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

Annotations already cover readOnlyHint, idempotentHint, and destructiveHint, so the behavioral bar is lower. The description adds real value beyond them: affiliate:true marking, that links are non-ad booking paths, and the NOT_FOUND behavior for unknown ids.

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?

A single dense sentence with the 'Read-only' lead front-loaded, followed by an enumeration of return contents and the NOT_FOUND clause. It is information-rich; the long enumerated list is slightly heavy but every element earns its place.

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?

An output schema exists, so return values need not be re-explained, but the description still usefully previews contents and the NOT_FOUND case. The missing coverage of three booking parameters is the main incompleteness for a 4-param 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 only 25%, so the description carries the burden for adults, check_in, and check_out, yet it says nothing about them. Only the id param is clarified, and that via the schema itself. The three undocumented params are a clear gap.

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 (get) and resource (full details for one BostonVacay listing by id), clearly distinct from sibling search_listings which finds listings. The scope and identity are fully clear.

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?

The description implies this is the detail-fetch step after a search, and the id parameter guidance ('Listing id from search_listings') reinforces the workflow. However, it never explicitly states when to use this versus search_listings or rules out other entry points.

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