browser_switch_frame · Selenium MCP: Risk & Policy

WHAT IT DOES

What browser_switch_frame does on Selenium

AI agents invoke browser_switch_frame to trigger actions in Selenium. 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_switch_frame needs a policy

Switching browser frames changes the active browsing context in a Selenium WebDriver session, enabling subsequent interactions within that frame. This is a browser execution action that modifies the state of the automated browser session.

From the tool's definition Switch to an iframe or back to main content

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

browser_switch_frame Rate-limited

browser_switch_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": {
    "browser_switch_frame": {
      "limits": [
        {
          "counter": "browser_switch_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 Selenium, so you can run agents against it safely.

FAQ

Questions about browser_switch_frame

What does the browser_switch_frame tool do? +

Switch to an iframe or back to main content. It is categorised as a Execute tool in the Selenium 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_switch_frame? +

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

What risk level is browser_switch_frame? +

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

Can I rate-limit browser_switch_frame? +

Yes. Add a rate_limit block to the browser_switch_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 browser_switch_frame completely? +

Set action: deny in the PolicyLayer policy for browser_switch_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 browser_switch_frame? +

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