Create, rename or delete a YouTube playlist

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

Annotations only declare destructiveHint=true and openWorldHint=true, but the description adds critical behavioral nuances: UPDATE merges and leaves omitted fields unchanged, DELETE does not delete videos but does delete links/embeds, and confirmTitle is required for public or non-empty playlists. It also notes 0 credits and the channel requirement. These details go well beyond the annotation flags, making the tool's side effects clear.

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, dense paragraph organized by action type. It contains no filler and every sentence adds necessary nuance, but the length might benefit from bullet points for readability. Still, it is efficient and front-loaded with the core action before diving into specifics.

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?

Given 7 params, destructive behavior, and confirm gates, the description covers default privacy, merge semantics, delete scope, confirm conditions, and the safe alternative. It also mentions the channel requirement and credit cost. Without an output schema, this is sufficient for an agent to call correctly, though it could mention what the response contains after a successful operation.

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% for all 7 parameters. The description enriches these: privacy defaults to private on create, omitted title/description on update means leave unchanged, and confirmTitle must match exactly for certain deletes. These semantic clarifications are not in the schema and meaningfully improve agent decision-making.

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 explicitly states the tool creates, updates, or deletes a playlist on the connected channel, which is specific verb+resource. It is clearly distinct from sibling manage_youtube_playlist_items (items) and list_youtube_playlists (listing). The title reinforces this, so an agent can easily understand the tool's purpose.

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 description offers concrete guidance on when to use update vs delete, explicitly recommending update with privacy=private as a reversible alternative to destruction. It also explains when confirmTitle is needed. However, it does not explicitly contrast with sibling tools like manage_youtube_playlist_items, though the action-level guidance is strong enough for most calls.

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