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

Annotations already cover read-only/idempotent/non-destructive. The description adds the valuable insight that the response is raw search rows and that the agent must derive categories and price levels itself rather than expecting structured guides. This is unusually candid about output behavior beyond what annotations provide.

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?

Two sentences, front-loaded with the use case, then the return-shape caveat. No filler. Slightly dense but every clause 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-structure detail is less critical, but the description still flags that the output is unsorted-ish search rows requiring derivation, which is the key operational fact. Combined with annotations, this is nearly complete; it could mention pagination or result limits if any exist.

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 100% and the schema already documents city, format, and language with defaults. The description adds no parameter-level guidance (e.g., that 'city' is a slug, which format to prefer). Baseline 3 is appropriate when the schema carries the parameters.

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+resource: returns a ranked list of a city's most popular bookable experiences, for orientation. The 'when the user wants an orientation overview' framing helps distinguish it from siblings like search_experiences or get_hidden_gems, though it doesn't name a specific alternative.

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?

Clear context for when to use: orientation overview for trip planning, as opposed to targeted searches. It doesn't explicitly exclude cases (e.g., 'not for specific queries'), but the guidance is strong enough to route most agents correctly.

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