cloak_navigate · CloakBrowser MCP Server MCP: Risk & Policy

WHAT IT DOES

What cloak_navigate does on CloakBrowser MCP Server

AI agents invoke cloak_navigate 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_navigate needs a policy

Navigation is an Execute action—it triggers external operations (HTTP requests, page loads) whose effects depend on the URL argument and cannot be treated as a pure read. While it returns data, the primary purpose is to execute a navigation command in a real browser, potentially visiting arbitrary URLs and initiating downstream effects.

From the tool's definition Tool name 'cloak_navigate' combined with description 'Navigate to a URL and return a compact snapshot of the page' indicates execution of navigation actions.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cloak_navigate Rate-limited

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

FAQ

Questions about cloak_navigate

What does the cloak_navigate tool do? +

Navigate to a URL and return a compact snapshot of the page. 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_navigate? +

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

What risk level is cloak_navigate? +

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

Can I rate-limit cloak_navigate? +

Yes. Add a rate_limit block to the cloak_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 cloak_navigate completely? +

Set action: deny in the PolicyLayer policy for cloak_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 cloak_navigate? +

cloak_navigate 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.