best_bookmarks

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

With no annotations, the description carries the full burden of explaining behavior. It discloses one useful behavior (chapter_uid=0 searches the entire book), but it does not explicitly state that this is a read-only listing, how highlights are ordered/scored, or what '选句素材' implies about the returned content.

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 one compact sentence with no filler; the key parameter behavior is placed in a parenthetical. It is economically written, though the parenthetical style makes it feel more like a note than a structured definition.

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 two-parameter tool with an output schema, the core invocation is roughly covered: book_id is required and chapter_uid=0 fetches the whole book. However, the description still omits when the tool should be chosen over sibling tools and leaves the purpose slightly implicit, so it is only minimally complete.

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%, so the description must compensate. It partially explains chapter_uid via the 0=whole-book behavior, but book_id is left to the reader and no format or value semantics are given.

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 identifies the tool as returning popular highlights (热门划线) intended as sentence-selection material, which is a specific resource and purpose. It does not use a verb like 'list' or 'fetch', but the resource is clear enough and the 'best'/'热门' framing separates it from review and bookmark tools.

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?

No guidance is given on when to use this tool instead of sibling bookmark/reader tools such as get_reader_bookmark, add_bookmark, or list_comments. The only usage hint is the parenthetical that chapter_uid=0 queries the whole book, which is a parameter behavior, not a decision rule.

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