cloak_console · CloakBrowser MCP Server MCP: Risk & Policy

WHAT IT DOES

What cloak_console does on CloakBrowser MCP Server

AI agents invoke cloak_console to trigger actions in CloakBrowser MCP 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 cloak_console needs a policy

While the tool can passively read console output (Read), its ability to evaluate JavaScript expressions makes it Execute. Arbitrary JS execution in a browser context can perform any action - DOM manipulation, network requests, data exfiltration, or triggering other browser APIs - making it high severity if misused.

From the tool's definition 'evaluate JavaScript expression' - this tool can run arbitrary JavaScript in the browser context

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cloak_console Rate-limited

cloak_console 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": {
    "cloak_console": {
      "limits": [
        {
          "counter": "cloak_console_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 CloakBrowser MCP Server, so you can run agents against it safely.

FAQ

Questions about cloak_console

What does the cloak_console tool do? +

Get browser console output or evaluate JavaScript expression. It is categorised as a Execute tool in the CloakBrowser MCP 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 cloak_console? +

Register the CloakBrowser MCP Server MCP server in PolicyLayer and add a rule for cloak_console: 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 CloakBrowser MCP Server. Nothing to install.

What risk level is cloak_console? +

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

Can I rate-limit cloak_console? +

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

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

cloak_console is provided by the CloakBrowser MCP Server MCP server (miwoomiwoo/cloakbrowser-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.