use_book

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

No annotations are provided, so the description carries the full behavioral burden. It discloses the key stateful behavior — setting a default book_id for subsequent tools — but does not clarify whether it overwrites an existing default, how long the default persists, or what happens if the book_id is invalid.

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, front-loaded sentence with no wasted words. It states the action and the resulting default behavior immediately.

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 one-parameter context-setting tool with full schema description coverage and no output schema, the description is nearly complete: it explains the action and its effect on later calls. A minor gap is the lack of detail about lifecycle or overwrite behavior, but the essential information is present.

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 meaning beyond the schema by explaining that the book_id parameter becomes the default for subsequent tools when they omit it, which clarifies the parameter's role as persistent context rather than just a target identifier.

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 (设置 / set) and resource (book_id), and it clearly differentiates the tool from sibling tools by explaining that it establishes a default context for subsequent operations rather than performing a list or upload action.

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?

It gives clear usage context: call this to set the current operation's book_id, and later tools will use it by default if they are not given a book_id. It does not explicitly state when not to use it or name alternatives, but the guidance is sufficient for a simple context-setting tool.

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