upload_file_url

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

With no annotations, the description carries the full burden of disclosure. It mentions the return value (Ed CDN URL) and the 'without downloading locally' behavior, but it does not disclose potential requirements (e.g., public URL accessibility, size limits) or side effects beyond the upload itself. This is adequate but not rich.

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 plus a single parameter explanation. Every sentence adds value, and the purpose, return value, and parameter are covered without any fluff.

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 simple one-parameter tool with an output schema, the description covers the action, the input, and the return value. It does not address error conditions or limitations, but given the tool's simplicity, the information is largely complete. Minor gaps prevent a perfect score.

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 schema provides only the parameter name 'url' with no description. The description adds meaning by explaining it as 'Public URL of the file to upload' and gives examples ('e.g. an image or document URL from the web'), exceeding what the schema alone offers.

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 specific action: 'Upload a file from a URL directly to Ed Discussion without downloading it locally first.' It identifies the resource (Ed Discussion), the verb (upload), and the source (URL), distinguishing it from sibling tools like upload_file (likely local upload).

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 implies when to use this tool by specifying 'from a URL' and 'without downloading it locally first,' which contrasts with a local upload approach. However, it does not explicitly name alternatives or state exclusions, so it stops short of a full 5.

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