youtube_add_to_playlist

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It doesn't disclose whether auth is required, whether adding is reversible (delete via youtube_remove_from_playlist), rate limits, error behavior on invalid playlist/video IDs, or side effects. The description only states the basic mutation action.

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?

Efficient docstring-style format with each parameter on its own line. Each sentence earns its place, no filler or redundancy. Could include more behavioral detail but the structure is clean and scannable.

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 mutation tool with no annotations and no output schema, this description is thin. It doesn't explain auth requirements, return values, error conditions, or whether added videos can be reordered. Given 40+ sibling tools exist and the tool mutates external state, more context is warranted.

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 0%, so the description must fully explain the parameters. It describes playlist_id, video_id, and position with reasonable clarity including default behavior ('Defaults to end'). However, it doesn't explain what a Playlist ID vs Video ID looks like, or what 'position' constraints exist beyond 0-based, leaving some ambiguity at 0% schema coverage.

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 clearly states the verb ('Add') + resource ('a video to a playlist'), which is specific and unambiguous. It distinguishes well from sibling tools like youtube_remove_from_playlist and youtube_create_playlist, though it doesn't explicitly name them.

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 on when to use this tool vs alternatives. It doesn't mention prerequisites like needing authentication (youtube_auth), whether the playlist must be owned by the user, or when one might prefer create_playlist vs add_to_playlist. No exclusion rules or context provided.

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