tnd_read_latest_chapter

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

With no annotations, the description carries the full behavioral burden; “读取” only implies a non-mutating read, while “已下载” indicates the content source. It does not explain how “last” is determined, missing-chapter or error behavior, output behavior, or how a positive max_chars affects the promise of “完整正文”。

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 single sentence is compact, front-loaded with the operation, and contains no filler. Missing operational detail is assessed in the other dimensions rather than mistaken for a structural problem here.

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?

This is minimally adequate for a simple two-parameter read tool whose required book_id and default max_chars are documented in the schema. The absence of annotations or an output schema makes the unresolved chapter-ordering, failure, and truncation behavior more consequential, though they do not prevent a 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?

Schema description coverage is 100%, so the baseline of 3 applies even though the description adds little parameter-specific information. It does not clarify positive max_chars values as a truncation limit, and its unconditional full-text wording could mislead when that non-default option is used.

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?

“读取某本已下载书籍的最后一章完整正文” clearly states the action, resource, and scope: read the full text of a downloaded book's last chapter. It does not explicitly distinguish itself from tnd_read_downloaded_chapter or tnd_read_downloaded_chapters, so it stops short of a 5.

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 phrases “已下载书籍” and “最后一章” provide a clear use case and a downloaded-content prerequisite. However, there is no routing to siblings for reading a specific chapter or multiple chapters, nor guidance on what to do when the latest chapter has not been downloaded.

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