get_book_by_id

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only restates the operation and says 'full book details'; it does not explain what happens for nonexistent IDs, whether the call is read-only, or any authentication or error behavior.

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, tight sentence with no filler. It starts with the verb and resource, includes the key qualifier ('by Hardcover book ID'), and every word 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 one-parameter tool, the description gives the essential call pattern and indicates the return (full book details). However, it lacks additional context such as the complete expected behavior for missing resources or clarification of when to select this over the get_book_by_slug sibling, so the context is only minimally sufficient.

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% and the only parameter `id` is already described as 'Hardcover book ID'. The description repeats this without adding extra meaning, so it does not elevate 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 uses a precise verb+resource pattern: 'Get full book details' by 'Hardcover book ID'. The ID qualifier clearly distinguishes this from sibling tools like get_book_by_slug, get_editions_by_isbn, or get_author_by_id, so an agent can quickly understand the tool's focus.

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?

No guidance is given about when to use this tool versus alternatives. There is no mention of preferring get_book_by_slug when only a slug is known, or using get_edition_by_id for edition-level requests, leaving the agent to infer usage from context.

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