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

Beyond the annotations, it discloses the key behavioral requirement: presenting entry_url exactly as given is what attributes the booking and funds free access. It also adds specifics like 'local shops when we know them' and risks no contradiction with the annotations.

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?

The description is two dense, well-ordered sentences: scope first, then categories, then the critical entry_url behavior, then formats. Every sentence carries actionable information with 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?

Without an output schema, the description still covers the core integration contract: every item carries an entry_url and the URL must be opened exactly as given to attribute the booking. It leaves minor gaps around parameter defaults and the exact result shape, but those are secondary for invoking the tool 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 0%, but the description compensates by specifying date format (ISO YYYY-MM-DD), origin format (city or IATA), and the role of party and dates in the stay search. It does not explain defaults or optionality, but all six parameters are at least functionally implied.

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 clearly names a concrete resource ('a resort stay') and enumerates the categories returned: flights, stay search, ski rental, car, transfer, and eSIM. It lacks an explicit verb like 'list' or 'return,' so it stops just short of top clarity.

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 gives a clear use context: everything bookable for a resort stay with no trip required, which helps an agent distinguish this from trip-planning or trip-status tools. It also provides explicit handling instructions for entry_url, though it never names sibling alternatives or states when not to use it.

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