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

Annotations only declare the safety profile (not read-only, not idempotent, not destructive, closed-world); the description adds the operational detail that matters: it returns upload_page plus video_url, the page requires Google/email sign-in, agents may PUT to upload_url only when present, and the agent must wait for user confirmation before scoring. This is substantial context beyond structured fields.

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?

Front-loads the trigger condition and keeps every sentence tied to a real failure mode (don't paste terminal commands, don't send YouTube links, wait for completion). It is longer and more conversational than necessary, with some redundancy between the upload-link and skip instructions, but little is truly 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?

No output schema exists, and the description compensates by naming the returned artifacts (upload_page, video_url, upload_url) and the auth prerequisite. For a one-parameter link-generation tool, an agent has everything needed to call it and to handle the follow-up step correctly.

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?

Only one parameter and schema description coverage is 100% ('their file's name, for the link'), so the schema already carries the semantics. The description adds no format or constraint detail about filename, so the baseline of 3 applies.

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 action (create an upload link for a video the user has locally) and the exact trigger condition ('video is ON THEIR COMPUTER rather than at a link'). It explicitly separates itself from sibling score_my_video and from the cases where score_my_video should be called directly, so an agent can route without opening either schema.

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?

Gives explicit when-to-use (local file, no direct URL), when-not-to-use (direct video-file URL, Dropbox/Google Drive share links, YouTube/Vimeo/Dailymotion/Twitch), and the alternative to call in each case (score_my_video). It even sequences the follow-up call and the condition for the agent-PUT path.

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