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

Annotations already declare readOnlyHint=true and openWorldHint=true. The description's mention of 公开用户信息 (public info) is consistent with these and adds a slight context that the data is public, but it does not materially extend beyond what the annotations already convey. No contradiction with annotations.

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 front-loaded: purpose first, then a usage caution. Both clauses earn their place with no filler. It could be slightly more expansive on usage context, but for a single-parameter tool this length is well balanced.

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?

An output schema exists, so the return shape is covered outside the description. The parameter is exhaustively documented in the schema, and the description covers purpose plus a key sourcing caution. For a read-only, single-parameter tool, nearly everything an agent needs to call it correctly is present.

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 profile_url parameter description is exhaustive, specifying accepted formats and exclusions. The tool description adds only 'don't pass post links,' a point already captured in the schema. At full schema coverage, baseline 3 is appropriate.

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 states a specific verb (获取/get) and resource (公开用户信息/public user info) keyed by a specific identifier (profile_url). It is clearly distinguishable from the sibling get_by_user_id and get_by_username tools, which operate on different identifiers, and from get_user_posts_by_profile_url, which returns a different 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 a clear sourcing instruction (use non-empty author.profile_url from search/detail/comment results) and an explicit exclusion (do not pass post links). The schema description is equally rich, listing exactly where to obtain the URL and what formats are valid. It does not explicitly name alternatives like get_by_user_id when an ID is available, but the identifier-based differentiation is effectively conveyed.

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