browser_create_session · MCProxy MCP: Risk & Policy

WHAT IT DOES

What browser_create_session does on MCProxy

AI agents invoke browser_create_session to trigger actions in MCProxy. 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_create_session needs a policy

This tool initiates a remote browser session on geographically distributed infrastructure. It triggers an external operation (spinning up a headless browser on SaladCloud containers) whose effects depend on arguments like location and browser engine.

From the tool's definition Create a new remote browser session... establish sessions in specific geographic locations with different browser engines. Supports mobile device emulation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

browser_create_session Rate-limited

browser_create_session 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_create_session": {
      "limits": [
        {
          "counter": "browser_create_session_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 MCProxy, so you can run agents against it safely.

FAQ

Questions about browser_create_session

What does the browser_create_session tool do? +

Create a new remote browser session. Returns session_id, browser type, and location info (IP, city, region, country, timezone, ISP) of the browser server. Use this to establish sessions in specific geographic locations with different browser engines. Supports mobile device emulation. It is categorised as a Execute tool in the MCProxy 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_create_session? +

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

What risk level is browser_create_session? +

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

Can I rate-limit browser_create_session? +

Yes. Add a rate_limit block to the browser_create_session 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_create_session completely? +

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

browser_create_session is provided by the MCProxy MCP server (saladtechnologies/mcproxy). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.