get_book_details

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

No annotations are provided, so the description carries the full burden. It describes the observable behavior—returning metadata and format links—but does not mention side effects, authentication needs, or failure behavior. For an apparently read-only 'get' tool this is acceptable, though not fully transparent.

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 a single well-structured sentence that conveys the action, resource, and scope with no wasted words. It is front-loaded and easy to scan.

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?

The tool is simple, has an output schema, and the description covers the core behavior. However, it omits guidance on how to obtain the identifier and does not connect to sibling tools like search_books. These gaps reduce completeness for an agent that needs to invoke the tool correctly.

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?

The schema provides only a parameter named 'identifier' with no description, and schema description coverage is 0%. The description says 'for one Calibre book,' slightly clarifying that identifier refers to a book, but it does not explain what kind of identifier to use or where it might come from. The description does not adequately compensate for the low schema coverage.

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 uses a specific verb ('Return') and clearly identifies the resource ('detailed metadata and available format links') and scope ('one Calibre book'). This makes the purpose distinct from sibling tools like search_books, which return search results rather than details for a single known book.

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 use case: obtaining metadata for a specific, already-identified book. However, it does not explicitly state when to prefer this tool over siblings, when not to use it, or that the identifier should likely come from search_books.

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