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

With no annotations, the description carries the transparency burden. It usefully discloses that the URL is fetched once and never persisted, which is non-obvious and valuable. However, it does not clarify whether confirming triggers an irreversible upload, what side effects occur, or what the tool returns.

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 filler. The core purpose is front-loaded, and the critical caveat about the exact URL being fetched once and never persisted earns its place.

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?

The description is adequate for a simple three-parameter confirm action, but it omits the return/result behavior and does not explicitly connect to the prepare workflow. Given no output schema and many sibling confirm/prepare pairs, an agent would benefit from knowing what happens after confirmation.

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%, so the description must compensate. It adds meaningful semantics for source_url ('exact prepared HTTPS URL must be supplied again; fetched once and never persisted') and gives context to draft_id via 'video upload draft'. Still, draft_id and the relationship between the three parameters remain largely implicit.

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 states the action ('Confirm') and the resource ('a reviewed video upload draft'), which distinguishes it from discovery or removal tools. It does not explicitly name a sibling such as video_upload_prepare or asset_upload_confirm, so differentiation is not quite as sharp as a full 5.

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?

The description gives clear context: the tool is used after a draft has been reviewed and prepared, and the exact prepared URL must be supplied again. It does not explicitly list when not to use it or name alternatives, but the reviewed/prepared framing strongly signals the intended workflow phase.

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