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

readOnlyHint=true already covers the safety profile, and the description adds the underlying endpoint (GET /businesses/{businessId}/availability/booking-days), which is mildly useful context. It does not disclose the response shape (a per-day free/not-free flag), pagination, or how partial-day availability is treated, so it adds only modest value beyond annotations.

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?

Two short sentences, front-loaded with the behavioral meaning before the API path. Efficient, though the raw endpoint line is marginally useful to an agent and slightly dilutes focus.

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 read-only availability query with full schema coverage and no output schema, the description conveys the essential semantics: a per-day boolean availability result over a required date range for a service. Only the exact return structure and whether resource_id narrows the answer are left unstated.

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 100%, so all five parameters including from/to format examples, service_id, business_id default, and resource_id are fully documented in the schema. The description's mention of 'range' and 'for a service' merely echoes those parameters without adding syntax or constraints, so baseline 3 applies.

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: for each day in a range, report whether any slot is free for a service. That cleanly separates it from reservio_get_booking_slots (which returns actual slots) and reservio_get_event_days, though neither sibling is named explicitly.

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?

Usage is only implied by the purpose statement — an agent can infer this is the coarse day-level check to run before fetching slots, but the description never says when to prefer it over reservio_get_booking_slots or reservio_get_event_days, nor any prerequisites.

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