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

No annotations are provided, so the description carries the full burden. It states the tool returns full subtitles and mentions billing per call, but it does not disclose any side effects, authentication requirements, rate limits, or what happens if the video has no subtitles. The billing note is a minor behavioral disclosure, but it is insufficient.

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?

The description is very short and front-loaded with the core purpose. The 'Group: ✨ Exclusive endpoints' and billing info are extra but not verbose. It is concise, though the billing info could be considered noise for an agent.

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?

Given the tool has no parameters and no output schema, the description is the only source of context. It does not explain how to specify which video, what the output format is, or any limitations. For a tool that presumably requires some input (like a video ID), the lack of context is a significant gap.

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 has zero parameters, and the schema coverage is 100% (empty schema). The description does not need to explain parameters because there are none. The baseline for zero parameters is 4, and the description does not add any misleading parameter info.

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 states the tool gets the full subtitles of a video, which is a clear verb+resource. However, it does not distinguish this from sibling tools like get_misc_emojis or get_misc_locations, though the resource (video subtitles) is distinct enough. The 'Group: ✨ Exclusive endpoints' and billing info add context but not purpose differentiation.

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 provides no guidance on when to use this tool versus alternatives. It does not mention any prerequisites (e.g., needing a video ID) or exclusions. The billing note implies it is a paid endpoint, but that is not a usage guideline.

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