upload_file

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

No annotations are provided, so the description must carry the full behavioral disclosure burden. It merely states the action without explaining what happens to the file, whether it triggers change events, how existing content is handled, or what errors may occur. This is too opaque for a mutating operation.

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 a single, front-loaded sentence with no filler. It is concise and readable, but it is so short that it sacrifices helpfulness for brevity.

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 low complexity (2 required params, no output schema), a minimal description might suffice, but this one omits critical operational details like how to identify the target input, whether the file path must be absolute, and what behavior follows a successful upload. An agent would be uncertain about correct invocation.

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%, and the description does not explain the meaning or expected format of 'ref' or 'file_path.' The parameter names are somewhat self-explanatory, but the description adds no value beyond the raw schema, leaving ambiguity about how to reference the file input and what file path format is expected.

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 uses a clear verb-resource pair: 'Upload file to file input.' It specifies the action and the target, distinguishing it from other form-filling tools like fill or type_text. However, it could be more explicit about that it is setting an <input type=file> element rather than uploading to a server.

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 is provided on when to use this tool versus alternatives such as fill, paste_text, or evaluate. The context is implied only by the tool name and description; there are no mention of prerequisites (e.g., file existence, input visibility) or exclusions.

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