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 the returned fields (average rating, review count) and the backing endpoint, which is modest extra value, but says nothing about rate limits, pagination, or missing-SKU behavior.

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?

One compact sentence plus the endpoint path — the return content and SKU scoping are front-loaded with zero filler. Nothing could be removed without losing information.

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 single-parameter read-only tool with no output schema, disclosing the returned fields (average rating, review count) covers the main gap an agent would have. Some minor detail is missing (what happens with unknown SKUs, response shape per product), but the essentials are present.

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 the single sku parameter is fully documented there, including the semicolon separator and example. The description only restates 'by SKU (batch)', adding no format or edge-case detail beyond the schema, so the baseline of 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?

The description names a specific resource (product ratings) and states exactly what is returned — average rating and review count — plus the batch-by-SKU scope. It implicitly separates product-level ratings from the company-level sibling get_review_stats, but never names an alternative to make the distinction explicit.

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 '(batch)' parenthetical hints that multiple SKUs can be handled at once, but there is no statement of when to use this versus get_review_stats, get_review_nuggets, or the list_* siblings. No prerequisites, exclusions, or routing guidance are given.

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