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

Annotations already declare readOnlyHint=true, so the safe-read behavior is covered. The description adds that posts are public and that page_token pagination is supported, but does not disclose rate limits or response shape; the output schema covers the latter. 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 a single, dense sentence containing three useful pieces: the core purpose, input sourcing guidance, and pagination support. It has no filler, though the multiple clauses make it slightly less scannable than a two-sentence structure.

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 the highly detailed schema and an output schema, the description covers the essential operational aspects: what the tool fetches, where to source the profile_url, what not to pass, and pagination. It does not explicitly mention alternative tools, but that is not critical for calling this tool correctly.

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%, and the schema descriptions for both profile_url and page_token are extremely detailed, including exact sources, exclusions, and opaque-token rules. The main description only adds a usage hint about reusing author.profile_url, which is helpful but not necessary given the schema's depth.

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 verb '获取' (get) and the resource '公开用户帖子列表' (public user posts list) keyed by profile_url. It distinguishes itself from sibling tools by name and by emphasizing the profile_url input, but does not explicitly name the user_id/username alternatives.

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 concrete guidance: use a non-empty author.profile_url from other results or a user-provided x.com/twitter link, and explicitly warns not to pass post links. It mentions pagination support but does not explicitly tell when to choose sibling tools based on available identifiers.

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