Youtube.Playlist.Add Item

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

No annotations are provided, so the description carries the full behavioral burden for a mutation tool, and it discloses almost nothing. 'Guarded' hints that some confirmation gate exists but doesn't say the confirm parameter is the gate, what value it takes, or what happens if it is omitted; there is also no mention of quota cost, idempotency, or whether duplicates are rejected.

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 single sentence is front-loaded and free of waste, but it is terse to the point of losing necessary information — the 'guarded' suffix dangles without explanation. Efficiency here comes at the cost of completeness rather than through disciplined editing.

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?

An output schema exists, so return values need not be explained, but for a three-parameter write operation with no annotations the description leaves the confirmation mechanism, ID formats, and failure behavior entirely undocumented. An agent could not confidently invoke this tool from the description alone.

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 compensate and largely doesn't. It implies that playlist_id and video_id correspond to the playlist and video, but gives no format guidance (raw IDs vs. URLs), and the third parameter, confirm, is never mentioned at all despite 'guarded' gesturing at it.

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 verb and resource — 'Add a video to a playlist' — and even names the underlying API method (playlistItems.insert), which clearly separates it from the read-only sibling youtube.playlist_items.list. It stops short of 5 because it says nothing about scope, limits, or what 'guarded' means in practice.

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?

There is no explicit when-to-use or when-not-to-use guidance, and no mention of alternatives (e.g., use youtube.playlist_items.list to verify before adding). The trailing '— guarded' implies a precondition exists but never states what it is or how to satisfy it.

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