browser_upload_file · Daytona Playwright MCP Server MCP

WHAT IT DOES

What browser_upload_file does on Daytona Playwright MCP Server

AI agents invoke browser_upload_file to trigger actions in Daytona Playwright MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why browser_upload_file needs a policy

Based on the tool name and server context, this tool likely triggers a file upload action in a browser — an external operation that sends data to remote servers. This is an Execute-category action (browser interaction with external side effects). The empty description lowers confidence, but the naming pattern and sibling tools (browser_click, browser_evaluate, etc.) confirm this is a browser automation action.

From the tool's definition Tool name 'browser_upload_file' on a server that controls a full Chrome browser in a cloud sandbox. Description is empty.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

browser_upload_file Rate-limited

browser_upload_file stays usable, but rate-capped — a runaway agent can't fire it dozens of times 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": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Daytona Playwright MCP Server, so you can run agents against it safely.

FAQ

Questions about browser_upload_file

What does the browser_upload_file tool do? +

browser_upload_file. It is categorised as a Execute tool in the Daytona Playwright MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on browser_upload_file? +

Register the Daytona Playwright MCP Server 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 Daytona Playwright MCP Server. Nothing to install.

What risk level is browser_upload_file? +

browser_upload_file is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

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 Daytona Playwright MCP Server MCP server (jamesmurdza/playwright-daytona-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.