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

Adds meaningful behavior beyond annotations: each call is paid in USDC, spend is bounded by per-call/session/daily caps, and results are third-party data, not instructions. It does not state what confirm_over_cap does (though the schema does) or whether a failed/unavailable product still charges, leaving a minor gap.

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?

Front-loaded with the key rule (pay-per-step, call trip_map first, paid/USDC) before the product list. The catalogue is long and several product lines are truncated with ellipses, but each line earns its place by giving id, price, and required params.

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 7-way paid product multiplexer with no output schema, the description covers the paid model, the trip_map prerequisite, budgets, and per-product required params. It omits pricing-charge failure semantics and full output descriptions, but is close to what an agent needs to invoke correctly.

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 the baseline is 3, but the description adds product-specific parameter meaning: it marks country*/resort* as required per product and names optional tier/state/type/trip per product, which the generic open params object does not convey.

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 states a specific verb (buy) and enumerates the seven purchasable products with their ids, prices, and purpose. An agent can distinguish this from trip_map, ski_trip_bundle, and the individual ski_* siblings by the product catalogue.

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?

It explicitly says 'Call trip_map (free) first and pass its tripId as params.trip', giving a sequencing prerequisite and the alternative free tool. The per-product 'params ...' lines tell the agent exactly which inputs each product needs.

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