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upload_file_by_uid

Upload a local file to a file input element on a Zen Browser page using its UID and file path.

Instructions

Upload file to file input by UID.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
uidYesFile input UID from snapshot
filePathYesLocal file path
Behavior2/5

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

No annotations provided, and the description does not disclose behavioral traits like whether the upload is synchronous, what happens if the file doesn't exist, or if any events are triggered. The minimal description carries the full burden but adds little insight.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single sentence that conveys the core action efficiently. It could be slightly more informative without being verbose, but it is concise and front-loaded.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the lack of annotations, output schema, and the tool's action (file upload), the description is incomplete. It does not cover error cases, prerequisites (e.g., file existence), or return value, leaving the agent underinformed.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% with clear parameter descriptions. The description adds no additional meaning beyond what the schema already provides, so the baseline score of 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description 'Upload file to file input by UID' clearly states the action (upload), resource (file), and target (file input by UID). It distinguishes from sibling tools like 'fill_by_uid' which are for text inputs.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

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 such as 'fill_by_uid' or other interaction tools. The description lacks context for tool selection.

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

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