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

Annotations already declare readOnlyHint/idempotentHint/destructiveHint=false, so safety is covered. The description adds genuine domain constraints beyond that: a 90-day booking horizon, 10:00–16:00 window starts, and no evening bookings. It stops short of saying what happens when no slots are available or how results are ordered.

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 tight sentences, front-loaded with the resource returned and followed by the operating constraints. No filler or restated metadata.

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?

There is no output schema, and the description only loosely sketches the return shape ('dates and 2-hour arrival windows'). Combined with undocumented parameters and no guidance on empty results, the definition is adequate but has clear gaps for a booking-availability lookup.

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%, so the description must explain both parameters, and it explains neither: it never mentions `days` (1–31, default 14) or `from_date` (the search start date). Worse, 'up to 90 days ahead' can be read against the schema's 31-day maximum for `days`, leaving the distinction between search range and booking horizon unresolved.

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 resource (dates and 2-hour arrival windows that can be requested), so an agent knows it returns availability rather than performing a booking. It does not explicitly differentiate itself from siblings like create_booking, but the resource noun is specific enough to distinguish it.

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: the phrase 'that can be requested' hints this is a pre-booking lookup step, but the description never says when to call it versus create_booking or get_quote, and names no alternatives. No exclusions or prerequisites are given.

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