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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered elsewhere. The description adds useful context about id provenance ('Room type ids are those of the rooms of the hotel') and the API version, but says nothing about behavior on an invalid room id or how localization affects the 'facts' payload.

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 compact sentence with the resource stated first and the returned fields immediately after. The trailing 'API v3' is terse and slightly orphaned, but nothing else is wasted.

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?

For a read-only single-record lookup with three fully documented parameters and no output schema, the description gives enough to call it correctly and even sketches the returned payload. The missing piece is disambiguation from get_hotel_facts and any note on nonexistent room handling.

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% and two parameters carry enums, so the schema already defines every parameter. The description's only added value is a concrete id format example, which is a marginal gain over the documented 'Room type id, e.g. harmony-double' in the schema.

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 names a specific verb-plus-resource ('Details of one room type of a hotel') and enumerates what is returned: name, booking limits (maximum adults, children, total) and facts. It does not explicitly contrast itself with the sibling get_hotel_facts, so an agent may need a second look to confirm this is room-level, not hotel-level, data.

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 tool is for retrieving one room type, illustrated by the id example 'harmony-double'. There is no statement of when to call this versus get_hotel_facts or compare_hotels, and no prerequisites or error conditions are mentioned.

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