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

Annotations already declare readOnlyHint and openWorldHint, so safety is covered. The description adds meaningful context beyond that: pricing is 'live', offers are the 'highest current buyer offer per size', and data is localized via country. It does not mention caching or rate limits, but the freshness/live-data note is valuable.

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?

A single front-loaded sentence naming the tool's scope first, then its data payload. The long parenthetical list is dense but well-organized; no wasted framing. Slightly heavy but earns its length by enumerating returned fields.

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-value shape need not be explained, and annotations carry the safety profile. The description still enumerates the payload for selection purposes and covers both required params via schema. Complete for a 2-param detail endpoint.

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 fully documented in the schema, including the slug format and country_code default. The description mentions 'full size range' and per-size pricing but adds no syntax or format detail for the parameters themselves. 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 resource (GOAT product detail) and enumerates precisely what it returns: identity metadata, live per-size/condition pricing, stock status, and highest buyer offer. This clearly differentiates it from siblings like goat_search, goat_product_recommended, and goat_listings_count, which serve other purposes.

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 'product detail' framing (fetch full detail for one product), but there is no explicit when-to-use guidance, no mention of needing a slug obtained from goat_search or a URL, and no exclusions versus goat_product_recommended. Adequate but leaves routing to inference.

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