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

Annotations already declare readOnlyHint and openWorldHint, so the description's extra notes about return values (prices, ratings, amenities) add some value. It does not disclose deeper behaviors like pagination, rate limits, or result sorting, but for a simple read-only search this is moderate coverage.

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?

The description is two lines of purpose plus a compact Args block. It is front-loaded with the main verb and resource, and contains no redundant or filler content. Every sentence 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?

For a tool with only two parameters and no output schema, the description covers the main purpose, output content, and parameter meanings. It lacks a detailed return structure, but the mention of prices, ratings, and amenities provides a reasonable baseline. Minor gaps remain around result format or additional constraints.

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 fully compensates by explaining each parameter. It provides an example for destination ('Tokyo, Japan') and notes the default for max_results (20). This is more than sufficient for the two-parameter input 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 opens with 'Search Booking.com for hotels', which is a specific verb and resource. This clearly distinguishes it from sibling tools like search_airbnb and search_tripadvisor. The addition of 'Returns prices, ratings, and amenities' clarifies the output scope.

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 provides clear context by specifying Booking.com as the search platform, which implies when to use this tool. However, it does not explicitly mention alternatives or exclusions, such as 'use search_airbnb for vacation rentals', so it falls short of a perfect score.

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