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

Goes well beyond the annotations: cheapest-room refundable-first pricing, ~4-minute quote lifetime, 'quoting books nothing and charges nothing', and the enumerated contents of the response. That non-obvious expiry window and the no-charge guarantee are exactly the traits an agent cannot infer from the schema or hints.

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?

Purpose is front-loaded in the first clause and every sentence carries operational content, including the failure-mode scripts. It is dense but slightly sprawling: the pricing and return-value details are interleaved with call-sequencing instructions rather than grouped.

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?

No output schema exists, and the description compensates fully by enumerating what the return contains (hotel, nights, taxed total, pay-at-hotel amount, cancellation terms, card) and which field to read aloud. For a stateful, money-adjacent tool it leaves nothing an agent needs in order to call it correctly.

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?

With 100% schema description coverage, the schema already documents property_id, check_in, rooms, adults and nights, so the baseline is 3. The description contributes the origin of property_id and clarifies that the quote prices the cheapest refundable-first room for the stay, but adds nothing about how rooms/adults/nights interact with pricing.

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 ('gets one bookable price for a hotel'), scopes it to the hands-free/partner-program audience, and names the sibling that produces the input (find_hotels_on_route). An agent can distinguish it from confirm_route_hotel and search_hotels without opening a 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?

Explicit lifecycle: quote first, read `spoken` word for word, then wait, and only call confirm_route_hotel with the quote_id and total_cents if the person clearly says yes. It also gives branch instructions for the 'hands-free not enabled' and 'partner program only' responses, so the agent has no ambiguity about when and how to proceed.

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