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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds that the result is a ranked ('ranglijst') selection of top products rather than a raw listing, which is useful behavioral context, but it says nothing about ranking criteria, result size, or whether prices/links vary by market.

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?

A single front-loaded sentence that states the resource first and appends examples; no filler or repetition. It is efficiently sized, though it is arguably too terse to carry usage or output context.

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?

With no output schema, the description should ideally indicate what a ranking entry contains (product, score, price/link per market) and how the market parameter affects results. It conveys the shape of the answer loosely ('ranglijst van de beste producten') but leaves the return contract and the markt/categorie interaction implicit.

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 50%: markt is fully documented in the schema (enum, default, meaning of 'uk'), but categorie has no schema description at all. The description partially compensates by giving three example category values, which helps the agent populate the undocumented required parameter, though it adds no syntax or matching guidance.

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?

Names a specific resource (a ranking of the best products within a category) and gives concrete category examples (eiwitten, creatine, pre-workout), so the agent understands it returns a curated 'best of' list. It does not, however, distinguish itself from catalog/search siblings like search_catalog or lookup_catalog, which an agent could easily confuse with a category-based product query.

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 explicit when-to-use, when-not-to-use, or alternative-tool guidance. With eleven siblings including search_catalog, zoek_producten and lookup_catalog, the description never says why an agent should pick this ranking tool over a plain product lookup for the same category.

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