youtube_add_videos

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 and falls well short. For a mutation it never states that authentication is required, whether the caller must own the playlist, whether duplicate videos are skipped or error, or what partial-failure behavior looks like when adding many IDs.

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?

A single clean, front-loaded sentence with no filler or repetition. It is economically sized, though the brevity reflects under-specification rather than deliberate pruning of non-essential detail.

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?

A two-parameter mutation with no annotations, no output schema, and 0% schema description coverage needs the description to explain preconditions, auth, and failure modes. None of that is present, leaving the agent guessing about how to call it safely.

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% for both parameters, so the description must compensate, but it only loosely echoes 'video IDs' and 'playlist'. It omits the maxItems=50/minItems=1 constraints on video_ids, the required string format/minLength for playlist_id, and how ordering of the array is interpreted.

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 (add) and resource (video IDs to a playlist), so an agent can distinguish it from siblings like youtube_remove_videos or youtube_get_playlist. It does not explicitly name an alternative tool or scope the operation further, so it stops short of a 5.

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 phrase 'editable playlist' hints at a precondition, but there is no explicit when-to-use guidance, no statement of what makes a playlist non-editable, and no routing to alternatives such as youtube_remove_videos or youtube_get_playlist for inspecting existing contents.

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