selenium_navigate · MCP Developer Server MCP: Risk & Policy

WHAT IT DOES

What selenium_navigate does on MCP Developer Server

AI agents invoke selenium_navigate to trigger actions in MCP Developer 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 selenium_navigate needs a policy

Selenium navigation is an Execute operation because it runs browser commands whose effects depend entirely on the URL argument. While navigation itself is not destructive, it can trigger external operations, load malicious content, interact with live services, or initiate unintended workflows.

From the tool's definition Tool 'selenium_navigate' performs 'Navigate to a URL using Selenium' — this executes a browser automation action that interacts with external web services and can trigger arbitrary side effects depending on the target URL.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

selenium_navigate Rate-limited

selenium_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": {
    "selenium_navigate": {
      "limits": [
        {
          "counter": "selenium_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 MCP Developer Server, so you can run agents against it safely.

FAQ

Questions about selenium_navigate

What does the selenium_navigate tool do? +

Navigate to a URL using Selenium. It is categorised as a Execute tool in the MCP Developer 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 selenium_navigate? +

Register the MCP Developer Server MCP server in PolicyLayer and add a rule for selenium_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 MCP Developer Server. Nothing to install.

What risk level is selenium_navigate? +

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

Can I rate-limit selenium_navigate? +

Yes. Add a rate_limit block to the selenium_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 selenium_navigate completely? +

Set action: deny in the PolicyLayer policy for selenium_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 selenium_navigate? +

selenium_navigate is provided by the MCP Developer Server MCP server (ra86-dev/mcpdockershell). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.