attach_debugger · Browser MCP Bridge MCP: Risk & Policy

WHAT IT DOES

What attach_debugger does on Browser MCP Bridge

AI agents invoke attach_debugger to trigger actions in Browser MCP Bridge. 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 attach_debugger needs a policy

Attaching a debugger is not a passive read; it establishes a privileged connection to a browser tab that enables code execution, DOM manipulation, network interception, and other powerful operations. Combined with sibling tools like execute_javascript, a debugger attachment dramatically expands the attack surface.

From the tool's definition 'Attach Chrome debugger to a tab for advanced inspection' — attaching a debugger is an active operation that connects a debugging interface to a live browser tab, enabling privileged control and inspection capabilities.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

attach_debugger Rate-limited

attach_debugger 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": {
    "attach_debugger": {
      "limits": [
        {
          "counter": "attach_debugger_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 Browser MCP Bridge, so you can run agents against it safely.

FAQ

Questions about attach_debugger

What does the attach_debugger tool do? +

Attach Chrome debugger to a tab for advanced inspection. It is categorised as a Execute tool in the Browser MCP Bridge MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on attach_debugger? +

Register the Browser MCP Bridge MCP server in PolicyLayer and add a rule for attach_debugger: 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 Browser MCP Bridge. Nothing to install.

What risk level is attach_debugger? +

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

Can I rate-limit attach_debugger? +

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

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

attach_debugger is provided by the Browser MCP Bridge MCP server (robhicks/browser-mcp-bridge). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.