get_book_readlists

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

The annotation already declares readOnlyHint=true, indicating this is a safe read operation. The description merely restates the action ('List readlists') and adds no behavioral context beyond that, such as whether it returns archived readlists, ordering, pagination, or error behavior for invalid book_id. Since it adds nothing beyond the annotation, the score is low.

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 concise sentence with no fluff. It is front-loaded and easy to parse. However, it is so minimal that it borders on under-specification, but for a simple copy operation, this level of brevity is acceptable.

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?

With only one parameter and an output schema present, the description is minimally adequate. It conveys the core function, but it lacks context about return value semantics, error cases, or how this tool fits among the many readlist-related siblings. The tool is simple, but the description could do more to guide usage relative to alternatives.

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 0% for the single parameter book_id, and the description only says 'containing a book.' The parameter name is self-explanatory, but the description does not clarify the expected ID format, whether it is a UUID or title, or any constraints. The description fails to compensate for the lack of schema-level documentation.

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 and resource: 'List readlists containing a book.' It clearly differentiates from sibling tools like list_readlists (lists all readlists) and get_readlist_books (lists books in a readlist) by inverting the relationship: given a book, find its readlists. The tool name and description align well.

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 its use case—when you have a book and want to know which readlists include it—but it provides no explicit guidance on when to use it vs alternatives (e.g., get_readlist_books or list_readlists). No exclusions or alternatives are named, so the use context is only implied.

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