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

The annotations already declare that this is not read-only, not idempotent, not destructive, and not open-world. The description adds useful behavioral context beyond the annotations: the page works once and expires after 30 minutes, and get_upload_result reports when the file has arrived.

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?

The description is two sentences, front-loaded with the core action and followed by the expiry constraint and the related result-checking tool. Every sentence adds useful information without unnecessary wording.

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 zero-parameter tool with no output schema, the description covers the essential behavior: what is created, how long it lasts, and how to check the result. It could be slightly more complete by explicitly stating that the tool returns the upload link itself, but the overall context is sufficient.

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?

This tool has zero parameters, so there are no parameter semantics to explain. The baseline score of 4 applies because the description does not need to compensate for an input schema.

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 states a specific action and resource: it creates a one-time page where someone can send a photo or video from their own device. It also names the sibling tool get_upload_result and explains its role, so the agent can distinguish this tool from the result-checking tool.

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 makes clear when to use this tool: to obtain a one-time upload page for a person to send media from their own device. It also points to get_upload_result for checking arrival, but it does not explicitly compare against alternatives such as import_media_from_link or state when not to use this tool.

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