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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is well covered. The description adds content-level context but no additional behavioral traits such as rate limits, required permissions, or data-source caveats. This is acceptable given the strong annotation coverage.

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 description is a single front-loaded sentence with no filler or redundant information. Every clause adds value: the resource, the nature of the output, and the specific countries covered are all stated efficiently.

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?

This is a simple read-only tool with one optional parameter, a rich schema, an output schema, and strong annotations. The description provides enough detail about the returned content and the supported countries for an agent to invoke it correctly without further clarification.

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%, with the schema already documenting the optional country parameter and its DE/AT restriction. The tool description reinforces that DE and AT are the supported countries but does not add new meaning beyond the schema, so the baseline score of 3 is appropriate.

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 states a specific verb and resource ('Return an overview of the supported shops') and enumerates concrete contents: shipping cost tiers, free-shipping thresholds, and countries DE/AT. This clearly differentiates it from siblings like get_shipping_breakdown or get_best_price, which focus on transactional or pricing details rather than shop-level overviews.

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 description says what the tool returns but gives no guidance on when to prefer it over alternatives or when not to use it. It does not mention any sibling tools or conditions that would route an agent to get_shipping_breakdown, get_best_price, or optimize_cart instead.

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