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

No annotations are provided, so the description carries the burden of behavioral disclosure. It only reveals billing information (1 credit per call), which is minimal. It does not state that this is a read-only operation that fetches playlist metadata, nor does it disclose any side effects or requirements (e.g., valid playlist ID needed). The description is nearly empty of behavioral context.

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 short (one line), but it is under-specified, not concise. It provides a group label and billing info but no functional description. It is not well-structured because it fails to explain the tool's purpose or parameters, so it does not earn its place as a useful description.

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 the tool has 3 parameters, no annotations, and no output schema, the description is completely inadequate. It does not mention what data is returned, what the id parameter identifies, or how it differs from sibling tools like get_v1_playlist_videos. A full description is needed but absent.

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%, and the description provides no parameter information. The schema itself has examples (gl, hl, id) and a title for id, but the description adds nothing about what these parameters mean or how they relate to the tool's function. For a tool with 3 parameters and no schema documentation, the description does not compensate at all.

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 is a tautological group label rather than a functional description. It says 'Playlist Details Group: Playlist' and mentions billing, but does not state that this tool fetches details for a specific playlist using an ID. The title 'Playlist Details' plus name get_v1_playlist_details imply it, but the description fails to articulate the tool's purpose (getting playlist metadata given an ID).

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 guidance on when to use this tool vs sibling tools like get_v1_playlist_videos or get_v1_channel_playlists. It does not mention that the 'id' parameter is the playlist ID and is required for function. The only usage-related note is about billing credits, which is not contextual usage guidance.

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