browser_navigate_url · MCP Macaco Playwright MCP

WHAT IT DOES

What browser_navigate_url does on MCP Macaco Playwright

AI agents invoke browser_navigate_url to trigger actions in MCP Macaco Playwright. 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_navigate_url needs a policy

Navigation is an Execute action because it causes the browser to perform an operation (HTTP request, page load) whose side effects depend on the supplied URL. An AI agent given this tool could navigate to malicious sites, trigger server-side actions via URLs with side effects, or chain with other browser tools for harmful workflows.

From the tool's definition 'Navigate to a URL' - this tool executes browser navigation actions which are external operations whose effects depend on the URL argument provided.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

browser_navigate_url Rate-limited

browser_navigate_url 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_navigate_url": {
      "limits": [
        {
          "counter": "browser_navigate_url_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 MCP Macaco Playwright, so you can run agents against it safely.

FAQ

Questions about browser_navigate_url

What does the browser_navigate_url tool do? +

Navigate to a URL. It is categorised as a Execute tool in the MCP Macaco Playwright 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_navigate_url? +

Register the MCP Macaco Playwright MCP server in PolicyLayer and add a rule for browser_navigate_url: 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 MCP Macaco Playwright. Nothing to install.

What risk level is browser_navigate_url? +

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

Can I rate-limit browser_navigate_url? +

Yes. Add a rate_limit block to the browser_navigate_url 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_navigate_url completely? +

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

browser_navigate_url is provided by the MCP Macaco Playwright MCP server (macacoai/mcp-playwright). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.