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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The only added behavioral detail is the 24-items-per-page pagination cap, which is also stated in the schema's page description, so the description adds little beyond structured fields.

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, front-loaded with the core action and followed by the routing guidance. Every clause earns its place with zero filler.

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, annotations covering safety, and 100% schema coverage on 2 params, the description is complete: it defines what it returns (paginated products) and how to obtain the required category_id.

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 100% and both parameters are well documented (page is 1-indexed, category_id format with example). The description only restates that page selects the page and 24 items per page, adding no meaning beyond the schema.

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 ('Fetch one page of products for a Best Buy category_id') and names the exact siblings it is distinct from (bestbuy_categories, bestbuy_category_subcategories, bestbuy_search, bestbuy_product). An agent can route to it without opening any schema.

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?

Explicit when/when-not routing: 'bestbuy_categories... to discover IDs', 'bestbuy_search for keyword results', 'bestbuy_product for one SKU'. It leaves no ambiguity about which tool to pick for ID discovery, keyword search, or single-item lookup.

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