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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the description's main added value is disclosing the response contents: variants, price range, public text. That is genuinely useful since no output schema exists, but it omits behavior on failure (unknown SKU) and whether all variants are returned or truncated.

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 core sentence is short and front-loaded, but roughly half the text is a Dutch translation that restates the same content verbatim for an English-reading agent, so not every sentence 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 simple two-parameter read tool with full schema coverage, what to pass and what comes back are both covered. Missing are the edge cases an agent would want: behavior when the SKU is unknown, and whether the price range implies currency/store-view dependence.

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 sku and store both documented including the nl default, so the schema does the heavy lifting. The description adds no parameter-level meaning such as whether store affects price or variant availability, which is the baseline 3 case.

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 names the resource ('one product from the feed') and enumerates what comes back: variants, a price range, and the public product text. That is specific enough to distinguish it from gnv_catalog_search (a search over many products), though it never explicitly contrasts the two.

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?

There is no when-to-use or when-not-to-use guidance in the description, and no alternative is named. The only routing hint ('Product SKU from gnv_catalog_search') lives in the schema, not the description, so an agent reading the prose alone gets no guidance about how to obtain a SKU or when to prefer the search sibling.

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