AI agents use playwright_upload_file to create or update resources in RunAutomation MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your RunAutomation MCP Server environment.
This tool uploads files to web applications, which is a write operation that creates or modifies data. It does not delete data (ruling out Destructive), does not move money (ruling out Financial), and does not execute arbitrary code on the system (though it does trigger browser actions, the upload itself is fundamentally a write operation).
From the tool's definition Tool name 'playwright_upload_file' and description 'Upload a file to an input[type=' indicate file upload functionality through browser automation, creating new data in web forms.
Documented attack patterns abuse exactly the kind of access playwright_upload_file gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and RunAutomation MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for playwright_upload_file:
{
"version": "1",
"default": "deny",
"tools": {
"playwright_upload_file": {
"limits": [
{
"counter": "playwright_upload_file_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}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.
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Upload a file to an input[type=. It is categorised as a Write tool in the RunAutomation MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the RunAutomation 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 RunAutomation MCP Server. Nothing to install.
playwright_upload_file is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
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.
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.
playwright_upload_file is provided by the RunAutomation MCP Server MCP server (tayyabakmal1/runautomation-mcpserver). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from RunAutomation MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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91 RunAutomation MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.