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

Annotations already declare readOnlyHint and openWorldHint, so safety is covered; the description adds that data is sourced across all retailers and quotes the underlying GET endpoint, confirming the open-world read behavior. It does not mention pagination limits or response size, which keeps it short of a 5.

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 dense sentence that front-loads the resource and field list, followed by the endpoint. No filler, though the colon-separated field list and trailing endpoint push it toward run-on.

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?

There is no output schema, and the description compensates by naming the returned fields (price, condition, fulfilment, best offer), which is what an agent needs to know it can read competitor pricing. Pagination behavior for the 'page' parameter is left unexplained, a minor gap.

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 coverage is 100% with descriptive enums, so the parameters are already fully documented. The description only restates that best-offer, condition and country narrowing are available, adding no format or default detail beyond the schema (country default NL is only in the schema).

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?

States a specific verb and resource (offers on bol.com for one EAN), enumerates the returned fields (price, condition, fulfilment, best offer), and the 'from all retailers' scope implicitly separates it from bol_list_offers/bol_get_offer, which deal with the caller's own offers.

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 sentence 'Optionally only the best offer or one condition and country' hints at the filtering modes but never states when to choose this tool over bol_get_offer (single offer) or bol_list_offers (own offers). Usage is implied rather than prescribed.

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