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 adds useful behavioral context beyond the tool name: results include drafts, and the response covers status, pricing, and version info. However, it does not mention pagination, ordering, or the read-only nature, though 'list' strongly implies a read-only operation.

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?

Two terse sentences, front-loaded with the core action and scope. Every word adds value: 'all', 'authored by this account', 'including drafts', and the return-field list. No filler or redundancy.

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 simple parameterless list tool with no output schema, this description is mostly complete: it names the scope and the key return fields. The only gaps are minor— no mention of sorting, pagination, or whether the list includes books in all formats. These are not critical for basic 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, so there is nothing for the description to explain about inputs. Per rubric, a 0-parameter tool gets a baseline of 4. The description correctly focuses on output scope instead, which is appropriate.

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 states a specific action ('List') and resource ('books authored by this account'), with an important scope detail ('including drafts'). This clearly distinguishes it from sibling tools like search_books and get_book_details, so an agent knows exactly what this tool does.

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 conveys clear context: use this when you need books authored by the current account, including drafts. It does not explicitly name alternatives or say when not to use it, but the scope is unmistakable. Given the sibling list includes 'my_books', a more explicit exclusion would have been ideal, but it is not misleading.

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