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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds real value beyond that: it discloses the return payload (rating, text, date, reply), the ordering (newest first), and the auth requirement ('Cotlet API key with access to this app') — the kind of prerequisite context annotations don't carry.

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?

The first two sentences largely restate each other ('Reviews of your products with rating, text, date and your reply, if any' vs 'Returns reviews of your products, newest first, with rating, text, date and your reply when there is one'), duplicating the field list at the cost of brevity.

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?

With no output schema, the description responsibly describes the returned fields and sort order, and it flags the app-access requirement. For a no-required-param, read-only listing tool this is nearly complete, though pagination behavior (the cursor flow) is left unstated.

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 the schema already documents since, cursor, product_id, and unanswered_only. The description touches on the unanswered concept and default sort but adds no syntax or format detail beyond the schema, so 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?

The description gives a specific verb+resource (list reviews of your products) and enumerates the returned fields plus sort order, which is enough to distinguish it from the sibling getyourguide_reply_to_review. An agent can tell what it does without opening the 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?

It offers one implied use case — 'Filter to unanswered reviews to build a reply queue' — which nudges toward the unanswered_only flow. However, it never explicitly states when to use this versus reply_to_review or other listing siblings, so routing guidance is only implicit.

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