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

Annotations already establish read-only, idempotent, non-destructive semantics, so the bar is lower; the description still adds real value by disclosing the 45-second ceiling, the early-return behavior, and that the call costs nothing. It does not describe what a still-running job returns versus a finished one, but the core behavioral traits are covered.

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 tight sentences with the key constraint (45s) front-loaded and the early-return rule immediately following. Slightly oblique phrasing ("as ugcfans_get_job does") and the trailing "Free." cost it a perfect score but nothing is wasted.

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 two-parameter polling tool with no output schema and full annotation coverage, the description supplies everything needed to invoke it correctly: the wait bound, the early-return semantics, and the equivalence to get_job's report. The only gap is not spelling out the shape of a still-running result, which is minor given the get_job reference.

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?

Schema description coverage is 100%, so both parameters (job id and seconds) are already documented with type, range and default. The description echoes the 45-second cap and default but adds no format or edge-case detail beyond the schema, so it sits at the baseline.

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+resource (wait for a job) and scopes the behavior precisely: waits up to 45 seconds, returns early when the job ends. It explicitly differentiates itself from the sibling it most resembles, ugcfans_get_job, by framing the result as equivalent to that tool's output.

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?

Clearly conveys the context of use — blocking wait with a 45s cap that returns as soon as the job finishes — which implicitly tells the agent to prefer this over repeated get_job polling. It notes the tool is free, but there is no explicit when-not-to-use or named alternative to wait_job.

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