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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds useful context that the returned link is the guest-facing self-booking path rather than an internal booking action. It says nothing about link lifetime, whether the URL is pre-filled from the optional parameters, or whether it is per-category or per-request.

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?

Very short and front-loaded with the core fact (the URL), followed by the alternative. The full German restatement is redundant for an agent that already parsed the English sentence, which costs it the top score, but total length is still minimal.

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 correctly explains what is returned (a URL), but three of five parameters are undocumented and it is silent on whether the optional parameters shape the link. For a tool whose main misuse risk is passing adult/child/night values that silently do nothing, this leaves a significant gap.

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 description coverage is 0% across five parameters, so the description carries the full burden and fails to explain adults, children and nights – the agent cannot tell whether these prefill the booking link or filter availability. Only category_key is obliquely hinted at by 'this category'.

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 the concrete artifact returned: 'The URL where the guest books this category on the website', which lets an agent distinguish it from the other siblings. It is a noun phrase rather than verb+resource, but the intent (retrieve a self-service booking URL) is unambiguous.

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 names one alternative, create_reservation, but never states the condition that selects between them – the agent must infer 'use this when the guest should book themselves rather than have the agent create the reservation'. No guidance on interaction with get_availability/get_price_estimate, which normally precede a booking decision.

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