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

Annotations already declare readOnly/idempotent/non-destructive, and the description reinforces that with an explicit 'books and charges nothing' statement. It goes beyond the annotations by disclosing the itemization of price factors and the side effect that country targeting also places the item in that country's news-map list as one paid slot after the fourth story — real behavioral context. Auth requirements and any rate limits are still unstated.

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 dense sentences, front-loaded with the core action and closing with the read-only guarantee. Nearly every clause carries information, though the middle pricing-factor list is packed tightly enough to read as a run-on.

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 usefully says the response itemizes each factor, and it covers the mutation-free nature of the call. It leaves 'lang' undefined and does not state price currency or the units of the returned quote, which an agent pricing a placement would want.

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?

With only 25% schema coverage, the description compensates well: it maps 'topics' to topic tier, 'days' to duration, and 'country' to both targeting reach and the news-map placement behavior. Only 'lang' is left without any explanation in either the schema or the description.

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 (quote/price) and resource (a labeled, paid press-release placement in News by Hottub), and no sibling tool does anything comparable. It also names the determining factors and the response shape, so an agent knows exactly what it gets back 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?

The 'Quote ... Read-only: returns a price; books and charges nothing' framing makes clear this is the pre-purchase step and that calling it commits nothing, which resolves the key ambiguity an agent would have. It stops short of naming a companion booking tool or stating when not to call it.

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