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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds genuinely useful behavior beyond that: it discloses the not-found error on an unknown username and describes the shape of each entry. It does not explain pagination behavior despite a page parameter, a minor gap.

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?

Front-loaded with the resource definition, then the sibling contrast, then the parameter meaning and error case. Dense with parentheticals but every sentence carries information; no 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?

An output schema exists, so return values need not be spelled out, and annotations cover the read-only/open-world profile. The description adds entry shape and error semantics; the only real omission is pagination guidance for the page parameter.

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 0%, so the description must compensate. It meaningfully defines username as the seller's Grailed username, but leaves the page parameter completely unexplained — no indication that it selects a page of results. Partial compensation only.

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 resource (a Grailed seller's individual buyer feedback entries) and enumerates the fields returned (rating, note, feedback tags, listing). It explicitly distinguishes itself from the sibling grailed_seller by noting that tool only carries the aggregate rating_average/rating_count.

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 contrast with grailed_seller ('reputation detail grailed_seller does not carry') gives clear routing: use this for per-entry reputation, use grailed_seller for aggregates. It stops short of an explicit when-to-use/when-not statement or naming any other alternative, but the sibling differentiation is concrete.

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