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 description adds that these are 'buyer' reviews specifically, but says nothing about pagination (despite the offset parameter) or result volume, so it adds only modest context beyond the annotations.

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?

Purpose is front-loaded and the alternative is appended, which is good structure. However, the id and offset glosses duplicate schema descriptions verbatim and do not earn their place given full schema coverage.

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, three-parameter listing tool with an output schema, the description needn't explain return values, and it covers purpose and sibling routing adequately. The omission of sort context is minor since the schema documents it fully.

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%, so id and offset are already documented; the description merely restates them and entirely omits the sort parameter. No format, default, or range guidance is added 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 and resource ('Returns buyer reviews for an Etsy listing') and explicitly distinguishes itself from the shop-level sibling via the final sentence. An agent can route between listing reviews and shop reviews without opening a 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?

Names the alternative tool (etsy_shop_reviews) and the scope difference (shop reviews vs listing reviews), giving a clear selection condition. It does not state edge cases such as what happens with an invalid id, but the core when-to-use routing is explicit.

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