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

Annotations already declare readOnly=true, idempotent=true, destructive=false and closed-world, so the safety profile is covered. The description adds a genuinely non-obvious behavioral caveat: prices are not authoritative here because they vary by date, and it tells the agent what to do about it. It does not discuss freshness of the offer list or pagination, but those are minor given the annotation coverage.

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 compact sentences, front-loaded with the action and followed by the pricing caveat. The enumeration of return fields is slightly redundant since an output schema exists, but it is short enough not to waste space.

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?

With an output schema present, the description does not need to document return values in detail, and it still covers the one trap an agent would hit — treating listed offers as priced. For a simple two-param read tool this is close to complete, missing only guidance on the offer-to-booking handoff.

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% with two fully enumerated, defaulted parameters (season, language), so the schema carries the parameter burden. The description never mentions either filter, meaning it adds no meaning beyond the schema; baseline 3 applies.

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 ("Lists the current offers and packages") and concretizes it with examples (ski packages, summer escapes), then names the exact fields returned. An agent can distinguish this catalogue-listing tool from booking or availability siblings without opening a 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 an explicit routing rule for the main ambiguity: prices are date-dependent, so use check_availability or send the guest to the offer page instead of relying on this list. It does not say when to move from browsing here to request_offer or start_booking, which leaves part of the sibling routing to inference.

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