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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world). The description adds genuinely useful context beyond that: the link expires after 10 minutes, the file is MP4 with a readable filename, and free-trial videos carry a HypeFox watermark. It stops short of saying what happens when the video is not yet ready.

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?

Two short sentences with no waste, and the most decision-relevant facts (format and expiry) are 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 read-only tool with no output schema, the description adequately conveys what comes back and how long it's valid. It is missing the readiness prerequisite for the video and any error behavior, which are the main things an agent could get wrong here.

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 0% and the single video_id parameter is undocumented in both schema and description. The description never explains what video_id refers to, where it comes from, or what form it takes, so it fails to compensate for the coverage 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 description clearly identifies the resource (an MP4 download link for a video file) and its format, which distinguishes it from siblings like get_video or preview_video_edit. However, it is phrased as a noun phrase describing the return value rather than stating the action, and it doesn't explicitly name the sibling it differs from.

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 statement of when to use this tool versus alternatives such as get_video, preview_video_edit, or list_videos. The prerequisite that the video must be approved/ready appears only in the title, not the description, so an agent gets no explicit guidance on preconditions or call ordering.

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