Add video to playlist

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

With no annotations and a single-sentence description, there is zero disclosure of side effects, permission requirements, error behavior, or what happens on success. The tool appears to be a simple mutation, but the description offers no additional behavioral context beyond the obvious.

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 extremely concise—a single sentence with no unnecessary words. It is front-loaded and easy to parse, though it might be too terse, lacking important context that would be useful.

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?

The tool performs a mutation on YouTube, but the description lacks essential context such as authorization needs, playlist ownership, duplicate handling, or expected output. With no annotations or output schema, the description is insufficient for an agent to fully understand the operation's implications.

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?

The input schema provides descriptions for all three parameters (account, videoId, playlistId), covering 100% of the semantics. The description adds no further meaning, so the baseline of 3 applies.

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 action: 'Add a video to a playlist.' It uses a specific verb and resource, and it is distinct from sibling tools like create_playlist or delete_playlist, leaving no ambiguity about its function.

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, what prerequisites are needed, or how it contrasts with alternatives. The description merely states the action without any contextual cues, leaving the agent to infer usage from the name alone.

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