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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety and network scope are covered. The description adds that results are paginatable via page_token and that three URL formats are tolerated, but says nothing about result ordering, page size, or termination conditions beyond the schema's token rules.

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 sentence with the primary action first and the pagination note last; no filler or redundant restatement of the tool name. Everything present earns its place.

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?

With an output schema, complete parameter documentation, and read-only/open-world annotations, the description only needs to establish scope and input forms, which it does. The remaining gap is routing context versus douyin_get_user_series_by_sec_user_id, which the description leaves to the agent.

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%, with page_token's opaque-token contract fully spelled out in the schema, so the baseline applies. The description only restates that page_token enables pagination and that profile_url accepts long/short links and share text, adding little beyond the structured field definitions.

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?

States a specific verb and resource (获取用户短剧列表) and scopes it to three input forms (主页长链接、短链接、分享文案), which implicitly separates it from the sec_user_id sibling. It does not explicitly name that alternative tool, so an agent must infer the routing from the input type.

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: the accepted input forms tell the agent this is the URL-based entry point. There is no explicit when-not guidance (e.g. 'if you already have sec_user_id, use douyin_get_user_series_by_sec_user_id'), and the 'don't pass 作品链接' exclusion lives only in the schema, not the description.

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