open_page · Selenium MCP: Risk & Policy

WHAT IT DOES

What open_page does on Selenium

AI agents invoke open_page 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 open_page needs a policy

Opening/navigating to a URL triggers an external browser operation with side effects that depend on the argument — the URL could be a malicious site, trigger downloads, initiate OAuth flows, cause phishing, or interact with web services. It's an active browser action rather than a passive data read, and its effects depend entirely on the URL provided.

From the tool's definition Navigate the browser to a URL

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

open_page Rate-limited

open_page 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": {
    "open_page": {
      "limits": [
        {
          "counter": "open_page_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 open_page

What does the open_page tool do? +

Navigate the browser to a URL. 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 open_page? +

Register the Selenium MCP server in PolicyLayer and add a rule for open_page: 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 open_page? +

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

Can I rate-limit open_page? +

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

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

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