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

Annotations already cover read-only, idempotent, non-destructive and open-world, so the description is not carrying the safety burden. It still adds real behavioral context: results are newest-first, the page size is bounded, website links are included, and media URLs plus private import/administration fields are withheld — the last point is valuable because it prevents the agent from promising media links it will never get.

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?

Three short sentences, front-loaded with the operation and then the pagination loop; nothing is padded. The closing clause about website links and omitted fields is the weakest part, since an output schema already exists and return-field enumeration is lower value here.

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?

For a simple three-parameter read with full annotations and an output schema, the description covers provenance of the ID, ordering, pagination and field exclusions — enough to call it correctly. Minor gaps remain: no numeric limit bounds and no explicit pointer back to search_comedy_channels as the ID source.

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?

With 0% schema description coverage the description must compensate, and it does partially: channelId must be a previously returned ID, limit is a bounded page size, and offset continues from a returned nextOffset. It does not state the actual bounds (limit max 8, default 3) or explain what happens when offset exceeds the catalog size.

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?

"Read a returned channelId and a bounded newest-first page of its catalog videos" gives a specific verb (read) and specific resource (a channel's catalog videos), which separates it from the search_* siblings and from get_comedy_video. It never names a sibling explicitly, so the differentiation is inferential rather than stated.

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?

"Read a returned channelId" tells the agent this is a follow-up detail call that needs an ID from a prior search, and "Continue with nextOffset" tells it how to paginate until done. There is no explicit when-not guidance or named alternative for obtaining the channelId.

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