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

Goes beyond the readOnlyHint/openWorldHint annotations by disclosing the URL lifetime (1 hour) and the completed-job precondition — both are operationally important. It omits failure behavior when the job isn't complete or the URL has expired.

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?

One sentence, front-loaded with the verb and outcome, with the two key constraints (1-hour expiry, completed job) packed in without waste.

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?

With no output schema, the description correctly explains what is returned (an MP4 download URL) and its expiry. Only error/edge-case behavior for incomplete jobs is left unstated, which is minor for a one-parameter read tool.

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% for the single job_id parameter, so the description carries the burden. Phrasing implies job_id identifies the job whose MP4 is wanted, but it adds no format, source, or how-to-obtain detail.

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 verb ('Get') and resource ('download URL for the finished MP4 of a completed job'), which is clearly distinct from the job-status siblings like get_caption_job. It stops short of explicitly contrasting itself with those 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?

'of a completed job' implies a precondition on job state, which is useful selection guidance. However, it never names an alternative (e.g., check get_caption_job to confirm completion) or states what to do when the job isn't finished.

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