browser_navigate_action · MCP Macaco Playwright MCP

WHAT IT DOES

What browser_navigate_action does on MCP Macaco Playwright

AI agents invoke browser_navigate_action 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_action needs a policy

Navigation actions in Playwright change browser state and load external resources—this is execution of external operations, not mere data retrieval (Read) or reversible creation (Write). The blast radius is high because a compromised agent could navigate to malicious sites, phishing pages, or trigger unintended workflows.

From the tool's definition Tool performs 'navigation actions' in a browser context, which triggers external operations (page loads, redirects, state changes) whose effects depend on the URL argument provided.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

browser_navigate_action Rate-limited

browser_navigate_action 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_action": {
      "limits": [
        {
          "counter": "browser_navigate_action_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_action

What does the browser_navigate_action tool do? +

Perform navigation actions using exact values:. 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_action? +

Register the MCP Macaco Playwright MCP server in PolicyLayer and add a rule for browser_navigate_action: 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_action? +

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

Can I rate-limit browser_navigate_action? +

Yes. Add a rate_limit block to the browser_navigate_action 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_action completely? +

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

browser_navigate_action 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.