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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds genuinely new context beyond that: the link points to the hotel's own site and the guest selects dates and pays there, which tells the agent the transaction happens outside the system. It does not explicitly say the return value is a URL string, but that is strongly implied.

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 sentences, no filler, with the core action front-loaded and the limitations immediately after. Every clause carries information an agent needs.

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 one-parameter, read-only lookup with no output schema, the description covers purpose, the published-only precondition and the external payment flow. The only mild gap is that it never states the returned value is a link/URL as an explicit output, though the first sentence implies it.

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?

The schema already documents the single 'hotel' parameter at 100% coverage, including the identifier format and the elenco_hotel reference. The description only adds that the hotel must be 'pubblicato', which is useful but does not go meaningfully beyond the schema's own example and constraints.

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 states a concrete verb and resource: it returns the link to the official booking engine of a published hotel. It also scopes the result ('di un hotel pubblicato'), which lets an agent distinguish this from elenco_hotel or scheda_hotel without opening any schema.

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?

It clearly delimits when the tool applies by excluding what it is not: Iolee does not book and does not know prices or availability, so an agent should reach for this only to hand the guest off to the hotel's site. It stops short of naming a specific alternative for price or availability questions, so guidance is clear but not exhaustive.

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