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

The annotations already declare read-only, idempotent, non-destructive behavior, so the safety profile is covered. The description adds that it wraps `GET /api/v2/youtube/playlists` and how the returned playlist id is consumed elsewhere, but it omits pagination, permissions, and return-shape details.

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 short, front-loaded with the resource definition, and every element contributes useful context. The parenthetical endpoint reference and cross-tool usage note are compact and non-redundant enough for a concise tool definition.

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 low-complexity read-only list tool with one fully documented optional parameter, the description is nearly sufficient to invoke it correctly. It could be slightly more complete by noting whether results are paginated or what playlist fields are returned, since there is no output schema.

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 single optional `brandId` parameter is fully documented in the schema, including default behavior. The description does not add parameter-level meaning beyond what the schema already provides, so the baseline score of 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 the specific resource — playlists of the YouTube channel(s) a brand publishes to — and makes the scope clear. It does not explicitly contrast with sibling tools, but the resource is specific enough for an agent to distinguish it from generic list tools.

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?

It implies usage by explaining that a playlist id can be used as `youtube.playlistId` on create_content or publish. However, it does not explicitly say when to call this tool versus alternatives, nor does it describe when not to use it.

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