playwright_upload_file · Playwright MCP Server MCP

WHAT IT DOES

What playwright_upload_file does on Playwright MCP Server

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

WHY IT NEEDS A POLICY

Why playwright_upload_file needs a policy

This tool uploads files to web forms via browser automation, which creates or modifies data on target systems (files are written/submitted). It is Write rather than Execute because the tool itself doesn't run arbitrary code—it only performs a file submission action. However, if the uploaded file is later processed unsafely by the server, damage could escalate.

From the tool's definition Tool name 'playwright_upload_file' and description 'Upload a file to an input[type=' indicate file upload functionality to web form inputs. The description is incomplete but the name clearly shows file write/submission intent.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

playwright_upload_file Rate-limited

playwright_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": {
    "playwright_upload_file": {
      "limits": [
        {
          "counter": "playwright_upload_file_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about playwright_upload_file

What does the playwright_upload_file tool do? +

Upload a file to an input[type=. It is categorised as a Write tool in the Playwright MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on playwright_upload_file? +

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

What risk level is playwright_upload_file? +

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

Can I rate-limit playwright_upload_file? +

Yes. Add a rate_limit block to the playwright_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 playwright_upload_file completely? +

Set action: deny in the PolicyLayer policy for playwright_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 playwright_upload_file? +

playwright_upload_file is provided by the Playwright MCP Server MCP server (vinothbhc1986/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.