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

Annotations already establish that this is a read-only, closed-world operation. The description adds useful behavioral context by listing what is compared and the derived verdicts such as cheapest, biggest discount, newest, and largest, though it does not discuss error handling or limits beyond the 2–5 range.

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 action and input scope are front-loaded, followed by a dense but relevant list of comparison fields. It is appropriately sized for the amount of output context it conveys, though it is somewhat run-on.

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?

Given that an output schema exists and annotations cover safety, the description supplies enough context about inputs, valid count, source, and comparison outputs. Nothing essential for correct invocation appears to be 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 coverage is 100%, so the parameters are already documented. The description still adds meaning by specifying that inputs come from search_deals and by stating the effective range of 2–5 items, which is not encoded as a minimum in the schema.

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 states a specific verb and resource: comparing 2–5 discounted boat-weeks side by side. It clearly distinguishes this from broad search by saying to pass ids or page URLs from search_deals, and it enumerates the comparison dimensions.

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?

It gives clear usage context: compare 2–5 boat-weeks and pass ids or page URLs from search_deals. It does not explicitly name when to avoid this tool versus siblings like get_boat, but the intended workflow and input source are clear.

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