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

Annotations already declare readOnlyHint=true, openWorldHint=true, destructiveHint=false, so the safety profile is covered. The description adds genuinely new operational context: the $0.005 per-request billing cost and the full list of returned fields including the feedback time windows. No mention of rate limits or failure modes, but the billing disclosure is a valuable addition.

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 dense sentences with zero filler; the identity/scope statement is front-loaded, followed by the return payload and the cost. Every clause carries information an agent can act on.

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 compensates by enumerating the returned fields (name, logo, about, registered business name/address, rating, total ratings, positive-feedback percentage, 30/90/12-month/lifetime breakdown). Combined with the annotations covering safety and the explicit cost, an agent has everything needed to call it correctly.

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 description coverage is 100% and both parameters are documented there, including the country default, so the baseline is 3. The description adds only that seller_id is sourced from main_buy_box.seller_id on amazon_product_details, which is a useful provenance hint but not format or constraint detail 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 ('Get an Amazon seller's profile by seller ID') and distinguishes itself from siblings like amazon_seller_products and amazon_seller_reviews by naming the exact entity returned. The parenthetical pointing at main_buy_box.seller_id from amazon_product_details makes the resource unambiguous.

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 clear context for when this tool applies by telling the agent where the required seller_id comes from (amazon_product_details), which is the key prerequisite. It does not explicitly say when to prefer amazon_seller_products or amazon_seller_reviews instead, so no exclusion guidance.

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