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

With no annotations, the description carries the disclosure burden and does well: it enumerates the return payload (rates, occupied periods, rules) and explains the conditional behavior of indirizzo_consegna (delivery feasibility). It doesn't cover permissions or error behavior for an unknown id, so it stops short of full transparency.

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, densely packed with distinct facts, front-loading the return contents before the usage instruction. No filler or restatement of the name.

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 compensates by describing the returned fields, and it explains the optional param's effect. Only error/edge behavior (e.g., nonexistent id) is left unaddressed, which is a minor gap for a single-item fetch.

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%, so the baseline is 3, but the description adds genuine semantics beyond the schema: passing indirizzo_consegna triggers a delivery-feasibility check, which the schema merely labels 'da verificare'. That consequence is real added meaning.

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 ('Ritorna il dettaglio di un oggetto a noleggio') and enumerates the returned content (descrizione, tariffe, foto, periodi occupati, regole), which distinguishes it from search/list siblings. An agent can tell exactly what this fetches without opening the 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?

Explicitly routes usage: 'Chiamalo prima di rentme_book_thing per scegliere date libere e tariffa' names the sibling and the reason for calling this first. This is a clear when-to-use instruction tied to a concrete alternative.

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