bilibili_video_get_danmaku

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

With no annotations, the description carries the full burden. It discloses segmentation behavior via from_seg and to_seg parameters and states the return type, but it does not mention authentication, rate limits, or error handling. The read-only nature is implied by 'get' but not explicitly confirmed.

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 concise and well-organized with Args and Returns sections. Each line contributes necessary information without redundancy, making it easy for an agent to quickly parse.

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?

As a simple retrieval tool, the description covers the function and parameters. However, without an output schema, the return value is only described as 'danmaku list' with no structure, and it omits potential edge cases or limits, leaving some context gaps.

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?

The description adds meaning to all four parameters beyond the schema, explaining bvid as the BV number, page_num as starting from 0, and the defaults for from_seg and to_seg. This compensates well for the 0% schema description coverage, though it does not define 'segment' size.

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 '获取视频弹幕列表' (Get video danmaku list), specifying a clear verb (get) and resource (danmaku list for a video). This distinguishes it from sibling tools like bilibili_video_send_danmaku, which is for sending danmaku.

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 usage for fetching danmaku for a specific video, but it does not provide explicit guidance on when to use this tool versus alternatives. It lacks exclusion criteria or mentions of when not to use it.

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