruise line list could be compressed.

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 3 optional parameters, no output schema, and no annotations, the description must provide rich context. It covers purpose and some usage alternatives but omits the return format, behavior with no parameters, and parameter semantics for two of the three fields. This leaves the agent under-informed for a tool with these gaps.

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 only 33% (only cruise_line has a description). The description lists supported cruise lines and alternatives but does not explain the destination or departure_month parameters, nor clarify that all parameters are optional or how they affect results. It fails to compensate for the low schema coverage.

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 states the tool's function: 'Get cruise booking links for Pixie Vacations' online engine.' It lists supported cruise lines and distinguishes itself from sibling tools by explicitly naming search_virgin_voyages and get_river_cruise_info as alternatives for specific cases.

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 explicitly advises when not to use this tool: 'For Virgin Voyages or river cruises specifically, prefer the dedicated tools search_virgin_voyages or get_river_cruise_info — they return more detailed ship/itinerary info.' This provides clear exclusions and alternatives, though it does not explicitly state the general 'when to use' scenario beyond covering multiple lines.

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