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

Beyond the readOnly/idempotent annotations, the description discloses substantive behavior: no address carries dates (each site opens its own search), sites pay commission that never affects listing, the disclosure must be shown, and paying entries must be marked `paid` as 'Ad'. That is exactly the kind of monetization and output-handling context an agent cannot get from structured fields.

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 purpose is front-loaded, which is good, but the body is a single dense run-on sentence packing categories, direct-booking brands, and monetization rules together. Information density is high but readability suffers; a few sentences would have been clearer without losing content.

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 carries the return-content burden and does so well, specifying categories, ordering, per-link filling for place and route, and the paid/Ad marking. It stops short of describing result structure or any pagination/limit behavior, but for a read-only link-list tool this is nearly complete.

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 every parameter is already documented in the schema, setting a baseline of 3. The description adds only marginal semantics (from_city yields the reader's country and currency, reader_country defaults from it) and largely restates the category ordering already covered by the `kind` enum.

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 states a specific resource (booking links for one place, ordered by category and tailored to the reader's country) and a clear scope, which distinguishes it from siblings like how_to_get_there or activities. The framing 'as the place's page shows it to that reader' is slightly indirect, but an agent can still tell what it returns 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?

Usage is implied rather than stated: the tool is for getting where-to-book links once you have a place, and from_city is noted as needed for flights/airlines. There is no explicit when-not-to-use or named alternative among the siblings, so the routing guidance is only inferable.

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