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

Annotations already declare readOnlyHint=true and openWorldHint=true, covering the safety profile, so the bar is lower. The description adds the capability summary (page_token pagination, sorting, category filtering), which is useful behavioral context, but does not elaborate on result limits, error behavior, or implications of the open-world hint.

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?

A single dense sentence that front-loads the purpose, then usage routing, then capability summary. Every clause earns its place with no filler or repetition of schema content.

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?

Combined with a 100%-coverage schema, an output schema, and safety annotations, the description covers purpose, usage conditions, exclusions, and capabilities. The only gap is that it doesn't surface the open-world implication that incomplete search results don't imply absence, though the annotation already signals this.

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% and the schema descriptions are unusually thorough: negative examples for keyword, full enum expansions, and opaque-token rules for page_token. The description's mention of pagination/sorting/filtering adds little beyond the schema, so the high-coverage baseline of 3 applies.

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 opens with a specific verb+resource pair ('搜索 Bilibili 专栏文章'), clearly stating this tool searches column articles. It differentiates from siblings by contrasting with detail/comment tools for existing links/IDs, and from bilibili_search_videos by the article vs video resource.

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 gives explicit when-to-use ('用户需要按搜索词查找专栏时使用') and when-not-to-use guidance ('已有视频、专栏或动态链接，或已有内容 ID 时使用对应的统一详情或评论工具'), naming the alternative tool category. Nothing is left to inference.

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