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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety and open-world profile is covered. The description adds one piece of real context, that results are 'normalized,' but says nothing about pagination behavior (though page/page_size exist in the schema), rate limits, or how date-range narrowing affects results. Adds some value over annotations but not rich context.

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 core capability and no filler. The second sentence earns its place as a routing hint, though it is a somewhat unusual negative redirect rather than positive scoping guidance.

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 explained, and annotations carry the safety profile. With full parameter coverage and a clear purpose statement, the definition is nearly complete; only richer when-to-use scoping against the other Expedia tools is missing.

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%, so all seven parameters are already documented with descriptions, formats, defaults and maxima. The description only restates that destination is free-text and that a date range applies, adding no syntax or constraint detail beyond the schema. Baseline 3 is correct.

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: returns 'Expedia Things To Do (activities/tours) search results' for a destination and date range, which is more specific than the tool name alone. It routes the agent away from flights but does not differentiate from the many other Expedia siblings (properties, locations), so it stops short of a full 5.

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 only usage guidance is a negative redirect: 'Use expedia_flights_search to search Expedia flights.' That tells the agent when NOT to use this tool, but never states when to use it (e.g., for tours, attractions, or ticketed experiences) or how it relates to expedia_properties_search or expedia_locations_search. Usage is only implied.

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