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

Annotations already declare readOnlyHint=true, openWorldHint=true and destructiveHint=false, so the safety profile is covered. The description adds only the endpoint path and the fact that the from-date is a local date; it says nothing about the return shape, ordering, or pagination that a first-available-slots query would benefit from.

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 compact sentences with the scoping clause and the intended use front-loaded. The trailing 'GET /visits/first-available-slots' is arguably noise for an agent but costs little and is not padded prose.

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 eight parameters, 63% schema coverage and no output schema, the description is on the thin side. It conveys the essential purpose but does not describe the returned slot structure, ordering, or how from_date/to_date and service_duration interact, which an agent calling this correctly would want to know.

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 63%, leaving party_size, service_ids and resource_ids undocumented in the schema. The description partially compensates by naming these three as optional narrowing filters ('party size, services and resources'). It adds real meaning beyond the schema, though it omits to_date, max_num_slots and service_duration.

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 gives a specific verb+resource ('first available booking slots of a location ... from a date') and even names the underlying endpoint. It is clear what the tool returns, but it never distinguishes itself from the sibling waitwhile_list_booking_slots or waitwhile_resources_availability, so an agent still has to guess which of the slot tools applies.

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?

'Use it to propose appointment times' gives an implied usage scenario, but there is no explicit when/when-not guidance and no routing to alternative slot tools. The agent gets a hint of context but no conditions that select this tool over its siblings.

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