Get bookable times

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

Annotations already cover the read-only, idempotent, non-destructive profile, so the description's added value is in what is returned: the slot's day plus the next available days for the same clinic and doctor. The special lab-test case (a single walk-in window with an example string) is genuinely useful disclosure that annotations cannot convey.

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, front-loaded with the core purpose and followed by the lab-test edge case and the booking next step. The Italian example string is a little heavy but earns its place by showing the exact format an agent will encounter.

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 carries the burden of describing the return shape, and it does so adequately: a per-day list of bookable times, with the lab-test variant spelled out. It omits error/empty behavior, but nothing essential for a correct call is missing.

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 baseline is 3, but the description adds meaning beyond the schema: results are 'day by day', starting with the slot's day then the next available days. That clarifies what the `days` parameter actually counts against (available days, not calendar days), which the schema alone leaves ambiguous.

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: exact bookable times for a slot, day by day, and names the sibling (cup24_get_availability) that supplies the slot_id. It also anchors the behavior to the website's 'Scegli data e ora' picker, so an agent can distinguish it from the availability search tools.

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?

Makes the follow-up relationship explicit ('slot from cup24_get_availability') and gives the next step for booking ('open the slot's booking_url'), which is a clear usage path. It does not state exclusions, such as what to do when no slot times are returned or when to prefer get_availability instead, but the implicit sequencing is strong.

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