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. The description adds nothing beyond that: it does not say whether this is an async job, that a task/callback flow is expected (despite callback_id and the get_work_status siblings), or what happens to the source video.

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?

It is a single short phrase with no wasted words, but it is under-specified rather than genuinely concise. There is no front-loaded scope, constraints, or output expectation.

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?

A video mutation tool with no output schema, no annotation-derived behavioral detail in the description, a 0-required-parameter schema, and a webhook/callback flow hinted at only by the schema field. An agent cannot determine inputs, job lifecycle, or how to retrieve results from this definition.

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 coverage is only 33% – only callback_id is documented in the schema, and video_url and workspace_id (including why 0 params are required) are unexplained anywhere. The one-line description provides zero parameter meaning to compensate for this gap.

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 phrase "视频水印消除" names a specific verb+resource (remove watermarks from video), which is distinct from siblings like video_magic_eraser or video_subtitle. It is clear about what the tool does, but offers no explicit contrast with the other video-editing siblings.

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 when-to-use guidance, no prerequisites, and no named alternative. An agent must infer from the name alone that this is the watermark-removal option among many video tools.

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