nex_browser_file_upload

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

With no annotations, the description carries the full behavioral burden and falls short: it never says whether the call waits for the upload to complete, what happens on failure or partial upload, or whether a change/input event is fired. The word 'approved' gestures at a security constraint without defining it, so an agent cannot tell which local paths are permitted.

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?

A single front-loaded sentence with no padding or redundancy. It is slightly under-specified rather than bloated, so conciseness is good but the sentence does very little work.

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 mutation-style tool with no annotations and no output schema, the description omits the behavior an agent most needs: completion semantics, error behavior, and the meaning of file approval. It is not complete enough to call the tool confidently.

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 75% and the schema already documents pageId, target and sessionId, so the baseline is 3. However the one undescribed parameter, 'files', is the most important one, and the description adds nothing about whether these are absolute paths, what 'approved' means, or any per-file constraints.

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?

Names a specific verb and resource ('Upload approved local files') plus the mechanism ('through a file input target'), so an agent can see it drives an <input type=file>. It does not distinguish itself from the sibling nex_browser_drop, which is the other file-delivery tool, leaving ambiguity about which to pick.

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 phrase 'through a file input target' implies the situation (a page element accepting file input) but never states when to use this over nex_browser_drop or what prerequisites exist. Usage is inferable rather than stated.

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