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

Annotations already declare readOnlyHint=true, so safety is covered. The description adds that results are bookable start times and notes the HTTP verb, but says nothing about pagination, result volume, rate limits, or what a returned slot contains. Adding the 'bookable' framing is useful context but leaves most behavioral traits undisclosed.

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 plus the endpoint reference, with the core capability front-loaded. 'High-value for scheduling' is mild filler and the raw GET path adds little for an agent, but there is no wasted 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 no output schema, the description should ideally explain what a returned slot looks like (provider, location, time, operatory) and how it feeds into booking. It covers the input scope adequately but leaves the return shape and downstream usage implicit, which is a real gap for a discovery/availability tool.

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 seven parameters (days, lids, pids, subdomain, start_date, slot_length, overlapping_operatory_slots) are already documented. The description only restates the date-range/provider/location dimension and adds no syntax or default details beyond the schema, so the baseline of 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: finding bookable appointment start times across providers/locations for a date range, plus the underlying GET endpoint. This is clearly distinguishable from siblings like nexhealth_list_appointments (booked appointments) and nexhealth_book_appointment (mutation). No sibling is named explicitly, but the 'bookable' qualifier does the differentiation work.

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?

'High-value for scheduling' implies the tool is used in a booking flow, which hints at when to reach for it. However, no alternative is named (e.g., 'use before nexhealth_book_appointment') and there are no exclusions or prerequisites stated, leaving usage to inference.

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