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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and a closed-world scope, so the safety profile is fully covered elsewhere. The description contributes only the shape of the returned data (tier ladder, page link), which is genuinely useful given there is no output schema, but says nothing about coverage breadth, ordering, or size.

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?

A single ten-word sentence with no filler, and the resource scope plus returned fields are front-loaded. It reads as a fragment without an explicit verb, but nothing is wasted and nothing is buried.

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?

For a parameterless read-only listing, the definition covers what the tool returns and the safety profile is fully carried by annotations. The only gap is that it never names the singular counterpart get_cruise_loyalty, which matters in a catalog with 50+ sibling 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?

The tool takes zero parameters, so there is nothing for the description to disambiguate and the baseline is 4. The description correctly implies the call is unfiltered and returns the full set.

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 names the resource precisely (every cruise line's loyalty program) and adds the payload contents (tier ladder and page link). The word 'Every' signals a bulk listing, which distinguishes it from the singular sibling get_cruise_loyalty, though that sibling is never named.

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?

Usage is only implied: 'Every ... loyalty program' suggests a list-all operation rather than a single lookup, which weakly routes an agent away from get_cruise_loyalty. There is no explicit when-to-use statement, no mention of alternatives such as compare_point_programs, and no conditions or prerequisites.

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