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

Annotations already declare readOnlyHint=false, openWorldHint=true, idempotentHint=false and destructiveHint=false, so the safety profile is covered by structured data. The description adds nothing beyond that — it never says the job is asynchronous, that a task/workflow ID is returned, or that progress is polled via get_work_status, despite callback_id hinting at that model.

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?

At four characters the text is not concise, it is under-specified. There is no front-loaded statement of what the tool produces or how to invoke it, so brevity here costs the agent essential information.

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?

No output schema exists and the description supplies nothing about return values, task status handling, or async polling. Combined with only 33% parameter coverage and zero usage guidance, the definition is far too thin for a three-parameter media-processing tool with siblings like video_enhance_v2 and get_work_status.

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 only 33% (just callback_id), and video_url and workspace_id have no descriptions in either the schema or the description text. Nothing in the description explains accepted URL forms, video size/duration limits for upscaling, or how workspace_id scopes the job.

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?

"视频超分" (video super-resolution) does name the operation, but it essentially restates the tool name video_upscale as a noun phrase rather than stating a verb plus scope. It gives no differentiation from the close sibling video_enhance_v2, which plausibly also improves video quality, so an agent cannot tell the two apart from the description alone.

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 usage guidance of any kind: no when-to-use, no when-not-to-use, no mention of video_enhance_v2 as an alternative, and no prerequisites. The agent is left to guess from the name alone.

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