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

The description adds valuable behavioral context beyond annotations: it notes that login is required and that other profile fields are left untouched. These details complement the annotations (readOnlyHint=false, destructiveHint=false) without contradicting them. It could mention duplicate behavior, but this is not a major gap.

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 compact and well-structured: the login requirement is front-loaded, the core action is stated in one sentence, and the example is short and illustrative. No filler or redundant explanation.

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?

For a simple mutation with a rich schema and annotations, the description is mostly complete. It covers login, scope, non-destructive behavior, defaults, and gives an example. It does not describe the return value or error cases, but that is not essential given the tool's simplicity.

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 coverage is 100%, so the baseline is 3. The description goes beyond the schema by providing an example mapping a user request to type/url/visibility, and by restating the visibility default. This adds practical semantics that help an agent infer correct parameter values.

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 action: '给当前用户加一条链接' (add a link for the current user), with a specific verb and resource. '不动其它字段' also distinguishes it from update/removal operations, and it is clearly differentiated from sibling tools like remove_profile_link and set_link_visibility.

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 provides clear context: login is required, the operation targets the current user's links, and the example demonstrates how to map a natural-language request to parameters. It does not explicitly name alternatives or when-not-to-use conditions, but the context is clear enough.

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