Add Video to YouTube Playlist

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

No annotations are provided, so the description carries full burden. It does add constraints that the video must be public and the playlist must be owned by the authenticated channel, but it omits side effects, permissions, behavior if the video already exists, and error cases. This is insufficient for a mutation tool.

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 a single clear sentence with no superfluous content. It is front-loaded and efficiently states the core purpose.

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 no annotations, no output schema, and 0% schema coverage, this one-sentence description is inadequate for a 3-parameter mutation tool. It fails to clarify essential details such as parameter meanings, prerequisites, and expected behavior.

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 0% and the description provides no explanation of the parameters. The presence of both 'url' and 'video_url' is ambiguous, and 'position' is entirely unexplained, leaving an agent to guess which URL refers to the playlist and which to the video.

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 uses the verb 'Adds' and specifies the exact resources: a public video to a playlist owned by the authenticated channel. This clearly distinguishes it from sibling tools like youtube_remove_playlist_item and youtube_reorder_playlist_item.

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?

No guidance is provided on when to use this tool versus alternatives. It does not mention exclusions (e.g., private videos) or point to sibling tools for removal or reordering.

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