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

Annotations already communicate a destructive, open-world side effect, and the description reinforces that this action books a hotel and requires a saved payment method. It does not, however, add details beyond that, such as whether payment is captured immediately, whether the booking can be canceled, or what confirmation is returned; the output schema covers return values, but cancellation/charge behavior is left implicit.

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 put the core purpose first and then the two essential ID sources. There is no filler, and the parameter-to-upstream-tool mapping is easy to parse in a single pass.

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 9-parameter destructive booking action, the description plus a fully described schema and output schema gives the agent enough to assemble the call and know there will be a response. It could be more complete by noting charge/cancellation behavior or that the rate can expire before booking, but these are not blockers.

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?

Every parameter is fully described in the input schema, so the schema carries the semantic burden. The description restates the provenance of gondola_rate_id and payment_id, but since the schema already names get_hotel_details and get_payment_methods, the description adds little new parameter meaning beyond grouping them into a workflow.

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 opens with a specific action ('Book a hotel room') and the exact input needed ('a rate from get_hotel_details'), making the tool's purpose unmistakable. It also names the resource type ('hotel'), which separates it from the vehicle-booking sibling without relying on the tool name.

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 gives concrete preconditions: guest details, a saved payment method, and a rate from get_hotel_details, and explicitly says to obtain payment_id via get_payment_methods. It doesn't state when not to use this tool or point to an alternative (e.g., book_vehicle), but the hotel context and prerequisite chain make the use case clear.

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