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

annotations 已声明 readOnlyHint=true，因此安全性方面由结构化信息覆盖。描述额外补充了“支持 page_token 翻页”和“只返回一级评论”的行为，但没有进一步说明结果数量限制、无评论时的行为等；在已有 annotations 的情况下仍然够用但不算丰富。

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?

描述只有一句话，但完整包含了动作、资源、范围和分页能力，信息密度高且前置了核心用途。没有任何冗余或重复 schema 的内容。

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?

对于只有 2 个参数、有输出 schema、且已带 readOnlyHint 的只读工具，描述加上 schema 已覆盖调用所需的全部关键信息：URL 来源、一级评论范围、分页令牌规则。没有明显缺失的调用要素。

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 描述覆盖率 100%，url 和 page_token 的语义都已在 input schema 中详细说明，尤其是 page_token 的不透明令牌规则。工具描述本身只重复了翻页能力，未在 schema 之外增加参数含义，因此符合高覆盖率的基线评分。

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?

描述使用具体的动词“获取”、明确的资源“TikTok 作品页面链接”和范围“一级评论”，清楚说明工具做什么。与 tiktok_get_post_comments_by_post_id 和 tiktok_get_post_comment_replies 相比，按 URL 和一级评论的表述足以区分，不需要打开 schema 即可判断。

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?

描述给出了使用场景：有 TikTok 作品页面链接且需要一级评论时使用，并提供翻页能力。但它没有明确说明与替代工具的边界，例如需要评论回复时应改用 tiktok_get_post_comment_replies，或者已有 post ID 时应改用 tiktok_get_post_comments_by_post_id；这些区分只能从工具名和“一级评论”中推断。

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