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

Annotations mark it non-read-only, open-world, and non-idempotent, and the description meaningfully extends this with price ($0.08/call, product trip.bundle), USDC wallet charging, budget-cap enforcement, the confirm_over_cap override rule, and an untrusted-content warning. It omits failure/refund behavior, so it is strong but not exhaustive.

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?

Information is front-loaded (what it buys, then price, then payment mechanics, then caution), and each sentence contributes. Slightly dense with interleaved pricing and safety notes, but no filler.

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 paid, non-idempotent purchase tool with no output schema, the description covers cost, payer wallet, budget limits, the over-cap confirmation path, and data-trust caveats. Missing only return/error semantics, which keeps it from a 5.

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 schema already documents trip, resort, country, and confirm_over_cap. The description adds provenance for tripId (trip_map) and alludes to budget caps, but largely restates what the schema carries; baseline 3 is appropriate.

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 ('Buy') and resource ('every remaining step of a ski trip in one call'), which cleanly distinguishes it from the single-step sibling ski_trip_step and from trip_map. An agent can identify this as the bundled purchase tool without opening the schema.

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?

Gives concrete prerequisites (pass the tripId from trip_map; see the bundle price there) and a clear preview path (free_sample before paying). It stops short of an explicit 'do not use when' or a direct comparison against ski_trip_step, but the context for when to reach for it is clear.

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