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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds useful context beyond that: the exact set of returned profile fields and the negative disclosure that post/reply lists are not returned. It does not mention auth requirements or rate limits, so it is strong but not exhaustive.

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?

Three compact sentences with the core verb and returned fields front-loaded, followed by routing guidance. Dense but every sentence carries routing or scope value; nothing is redundant padding.

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?

With an output schema present, the description need not explain return values, and annotations cover safety. Along with the routing rules and URL sourcing, an agent has everything needed to call it correctly; only minor operational details (auth, limits) are absent.

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 itself documents the expected URL form and rejects numeric IDs, nicknames, and post links. The description goes further by telling the agent where to obtain a valid profile_url (search, post detail, or comment author fields), adding source guidance beyond the schema.

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?

States a specific verb (读取) and resource (百度贴吧用户主页资料) and enumerates exactly which fields are returned (资料、签名、粉丝数、关注数、累计获赞、吧龄、IP 属地). It explicitly contrasts itself with baidu_tieba_get_user_info_by_user_id, so an agent can distinguish it from the sibling without opening either schema.

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?

Gives explicit when-to-use ('已有 profile_url 时优先使用本工具'), where the URL can be sourced from (搜索、帖子详情或评论作者的 profile_url 字段), and names the alternative plus its triggering condition (仅有数字用户 ID 时使用 by_user_id). It also states a scope exclusion (不返回发帖或回复列表).

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