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

Annotations already declare readOnlyHint and openWorldHint, and the description adds real value beyond them: only public playlists are returned and each call costs 1 credit. It doesn't cover pagination behavior beyond the cursor param.

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?

Three short sentences, zero filler, with the purpose stated first and the chaining hint second.

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?

No output schema, but the description tells the agent what the results are (public playlists) and that IDs are reusable downstream. A note on pagination result shape would make it fully complete.

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 67%; the description clarifies that the returned `id` is the input to the playlist tool, which the schema does not convey. The handle formats are documented in the schema and cache_max_age is left unexplained.

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 resource and scope ('Channel playlists. Playlists a channel has made public'), which clearly separates it from youtube_playlist (videos inside a playlist) and youtube_channelVideos.

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?

Explicitly names the follow-up tool and how to chain: 'Pass an `id` from here to /v1/youtube/playlist for the videos in it.' No when-not guidance or comparison against youtube_channelVideos, so it stops short of a 5.

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