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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds useful context beyond them: what the two filters accept semantically (type of business/treatment vs. town, province or area) and what a result contains (name, slug, address, Google rating, website, booking link, services with prices). It does not discuss result limits or pagination, keeping it below 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?

Three tight sentences, front-loaded with purpose, then parameter semantics, then the return shape. Every clause conveys information an agent needs; no filler.

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?

An output schema exists, so the return-field list is partly redundant, but it is short and harmless. For a zero-required-parameter, two-filter search with covering annotations, filter semantics and result contents are both addressed; only the optional/default behavior of the empty filters is left 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 0%, so the description must carry the parameter burden, and it does: it explains that `what` is the business type or treatment and `where` is a town, province or area, with concrete Italian-language examples for both. The only gap is that it does not mention that both default to an empty string / that filters are optional.

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 plus a meaningful scope qualifier ('businesses that can be booked online with Kaio'), which tells an agent this is a discovery tool rather than a fetch-by-id or booking tool. It does not name any sibling explicitly, so it falls short of the 5 benchmark for sibling differentiation, but the scope qualifier does most of that work.

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?

Searching for businesses is implied by the verb and the two filter arguments, so an agent can infer the context. However, there is no statement of when to prefer this over get_kaio_business, or of any prerequisite, exclusion, or empty-filter behavior, and no sibling is mentioned.

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