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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is fully covered. The description adds purpose context (grounding, spelling) but says nothing about pagination behavior, result limits, or what happens when a query matches nothing. That is adequate but not rich given the annotations carry the safety burden.

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 sentences, zero filler, and the core purpose is front-loaded before the parameter guidance. Every clause earns its place.

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 an output schema present, return values need no explanation, and the description covers the tool's purpose and its two semantically meaningful parameters. Pagination semantics for page/limit are the only notable gap for an otherwise simple lookup tool.

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 0%, so the description must compensate. It does supply the key domain values for 'kind' (brand or designer) that the schema lacks as an enum, and notes that 'query' is optional. It says nothing about 'page' or 'limit', leaving half the parameters to inference, so it only partially compensates.

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?

States a specific verb and resource: 'Look up Whoppah's brand and designer index.' An agent immediately knows this returns brand/designer entities rather than items or sellers. It does not name or contrast with any sibling tool, so it falls short of 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?

Gives concrete reasons to use it: spell names correctly, ground answers, build precise search filters. This is clear context for when the tool is appropriate. However, no when-not guidance or explicit alternative (e.g., list_categories or search_catalog) is offered.

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