set_user_book

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

With no annotations, the description reveals that unspecified fields are preserved (a partial update hint), but it omits prerequisite details (e.g., book must exist in user's library) and potential side effects (e.g., overwriting existing data). The description is adequate but not thorough.

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 consists of two short sentences (14 words) that front-load the main purpose. Every word is necessary; there is no fluff.

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?

Given 9 parameters, no output schema, and no annotations, the description is minimal. It does not cover return values, error conditions, or prerequisites like book ownership. However, the schema handles parameter details, so it reaches a minimally acceptable completeness.

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 coverage is 100%, so the baseline is 3. The description adds 'Preserves unspecified fields' as behavioral context for the many optional parameters, but does not explain individual parameter semantics beyond what the schema provides.

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 clearly states the verb 'Set' and the resource 'book's status, rating, review, privacy, and private notes', making its specific action evident. It distinguishes from siblings like add_user_book_read (new read), delete_user_book (deletion), and get_user_book (retrieval).

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 mentions 'Preserves unspecified fields', which implies partial updates, but does not explicitly contrast with siblings like add_user_book_read (adds a new read) or delete_user_book. No when-not-to-use guidance is given.

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