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

Annotations already declare readOnly, idempotent, non-destructive, and openWorld, so the safety profile is covered. The description adds genuinely new behavioral context with 'Free.' (cost transparency not expressible in the annotations) and enumerates the returned content, which helps the agent anticipate results.

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 front-loaded sentence with the cost note leading, followed by a compact parenthetical catalog. The list is dense but every clause maps to returned content; slightly heavy on parenthetical enumeration.

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 an output schema present and schema coverage at 100%, the description need only frame the tool's scope. It does so well, describing the shop and its offerings; the only minor gap is not calling out the shop_search handoff explicitly.

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?

There is a single parameter whose schema description already reads 'Which partner shop.' with full description coverage. The description adds no syntax or enumeration 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?

Names a specific resource (the Mint & Marquee partner shop) and enumerates exactly what it returns: product catalog, product count, price range, and search guidance. The trailing 'how to search it' hints at the shop_search sibling without naming it, so sibling differentiation is implied rather than 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 'Free.' prefix signals zero-cost usage, and 'how to search it' implies this is a precursor to searching. However, it never states when to use this versus shop_search, nor that it takes no required arguments, leaving the use/alternative decision to inference.

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