switch_to_frame · MCP Selenium Server MCP: Risk & Policy

WHAT IT DOES

What switch_to_frame does on MCP Selenium Server

AI agents invoke switch_to_frame to trigger actions in MCP Selenium 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 switch_to_frame needs a policy

Switching to a frame/iframe changes the active browser context, affecting all subsequent operations. This is a browser action that executes a state change in the automation session. While not destructive on its own, misuse could redirect interactions to unintended frames, potentially causing unintended actions.

From the tool's definition 'switches to an iframe or frame on the page' — triggers a browser context switch that redirects subsequent browser automation actions into a potentially different execution context

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

switch_to_frame Rate-limited

switch_to_frame 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": {
    "switch_to_frame": {
      "limits": [
        {
          "counter": "switch_to_frame_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 MCP Selenium Server, so you can run agents against it safely.

FAQ

Questions about switch_to_frame

What does the switch_to_frame tool do? +

switches to an iframe or frame on the page. It is categorised as a Execute tool in the MCP Selenium 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 switch_to_frame? +

Register the MCP Selenium Server MCP server in PolicyLayer and add a rule for switch_to_frame: 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 MCP Selenium Server. Nothing to install.

What risk level is switch_to_frame? +

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

Can I rate-limit switch_to_frame? +

Yes. Add a rate_limit block to the switch_to_frame 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 switch_to_frame completely? +

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

switch_to_frame is provided by the MCP Selenium Server MCP server (sapangupta63/mcp-selenium-extended). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.