browser_file_upload

A execute tool on the Playwright MCP server.

SERVERPlaywright MCP SOURCEalialobidm/playwright-mcp

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/alialobidm-playwright-mcp/browser-file-upload.md

WHAT IT DOES

What browser_file_upload does on Playwright MCP

AI agents invoke browser_file_upload to trigger actions in Playwright MCP. 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.

RISK

Why browser_file_upload is rated High

Based on the tool name, this likely triggers a file upload action in a browser context — sending local files to a remote web service. This constitutes an external operation with real-world side effects (uploading potentially sensitive files to arbitrary destinations). It falls under Execute as it triggers an external browser operation. Severity is high because misuse could exfiltrate local files.

From the tool's definition Tool name 'browser_file_upload' on a Playwright browser automation server; description is empty and uninformative.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs browser_file_upload safely

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

browser_file_upload Rate-limited

browser_file_upload 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_file_upload": {
      "limits": [
        {
          "counter": "browser_file_upload_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about browser_file_upload

What does the browser_file_upload tool do? +

browser_file_upload is a execute tool on the Playwright MCP server. It is categorised as a Execute tool in the Playwright MCP 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_file_upload? +

Register the Playwright MCP server in PolicyLayer and add a rule for browser_file_upload: 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 Playwright MCP. Nothing to install.

What risk level is browser_file_upload? +

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

Can I rate-limit browser_file_upload? +

Yes. Add a rate_limit block to the browser_file_upload 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_file_upload completely? +

Set action: deny in the PolicyLayer policy for browser_file_upload. 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_file_upload? +

browser_file_upload is provided by the Playwright MCP server (alialobidm/playwright-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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