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

Annotations already declare readOnlyHint and openWorldHint, so safety is covered; the description adds that results are paginated, which annotations do not convey. However it says nothing about ordering, page size limits (capped at 100 in schema), or whether the curated set varies by marketplace/locale — useful context that is left out.

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 sentences, front-loaded with the resource and the mandatory-parameter rule; nothing is padded. The trailing "OpenAPI: getCatalog." is filler for an agent but negligible.

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 8 params, two overlapping category filters, and no output schema, the description should say what a catalog entry looks like and how occasion/category interact; it does not. The pagination mention partially compensates for the missing output schema but leaves an agent guessing on the filter semantics.

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?

At 50% schema coverage the description should carry weight for the undocumented params (q, limit, offset, occasion, giftCategory, giftCategories), but it only repeats that marketplace and locale are required, which the schema already states. It never clarifies the confusion between giftCategory (enum) and giftCategories (comma-separated string), which is the biggest semantic risk here.

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?

"Paginated curated teacher gift starters" names the resource and the result type (curated, paginated), and "Search remains primary discovery" implies the split from search_gifts. It lacks an explicit verb phrase (list/get/browse), but the resource and scope are specific enough to pick the tool over search_gifts.

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 positions this as a secondary, browse-style tool relative to search_gifts, which is real routing guidance. "ALWAYS pass marketplace + locale" gives a hard precondition. It stops short of stating exclusions (e.g. when not to bother with the catalog) but the context is clear.

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