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

With no annotations, the description carries the full burden of explaining behavior. It mentions 'async' but does not disclose what happens after submission, whether a job ID is returned, how the callback URL is used, or side effects such as storage or rate limits.

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 a single, focused sentence with no redundant words or irrelevant details. It is highly concise.

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 seven parameters, no annotations, and no output schema, this one-line description is far from complete. It omits expected return values, error behavior, callback semantics, parameter constraints, and any relationship to the status and title tools.

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 schema descriptions are mostly example values rather than semantic explanations, and the description adds no parameter detail. Parameter names like url, format, and quality are somewhat self-explanatory, but startTime, endTime, callbackUrl, and X-RapidAPI-User remain unclear.

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 tool converts YouTube videos to MP3 and is asynchronous, which is a specific action on a specific resource. It is distinguishable from the sibling tools 'status' and 'title', though it does not explicitly contrast with them.

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?

There is no guidance on when to use this tool versus alternatives like 'status' or 'title'. The description does not mention prerequisites, typical use cases, or when another tool would be more appropriate.

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