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

Annotations already mark the tool read-only and non-destructive, and the description adds the important paid-plan/authorization requirement plus the weekly aggregation and 104-week cap. This goes beyond the annotations without contradicting them, although it does not disclose response format or potential empty results.

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 short and front-loaded with PAID, but 'PAID.' and 'Requires a paid plan.' are redundant statements. The core metrics are compactly listed, yet the duplicate warning means not every sentence earns its place.

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?

For a two-parameter read-only tool with full schema coverage, the description gives the essential operational context: what data is returned, the time range, and the paid-plan constraint. It lacks sibling routing, but nothing critical to actually invoking the tool with a valid ASIN and optional weeks is missing.

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 the input schema fully documents asin and weeks. The description adds no substantive parameter meaning beyond re-stating the 104-week cap and ASIN specificity, which are already present in the schema, keeping this at the schema-carrying baseline.

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 states the tool retrieves weekly Amazon price history for a specific ASIN and enumerates the included data points (Buy Box, lowest 3P-new, list price, sales rank, offer counts). It is specific and unambiguous, but it does not explicitly differentiate itself from the sibling get_product_price_history, so it stops short of full sibling distinction.

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 paid-plan requirement implies a precondition for use and the ASIN wording implies when it applies, but the description gives no explicit when/when-not guidance or reference to alternative tools. Sibling tools such as get_product_price_history exist, yet no routing or exclusion is provided.

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