browser_upload_file

Prepare a Playwright file-upload action for a LocalAnt Video Studio output file.

SERVERLocalAnt SOURCEyuga-hashimoto/localant

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/yuga-hashimoto-localant/browser-upload-file.md

WHAT IT DOES

What browser_upload_file does on LocalAnt

AI agents use browser_upload_file to create or update resources in LocalAnt, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your LocalAnt environment.

RISK

Why browser_upload_file is rated Medium

This tool creates or modifies data on a remote system (uploads a file) through browser automation, which is reversible and therefore categorizes as Write rather than Execute. While browser automation is involved, the core action is data transfer/creation rather than arbitrary code execution.

From the tool's definition Tool name 'browser_upload_file' and description 'Prepare a Playwright file-upload action for a LocalAnt Video Studio output file' indicate it uploads/transfers file data to a web form or service.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs browser_upload_file safely

PolicyLayer is an MCP gateway: it sits between your AI agents and LocalAnt, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For browser_upload_file, this is the rule to start with:

browser_upload_file Rate-limited

browser_upload_file stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "browser_upload_file": {
      "limits": [
        {
          "counter": "browser_upload_file_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect LocalAnt, apply this rule, and every browser_upload_file call is checked against it from then on.

FAQ

Questions about browser_upload_file

What does the browser_upload_file tool do? +

Prepare a Playwright file-upload action for a LocalAnt Video Studio output file. It is categorised as a Write tool in the LocalAnt MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on browser_upload_file? +

Register the LocalAnt MCP server in PolicyLayer and add a rule for browser_upload_file: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches LocalAnt. Nothing to install.

What risk level is browser_upload_file? +

browser_upload_file is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit browser_upload_file? +

Yes. Add a rate_limit block to the browser_upload_file rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block browser_upload_file completely? +

Set action: deny in the PolicyLayer policy for browser_upload_file. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides browser_upload_file? +

browser_upload_file is provided by the LocalAnt MCP server (yuga-hashimoto/localant). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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