DNS-Shop Product Card

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

Annotations already signal readOnly, idempotent, and non-destructive; the description adds concrete failure modes (BadRequestError, TransportDownError, ParserDriftError) and the exact response shape, which helps an agent anticipate what happens on bad input or site changes. This exceeds the annotation-only picture.

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 compact: a one-line purpose followed by terse, structured Return/Error sections. It is slightly redundant with the existing output schema, but every line carries behavioral or format information, so it earns its place.

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 tool, the description covers the main action, return shape, and principal errors, which is sufficient given the annotations and output schema. It omits explicit usage guidance, but that is a minor gap at this simplicity level.

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 input schema already describes product_url fully with format and example, giving 100% coverage. The description does not elaborate on the parameter beyond referencing product_id in the return format, so it adds no new parameter-level meaning.

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 uses the specific verb 'Fetch' with the resource 'DNS-Shop product card', and the word 'one' clarifies it targets a single product rather than a search or listing. This distinguishes it from siblings like dns_search and dns_selfcheck, and the domain prefix separates it from other marketplaces' card tools.

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?

No guidance is given on when to choose this tool over alternatives; it does not mention dns_search for finding products first or dns_selfcheck for health checks. The only implied context is that it takes a product URL, which appears in the schema rather than the description.

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