Mint a signed URL for uploading a file into an upload session.

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

The description repeats the title without adding details about side effects, authentication needs, or rate limits. Annotations are minimal, and the description fails to provide additional behavioral context beyond the generic action.

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?

Single sentence is concise, but it lacks structural elements like parameter hints or usage notes. The conciseness is at the expense of completeness.

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 role in an upload workflow (alongside siblings like 'initiate', 'complete'), the description does not situate it within that workflow. It does not mention the output schema or the expected flow, leaving the agent underinformed.

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%, yet the description adds no meaning to any parameter. It does not explain that upload_id comes from 'initiate', what file_name is used for, or the role of content_type and x-api-key.

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?

Tautological: description restates name/title.

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 or when not to use the tool. There is no mention of prerequisites (e.g., having an upload_id from 'initiate') or alternatives, leaving the agent without context for proper invocation.

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