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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds real value beyond that by disclosing the analytic outputs (six-month history, average, percent deviation, verdict, price-drop membership), which matters since no output schema exists.

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?

Two tight sentences with the payload front-loaded and zero filler; the prerequisite sentence follows the outcome sentence logically.

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, the description carries the return-value burden and does so by enumerating the five things the agent gets back. Combined with annotations covering safety and 100% schema coverage on inputs, nothing material is missing for correct invocation.

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 both parameters (id and cabin) are already documented, including the cabin enum and the id format example. The description only adds provenance for the id ("from searchCruises") and says nothing about the cabin filter, so 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?

Specific verb (judge) and resource (one sailing's current fare), with an enumeration of exactly what the tool returns. It explicitly scopes to a single sailing, which cleanly separates it from sibling getPriceDrops (a list) and compareSailings (multi-sailing comparison).

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 names the source of the required id ("from searchCruises"), which establishes the intended call order and prerequisites. It gives clear context but stops short of naming an explicit alternative or a when-not-to-use condition, e.g. against compareSailings.

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