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

Adds real behavioral context beyond the annotations: the URL is single use, expires in 15 minutes, and bypasses panel size limits. Given destructiveHint=true, it would be stronger if it said what happens to an existing file with the same name in `path` (overwrite vs. fail), which is the main behavior an agent needs to warn about.

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?

Four tight sentences, front-loaded with purpose, then mechanics, then lifetime, then a pairing tip. No filler and nothing repeated from the title.

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?

Covers the URL lifecycle, the POST mechanics, and destination behavior, which is most of what a 2-parameter upload tool needs. The unexplained required `id` and the overwrite semantics left implicit by destructiveHint=true keep it from being complete.

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?

The required `id` parameter is never explained in either schema or description, so the description only covers one of two parameters alongside a 50% schema coverage. It does reinforce the `path` meaning ('each lands in `path` under its own file name'), which adds a little beyond the schema's own note that it defaults to the volume root.

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 and resource ('Get a one-time signed URL to upload files straight to the node') with a scope qualifier ('no size cap from the panel') that separates it from files_downloadUrl and from in-panel write tools like files_write.

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?

Tells the agent exactly how to use the result ('POST a multipart form with one or more `files` parts') and names a follow-up tool ('Pair with files.decompress to unpack an archive'). It lacks an explicit when-not or an alternative upload path if a link cannot be obtained, so it stops short of full routing guidance.

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