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

Beyond readOnlyHint and openWorldHint, the definition discloses concrete behavior: it returns a list of videos or Shorts, normalizes tab subpage URLs to the channel homepage, treats page_token as an opaque token that must be passed unmodified, and explicitly rules out live/course/playlist types. This gives the agent actionable expectations.

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 main description is a single front-loaded sentence that immediately communicates purpose and input. The schema's page_token explanation is thorough but includes some redundant prohibitions; overall it is well-organized and useful.

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 read-only list operation with an output schema, three well-documented parameters, and detailed pagination/token rules, the definition is complete. An agent has everything needed to make a correct first call and continue pagination 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_description_coverage is 100%; channel_url, video_type, and page_token all have detailed descriptions in the input schema. The free-text description adds no additional parameter-level meaning, so the baseline of 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 states a specific verb-resource pair: 获取频道发布视频或 Shorts 列表 (get the channel's posted videos or shorts) from a YouTube channel homepage link. This clearly differentiates the tool from siblings like channel info, video detail, comments, or search.

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 schema gives strong contextual guidance: acceptable channel_url forms, what not to pass, when to reset page_token, and video_type restrictions. However, the description never explicitly says when to prefer this tool over sibling tools such as youtube_get_channel_info_by_url, so alternative selection is implied rather than stated.

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