Youtube.Playlist Items.List

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

No annotations, so the description carries the behavioral burden. It usefully signals that this call is quota-cheaper than search.list, which is real operational context, but it says nothing about pagination behavior, result caps, quota cost of this specific call, or auth requirements (API key vs OAuth).

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?

One front-loaded sentence with the key usage constraint in a parenthetical; nothing is wasted. It is arguably too terse for the parameter gap, but conciseness itself is good.

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 output schema covers return values, so that gap is excused. However, for a paginated list operation with a single undocumented parameter, the definition should say how many items come back and whether the caller must page.

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 coverage is 0%, so the description must explain playlist_id. 'Use the uploads playlist' only obliquely implies the parameter should be an uploads playlist ID; there is no mention of ID format, the UU-prefix convention, or where to obtain 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 ('enumerate') and resource ('playlist items') and even names a competing approach (search.list) that it should be preferred over. It does not differentiate from the closer sibling youtube.videos.list or youtube.playlist.add_item, but the core purpose is unmistakable.

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?

Gives an actionable directive ('use the uploads playlist') and an explicit alternative to avoid with a stated reason ('quota-scarce search.list'). No exclusions are needed beyond that, though it doesn't say when to reach for youtube.videos.list instead.

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