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

With no annotations provided, the description carries the burden of disclosing behavior. It mentions billing per call (1 credit) and groups the tool under 'Specific video Info', but does not explicitly state that it is a read-only operation or describe the output format beyond implying a string. The billing note adds value, but deeper behavioral details are absent.

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 concise, with a single sentence stating the core function followed by compact metadata (group and billing). There is no redundant filler, and the most important information is front-loaded.

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 getter with one parameter and no output schema, the description is adequately complete: it states the output type (string), the input parameter is well-documented in the schema, and billing is disclosed. It lacks details on error conditions or return value formatting, but these are not critical for this straightforward tool.

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 already provides 100% documentation for the single parameter 'id', including an example and a regex pattern. The description adds no additional parameter context, so the baseline score of 3 applies according to the high schema coverage.

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 identifies the tool's function: retrieving the YouTube video category for a given video. It distinguishes itself from sibling tools (get_info_title, get_info_duration, etc.) by specifying the exact field it returns, making its purpose unambiguous.

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 tool's placement in the 'Specific video Info' group and its title make the use case evident: use it when you need the category of a YouTube video. While no explicit exclusions or alternatives are mentioned, the context is clear given the sibling tools are all dedicated to individual video attributes.

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