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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false, so the safety profile is covered. The description adds a useful non-annotation detail: the flat cost of 5 points per successful run. It says nothing about result volume, pagination, or how many offers are returned, which is a real gap for an offer-listing tool.

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 short sentences: the first front-loads the resource, scope, and returned fields; the second states the cost. Nothing is wasted and the most important information comes first.

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?

For a read-only, two-parameter lookup with no output schema and full annotation coverage, the description covers purpose, returned fields, and cost. The one missing element is any indication of result volume or pagination behavior, which an agent calling across 19 domains might want to know.

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%, so both parameters (asin, domain) are already documented with examples and the full domain enum. The description confirms the ASIN key but adds no syntax or default semantics beyond the schema, so the baseline 3 applies.

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 (Get) and resource (all marketplace offers for an Amazon product by ASIN) and enumerates the fields returned (price, condition, seller, delivery). This clearly distinguishes it from run_amazon_product (product detail) and run_amazon_product_search, though neither sibling is named explicitly.

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?

Usage is implied by the 'offers' framing, but there is no explicit when-to-use guidance or routing versus run_amazon_product, run_amazon_product_search, or run_amazon_seller. The agent must infer that this is the tool for offer/listing data rather than catalog or seller data.

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