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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds that figures come from the agent's own market scans and includes a 'boats checked' sample-size indicator, which is useful context, but says nothing about freshness, caching, or coverage limits for destinations with few scans.

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?

It is a single dense sentence with no filler, but it front-loads a long list of metrics before establishing what the tool is for, making it harder to scan. It earns most of its words but is poorly ordered.

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 explain return values, and it covers data source, granularity and the key sample-size caveat. The main remaining gap is routing guidance relative to sibling pricing tools, which is squarely a usage-guideline issue.

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% and the single country enum is fully documented, so the baseline is 3. The description adds that output is broken down by destination, month and boat type even though only country is filterable, which is mildly useful, but it blurs 'destination' and 'country' without clarifying that month/boat type are not filter parameters.

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 names the exact metrics, granularity (destination, month, boat type) and source ('agent's market scans'), so it is clear this is a read of aggregated market pricing rather than an individual quote. It does not use a verb, and differentiation from trip_cost or is_good_deal is only implicit via 'market scans'.

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?

There is no statement of when to use this tool, when not to, or which sibling (e.g. trip_cost, is_good_deal, search_deals) to prefer for a given question. The agent must infer usage entirely from the metric list.

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