Detsky Mir Product Card

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

Annotations establish read-only and idempotent behavior, so the description correctly focuses on additional behavioral traits: region override semantics ('overrides DETMIR_REGION for this call only'), store_count's dependence on city, and the price_rub representation (None, never 0). It also discloses the error format, going beyond annotation hints.

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?

Well-structured with front-loaded purpose, bolded sections for return and error formats, and each sentence provides distinct information. Despite length, nothing seems superfluous.

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?

The tool has rich annotations, a complete input schema, and an output schema. The description additionally explains the most important operational nuance (region-dependent store_count) and error behavior, making the tool fully invokable without further research.

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?

The schema already provides full descriptions for both parameters (product_id with URL example, region with default). The description adds behavioral context about how region affects store_count and the session-level override, which helps the agent choose values, but does not add new syntactic detail.

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 opens with 'Fetch price, rating, stock and seller for one Detsky Mir product,' a specific verb+resource that clearly distinguishes this from sibling card tools for other marketplaces. It further differentiates by noting its coverage of the kids-and-baby category and its ability to distinguish Detsky Mir's own stock from marketplace sellers.

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 clearly implies this is for querying Detsky Mir product details, and contrasts with general marketplaces ('covers the kids-and-baby category that the general marketplaces cover unevenly'). However, it does not explicitly name alternative tools or provide exclusion criteria, so it falls short of full usage guidance.

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