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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and the unusual openWorldHint=false. The description adds real value beyond these by enumerating what is returned (official site, booking page, own booking channels, dated rules with sources) and by disclosing a distinctive behavior: flagging sites not on the company's listed domains. It stops short of noting freshness/latency or what happens for unlisted companies.

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, front-loaded with the triggering condition, then returns, then exclusions — a sensible ordering. The middle sentence is dense (site, booking page, channels, dated rules, personal actions all in one breath) but every clause carries information.

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 no output schema, the description must describe the return payload, and it does — enumerating official site, booking page, booking channels, dated rules with sources, and domain-mismatch flags. Combined with annotations carrying the safety profile, an agent has everything needed to select and call it.

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% and there is a single parameter, so the schema already fully documents 'where'. The description only implies the input via examples of company types and adds no syntax or format detail beyond the schema. Baseline 3 is the correct ceiling here.

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+resource: finding a named travel company's official site and booking page. It clearly delimits scope by saying it does not search fares/availability or book. Sibling differentiation is only implicit — the two siblings (change/cancel/refund, flight compensation) are never named, so an agent must infer the split.

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?

Opens with an explicit trigger condition ("Use this when a traveler asks how or where to book with a named airline, ferry, hotel...") and closes with explicit exclusions (fares, availability, booking). Both when-to-use and when-not are stated, leaving little to inference.

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