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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description's added value is limited to confirming pagination and the mandatory marketplace/locale pairing; it says nothing about what a page contains, result ordering, or what an empty catalog looks like — relevant for an open-world tool whose inventory varies by storefront.

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?

Four short fragments, with the resource and the mandatory-parameter rule front-loaded. 'OpenAPI: getCatalog' is low-value metadata for an agent, but it costs almost nothing and nothing else is padded.

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 burden of explaining what a page returns, yet it only says 'gift starters'. For an 8-parameter, open-world catalog tool with two overlapping category filters, it leaves meaningful gaps an agent would need to guess around.

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 50%, so the description should compensate at least partially; it only reiterates that marketplace and locale are mandatory and that results are paginated. The genuinely ambiguous pair — single-value giftCategory enum vs comma-separated giftCategories string — is left completely unexplained, as are occasion and q interactions.

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 resource and scope: a paginated, curated catalog of new-mum gift starters. It also implicitly separates itself from the search tool via 'Search remains primary discovery'. The verb is implied rather than stated ('Paginated curated ... starters'), which keeps it just 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?

'Search remains primary discovery' explicitly routes the agent to search_gifts for lookups and positions this tool as the browse/curation path, and 'ALWAYS pass marketplace + locale' gives a hard invocation rule. It doesn't spell out an explicit when-not condition (e.g. empty query, no curation available), so it stops at 4.

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