files_get_upload_url_external

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

With no annotations provided, the description must fully convey behavioral traits. It does not disclose that the URL is temporary, any authentication requirements, or what happens if the upload is not completed. The tool's side effects (e.g., pending upload state) are omitted.

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 concise (one sentence) and front-loaded, but it lacks important context. Every word should earn its place; here, the brevity results in missing crucial workflow information. It is neither overly verbose nor sufficiently informative.

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?

Given the tool's complexity (4 parameters, required subsequent steps, output schema exists), the description is incomplete. It does not mention the workflow involving files_complete_upload_external, nor does it explain the output schema contents. The agent lacks necessary context to use the tool correctly.

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 coverage is 100%, so the baseline is 3. The description adds no additional meaning beyond the schema; it does not explain why parameters like 'length' are important or how they affect the generated URL. No extra value is provided.

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 tool returns an upload URL for an external file. It specifies the verb 'Get' and the resource 'upload URL for an external file'. However, it does not differentiate from sibling tools like files_upload or files_complete_upload_external, which could cause confusion.

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?

No guidance on when to use this tool versus alternatives. The description fails to mention that after obtaining the URL, the agent must upload the file and then call files_complete_upload_external to finalize. There is no indication of prerequisites or 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.