bilibili_user_modify_relation

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

With no annotations, the description carries the full burden of disclosing behavioral traits. It only lists actions and a vague return ('操作结果') without addressing side effects (e.g., what 'remove_fans' actually does), permissions, rate limits, or reversibility for mutations. This is a significant gap for a mutation tool.

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-structured: a one-line purpose statement, a short Args list, and a Returns line. Every sentence earns its place, and the format is easy to parse. There is no wasted text.

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?

Given the tool's complexity (five action types) and lack of annotations or output schema, the description is incomplete. It fails to clarify what each action entails, what the operation result looks like, or any side effects. This makes it insufficient for an agent to confidently invoke the tool in nuanced scenarios.

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 schema has zero description coverage, so the description must compensate. It provides brief explanations ('uid: 目标用户UID', 'action: 关系操作类型') and clarifies the enum actions in Chinese, which adds minimal value beyond the schema's titles. However, it does not elaborate on parameter constraints, relationships between parameters, or the precise meaning of actions like 'remove_fans' in context.

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 the tool's purpose with a specific verb ('修改' / modify) and resource ('用户关系' / user relationship), followed by a list of concrete actions (关注/取关/拉黑/取消拉黑/移除粉丝). This distinguishes it from sibling tools like user_get_info or user_get_followers, which are read-only.

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 clearly implies when to use the tool: whenever you need to change a user relationship (follow, unblock, etc.). It is the only sibling tool for modifying relations, so the context is clear. However, it does not explicitly state when not to use it or mention alternatives for related actions (e.g., viewing followers), so it stops short of a 5.

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