tabs · Wraith MCP: Risk & Policy

WHAT IT DOES

What tabs does on Wraith

AI agents invoke tabs to trigger actions in Wraith. 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 tabs needs a policy

Managing browser tabs is a browser action that can open new tabs, close tabs, or switch focus. This falls under Execute as it triggers external browser operations whose effects depend on arguments. The severity is medium since tab management within a stealth browser could be used to navigate to arbitrary URLs or manipulate session state, but is not inherently destructive or financial.

From the tool's definition 'Manage browser tabs within a persistent session' — triggers browser actions (opening, closing, switching tabs) within an active browser session

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

tabs Rate-limited

tabs 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": {
    "tabs": {
      "limits": [
        {
          "counter": "tabs_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 Wraith, so you can run agents against it safely.

FAQ

Questions about tabs

What does the tabs tool do? +

Manage browser tabs within a persistent session. It is categorised as a Execute tool in the Wraith MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on tabs? +

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

What risk level is tabs? +

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

Can I rate-limit tabs? +

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

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

tabs is provided by the Wraith MCP server (koreahwan/wraith-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.