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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered without the description. The description's only added behavioral value is the return shape ('both pages' links'); it says nothing about ordering, pagination beyond the limit param, or behavior when both grantor and grantee are supplied.

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 zero filler: the resource shape is front-loaded and the filter axes follow. Every clause carries information.

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 three-parameter, no-required-arg list tool with no output schema, the description gives enough: what a grant is, what comes back, and how to narrow it. Only the absence of return-ordering/pagination and sibling routing keeps it from a 5.

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 limit, grantee and grantor are already documented with their slug semantics and the 1-500 bound. The description merely paraphrases those filters and adds no new meaning, such as whether the two filters AND together or how slugs are resolved.

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 a concrete resource in relational form — 'holding card X unlocks lounge program Y' — plus the payload ('both pages' links'), so an agent knows exactly what rows come back. It does not, however, contrast itself with plausible siblings such as search_lounges, get_lounge, or check_access, which would have made it a 5.

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 second sentence tells the agent the two filter axes (granting card vs unlocked lounge program), which implies the retrieval use case. There is no explicit when-to-use/when-not-to-use guidance and no mention of which sibling to pick when the agent wants a lounge's details rather than the card-to-program relationship.

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