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 that results span articles, videos and micro-posts and that pagination is supported, which is genuine behavioral context, but it gives no detail on pagination limits, ordering, or rate constraints.

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?

A single compact clause states the action, the input form, and the coverage in one pass with zero filler. Nothing is buried and nothing is redundant.

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 return-value explanation is unnecessary, and annotations cover the safety profile. With params fully documented and the description covering content types and pagination, the definition is close to complete; only explicit sibling routing and pagination behavior are left implicit.

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%, so all three parameters (page_token, profile_url, content_type) are fully documented in the schema, including the enum values and the non-reusability of page tokens. The description only echoes content-type coverage and pagination, adding no syntax or format detail beyond the schema. Baseline 3 applies.

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 names a specific verb (读取/read), resource (发布的作品/published works) and access path (通过头条用户主页链接/via the user's profile URL), plus the content scope (文章、视频、微头条). It is clear what the tool does, but it does not itself differentiate from the sibling toutiao_get_user_posts_by_user_id — that routing hint lives only in the 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?

Usage is only implied by the required profile_url parameter and the name suffix; the description neither states when to prefer this tool over toutiao_get_user_posts_by_user_id nor describes any prerequisite. The explicit alternative-naming exists in the schema's profile_url description, not in the description text, so the agent must open the schema to be routed correctly.

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