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

Annotations already establish read-only, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds genuinely useful context beyond that: cursor continuation derived from the previous response's next value, limit default 50, cap 5000, and a lower cap of 10 on the free plan — a real operational constraint an agent would otherwise hit blind.

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?

Five dense sentences with no filler; every clause delivers a fact. It is slightly telegraphic and lacks structure — parameter facts are strung in prose rather than front-loaded around a clear statement of what the tool returns — but nothing is wasted.

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?

There is no output schema, and the description does explain how to page (take next from the response as cursor), which is the most important return-value context. But for a 15-parameter filter tool with zero schema descriptions, skipping half the filters leaves an agent guessing at sorting and monetization behavior.

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% against 15 parameters, so the description carries the full explanatory burden and only covers five of them: country, the date format for the four date filters, upcoming, cursor, and limit. It says nothing about q, sort, order, language, minRating, minRatingCount, or monetization, and doesn't distinguish updatedAfter from releasedAfter beyond the shared format note.

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?

"Structured catalog filter" gestures at filtering a catalog, and the mention of country storefronts and apps implies the App Store catalog, but the description never states the verb+resource outright and never distinguishes itself from siblings like search_apps or trending_apps. An agent must infer from the title and the sibling list which one it wants.

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 description gives conditional semantics for individual parameters (upcoming=false drops pre-orders) but offers no guidance on when to pick this tool over search_apps or trending_apps, and no prerequisites or exclusions. The agent has to infer the search-vs-filter split on its own.

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