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

Annotations already provide readOnlyHint=true, and the description goes further by disclosing playlist ordering, ID/URL input flexibility, and the up-to-500-per-page behavior with ids_only. This adds meaningful behavioral context beyond a simple 'list' label.

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?

Two sentences, no filler. The first sentence states the core behavior, and the second covers input forms and the ids_only pagination nuance. Every phrase earns its place.

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 an output schema present, readOnlyHint=true, and full schema documentation on parameters, the description covers the important nuances: playlist-order listing, accepted id shapes, and ids_only pagination constraints. No major calling concern is left unexplained.

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 100%, so the baseline is 3. The description adds extra detail: id can be a PL... id or a URL with list=, limit has a 500 cap only with ids_only, and ids_only changes the response shape to video IDs. This goes beyond the schema descriptions.

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 (list videos), the resource (a playlist), and a distinctive behavioral property ('in playlist order'). It does not explicitly distinguish itself from search_playlist_videos, but the list-vs-search distinction is reasonably inferable from the wording.

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 description gives clear context: it accepts a PL... playlist id or a list= URL, and explains the ids_only option and page-size behavior. It does not explicitly say when to choose this tool over alternatives like search_playlist_videos, but the intended call pattern is clear enough.

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