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

Beyond readOnlyHint/openWorldHint annotations, the description adds page size (100), ordering (playlist order), that metadata comes back alongside items, and the cost of 1 credit. That is meaningful operational context an agent can plan around; only retry/error behavior is missing.

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?

Four short sentences, front-loaded with the core resource, then ordering, page size, return shape, and cost. Nothing redundant or padded.

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?

With no output schema, the description usefully says what comes back (videos in order plus playlist metadata) and covers pagination and cost. Enough to call correctly; only the undocumented cache_max_age and public/private edge cases are uncovered.

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 67% and the schema documents playlist_id format (PL… or URL with list=) and cursor origin. The description adds nothing param-specific except implying pagination via '100 per page'; cache_max_age remains undocumented anywhere.

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?

First sentence 'Playlist contents' plus 'The videos in a public playlist, in playlist order' clearly states the resource and scope. It does not, however, differentiate from siblings like youtube_channelPlaylists or tiktok_playlistVideos, which an agent scanning the tool list would need.

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 word 'public' implicitly excludes private playlists and the required playlist_id is stated in the schema, but there's no explicit when-to-use or when-to-prefer-a-sibling guidance. With a large sibling set containing several playlist-ish tools, this is a real gap.

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