list_books

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

With no annotations provided, the description must carry behavioral disclosure on its own. It clearly states the operation is a read-only listing of all books and specifies the returned fields, which is adequate for a simple 0-parameter tool. It does not mention ordering, pagination, or auth, but these are not critical for such a straightforward listing.

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 efficient sentence that front-loads the action and resource, then lists the output fields. Every word contributes value and there is no redundant or filler content.

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 zero-parameter listing with an output schema available, the description covers the core action and result fields sufficiently. It could be slightly more complete by pointing to search_books for filtered lookup, but that is not essential for correct invocation.

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 tool has zero parameters and the schema coverage is 100%, so the description has no parameter semantics to add. Per the baseline for 0-parameter tools, this is appropriately handled by the schema and description.

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, 'List', with a clear resource, 'all books in the library', and even names the returned fields: slug, title, author. This makes its purpose unmistakable and separates it from the sibling search/get tools, which focus on narrower or different operations.

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 gives no explicit guidance on when to use list_books versus alternatives such as search_books or get_book_metadata. The phrase 'all books' implies a broad listing rather than a search, but no when-to-use or exclusions are stated.

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