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

Annotations already declare readOnlyHint/idempotentHint/destructiveHint=false, so the safety profile is covered. The description adds genuine behavioral value beyond that: on failure it enumerates the reason categories (already booked, minimum-night stay, too many guests, pets not allowed) and states that nearby open dates are suggested, which tells the agent to read the response rather than treat it as a boolean.

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: what it does, what happens when it fails, and where to go for price. The most decision-relevant content (single-property scope) is front-loaded and there is no filler.

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 does the right work by characterizing the return (a verdict plus enumerated reasons plus suggested alternate dates). What's left unstated is the response's shape (e.g. whether 'available' is a boolean flag or whether suggestions are date pairs) and error handling for a bad property_id.

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 every parameter (property_id, check_in/check_out, adults, pets, children, language) is already documented in-schema. The description only restates 'specific dates and party size' and hints that pets matter; it adds no format, default, or constraint detail beyond the schema. Baseline 3 is appropriate.

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?

Specific verb ('Check whether ... can be booked') plus a tightly scoped resource: exactly one property, for specific dates and party size. The scope word 'one' and the sibling reference to get_quote let an agent place this against search_properties and get_property_details without opening a schema.

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 get_quote for the price' explicitly routes the agent to the correct alternative and implicitly scopes this tool away from pricing. It also lists the failure conditions that make a negative result worth reading. It stops short of an explicit exclusion (e.g. 'use search_properties for multiple properties'), which keeps it at 4 rather than 5.

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