browser_navigate_back · Wmux MCP: Risk & Policy

WHAT IT DOES

What browser_navigate_back does on Wmux

AI agents invoke browser_navigate_back to trigger actions in Wmux. 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_navigate_back needs a policy

This tool executes a browser navigation command whose effects depend on browsing history state. While not destructive or financial, it is an active operation that changes application state and could be misused to navigate to unintended pages, trigger unwanted actions, or manipulate user workflows.

From the tool's definition Tool performs browser navigation action ("Go back in browser history") which executes a state-changing operation on an external system (browser).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

browser_navigate_back Rate-limited

browser_navigate_back 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_navigate_back": {
      "limits": [
        {
          "counter": "browser_navigate_back_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 Wmux, so you can run agents against it safely.

FAQ

Questions about browser_navigate_back

What does the browser_navigate_back tool do? +

Go back in browser history. Returns the current URL after going back. It is categorised as a Execute tool in the Wmux 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_navigate_back? +

Register the Wmux MCP server in PolicyLayer and add a rule for browser_navigate_back: 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 Wmux. Nothing to install.

What risk level is browser_navigate_back? +

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

Can I rate-limit browser_navigate_back? +

Yes. Add a rate_limit block to the browser_navigate_back 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_navigate_back completely? +

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

browser_navigate_back is provided by the Wmux MCP server (openwong2kim/wmux). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

// THE FULL RECORD

browser_navigate_back is one line of Wmux's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

Teams ship this data inside their own products. See what a licence covers →