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

Annotations already establish readOnlyHint=true, idempotentHint=true, and destructiveHint=false. The description adds useful behavioral context beyond those, noting that results are ordered cheapest first and that well-reviewed Viator options are preferred at similar prices.

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?

Three sentences, each earning its place: the first states the core function, the second adds ordering and preference behavior, and the third gives the user-intent trigger. No filler or redundancy.

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 simple read-only search tool with a 100% documented schema, the description covers the essential behavior and use case. There is no output schema, so a more explicit note about return format would be nice, but the sorting and selection behavior already communicated make the definition practical.

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%, so the parameters are already well documented. The description adds the 'price cap' concept, which maps to max_price_dollars, and the 'budget-friendly' framing, but it does not need to add much because the schema carries the parameter meaning.

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 uses a specific verb ('Find') with a clear resource ('budget-friendly Hawaii tours and activities under a price cap'). It distinguishes itself from related siblings like search_hawaii_tours by emphasizing cost filtering and deal-oriented ordering, so an agent can tell them apart.

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 explicitly says 'Use when users want affordable Hawaii experiences or budget travel tips,' giving a clear trigger condition. It does not name sibling tools or state when not to use it, but the when-to-use direction is strong enough for selection.

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