refresh · Selenium MCP: Risk & Policy

WHAT IT DOES

What refresh does on SeleniumMCP

AI agents invoke refresh 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 refresh needs a policy

Refreshing a page is a browser action with potential side effects: it can re-execute JavaScript, resubmit POST requests, trigger network calls, or re-run any page-level automation. It falls under Execute as it triggers an external operation whose effects depend on the current page context. Severity is medium because misuse could cause repeated form submissions or unintended actions on the loaded page.

From the tool's definition 'Refresh the current page' — triggers a browser action that reloads the current page, potentially re-submitting forms, re-triggering scripts, or causing repeated external operations

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

refresh Rate-limited

refresh 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": {
    "refresh": {
      "limits": [
        {
          "counter": "refresh_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 refresh

What does the refresh tool do? +

Refresh the current page. 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 refresh? +

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

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

Can I rate-limit refresh? +

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

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

refresh 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.