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

Annotations already declare readOnly/idempotent/non-destructive, so the opening "Read-only" is largely redundant. What earns credit is behavior annotations do not cover: it re-reads the owner's calendars on each call and holds nothing, and it discloses the response contents (room/unit prices, totals with cleaning fee and taxes, cancellation policy, deposit due).

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?

One front-loaded sentence that leads with the safety profile and then the payload; every clause carries information. It is a dense run-on list of return fields, but nothing is padding.

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 correctly compensates by enumerating what comes back, and the calendar re-read clarifies freshness. The main gap is the undocumented guests parameter and the absence of any hint about failure modes (unavailable dates, unknown slug).

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 75%, with slug, check_in and check_out each already described (including formats) in the schema. The description only restates "one property and dates" and says nothing about the guests parameter or its bounds, so it adds little beyond structured fields.

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: live availability for one property across a date range, with the return contents enumerated (prices, totals, fees, cancellation policy, deposit). The clause "nothing is booked or held" implicitly separates it from request_booking, but no sibling is named outright, so an agent still has to infer the boundary.

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 implied rather than stated: read-only plus "nothing is booked or held" signals this is the pre-booking quote step before request_booking, but the description never says when to prefer it over search_stays or get_property, nor that a slug must first be discovered elsewhere. Adequate but leaves routing to inference.

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