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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is largely covered. The description adds that only public catalog metadata is returned, which usefully scopes the payload (no user/private data) but goes no further on caching, rate limits, or freshness. Adequate additive context for an annotated read-only tool.

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?

A single tight sentence that front-loads the enumeration and closes with the downstream-use note. Every clause carries information; nothing is padded or restated from the name.

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 and zero parameters, the description does not need to explain return values and correctly doesn't. It covers what is returned, what it's for, and where to pass it. Naming the neighboring channel-adjacent tools it differs from would make it complete.

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?

The tool takes zero parameters, so the baseline is 4. The description earns that baseline by clarifying the semantics of the OUTPUT as an input to another tool's 'channel' parameter, which is the one thing an agent actually needs to know here.

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 ('List') and a precise resource ('DramaBox's closed app channel set'), then enumerates the actual members (Popular, New, Rankings, Categories, Anime, Live-Action, VIP, Original+). It explicitly differentiates from the sibling dramabox_theater by pointing to it as the consumer of these channel names.

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 explains the downstream purpose: the returned name is what you pass as dramabox_theater's channel parameter, which tells the agent exactly when to reach for this tool. It stops short of stating when NOT to use it (e.g. vs. dramabox_categories or dramabox_genres, which are adjacent siblings), so it is strong but not fully routing.

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