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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so safety is covered. The description adds meaningful domain context beyond that: currency (USD), the two price modes (one-time and Subscribe & Save), and the fields returned per pack. Only minor gaps remain (e.g., no note on how the two price modes relate to the filter).

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?

A single dense sentence with the subject (prices), scope (USD, both pricing modes), and payload (bottles, nights, price per bottle) front-loaded. No filler or redundancy.

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?

There is no output schema, and the description compensates by enumerating the returned fields, which is exactly what an agent needs for this lookup. It does not address result ordering, availability, or how maxPrice behaves against Subscribe & Save prices, so it is slightly short of 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 coverage is 100% and the single maxPrice parameter is fully documented in the schema as a one-time-price ceiling. The description's mention of 'one-time and Subscribe & Save' adds light context about pricing modes but does not clarify how the filter interacts with Subscribe & Save pricing. Baseline 3 applies when the schema carries the parameter detail.

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 (prices for Noddie Night packs) and enumerates the returned data shape (bottles, nights, price per bottle). It is clearly distinct from siblings like get_product_facts and search_noddie_night, though it never explicitly names or contrasts them.

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 description says what the tool returns but gives no when-to-use guidance, no prerequisites, and no routing away from alternatives such as get_product_facts or search_noddie_night. Usage must be inferred entirely from the purpose statement.

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