navigate · Selenium MCP: Risk & Policy

WHAT IT DOES

What navigate does on SeleniumMCP

AI agents invoke navigate to trigger actions in SeleniumMCP. 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 navigate needs a policy

Navigation constitutes execution of external operations through the browser. While not destructive or financial by itself, it can trigger arbitrary code execution on the loaded page, load malicious content, or perform side effects depending on the URL. The argument-dependent nature and external operation trigger classify it as Execute rather than Read.

From the tool's definition Tool description states 'Navigate the browser to an http, https, or allowed file URL'. Navigation is a browser action that triggers external operations (network requests, page loads, JavaScript execution) whose effects depend on the URL argument provided.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

navigate Rate-limited

navigate 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": {
    "navigate": {
      "limits": [
        {
          "counter": "navigate_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 SeleniumMCP, so you can run agents against it safely.

FAQ

Questions about navigate

What does the navigate tool do? +

Navigate the browser to an http, https, or allowed file URL. It is categorised as a Execute tool in the SeleniumMCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on navigate? +

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

What risk level is navigate? +

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

Can I rate-limit navigate? +

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

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

navigate is provided by the Selenium MCP server (lokii0911/seleniummcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.