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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and non-destructive behavior, so the safety profile is covered. The description does add value by naming the returned fields (title, price, provider, page URL), which matters since no output schema exists, but says nothing about result ordering, pagination or truncation behavior.

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?

Two short sentences, purpose first, return shape second, with zero filler. Every clause 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 three-parameter read-only search with a fully documented schema, the description supplies the missing piece – the return fields – since there is no output schema. It stops short of explaining result ordering or whether results span multiple languages, which would be the last gap to close.

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% – query, limit and lang all have their own descriptions and an enum for lang – so the schema carries parameter meaning. The description adds nothing beyond what the schema states, which merits the baseline 3.

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 ("Search business services on B2B Market") with concrete domain examples, which tells an agent this is service search rather than product search. It never names siblings like search_products or get_service, so differentiation is left to inference from the word "services".

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 or when-not-to-use guidance and no reference to alternatives such as get_service (single lookup) or search_products (item search). The only usage signal is implicit in the examples of service categories.

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