apple_books_charts

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

No annotations are provided, so the description bears the burden of behavioral disclosure. It mentions the data comes from Apple's public marketing-tools RSS JSON feed, hinting at public data, but does not disclose defaults, pagination, rate limits, or response format. Behavior remains largely opaque.

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 three sentences, front-loaded with the action, and not overly verbose. Minor redundancy ('chart rankings' repeated) is acceptable. It is overall concise and structured effectively.

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?

Given the lack of annotations and output schema, the description provides insufficient context. It does not explain default behavior when no parameters are provided, expected result structure, or any limitations. The moderate complexity of four optional parameters warrants more contextual details.

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 schema already documents all four parameters (genre, limit, country, collection). The description adds no additional parameter semantics beyond what the schema provides, aligning with the baseline of 3.

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 Apple Books chart rankings, with specific supported collections (`top-free` and `top-paid`). This distinguishes it from other Apple Books tools like `apple_books_book` or `apple_books_search`, making the purpose unambiguous.

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 implies the tool is for chart rankings but does not explicitly say when to use it versus alternatives. There are no named alternatives or when-not-to-use conditions, though the supported collections provide some parameter-level guidance.

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