playwright_close · Playwright MCP Server MCP: Risk & Policy

WHAT IT DOES

What playwright_close does on Playwright MCP Server

AI agents invoke playwright_close to trigger actions in Playwright MCP Server. 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 playwright_close needs a policy

This tool terminates the browser process and releases all associated resources. While not destructive to data, it executes an operational action (closing the browser session) that could disrupt ongoing automation workflows, lose unsaved state, and terminate all active browser contexts. It is an external operation with side effects beyond simple data retrieval or modification.

From the tool's definition Close the browser and release all resources

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

playwright_close Rate-limited

playwright_close 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": {
    "playwright_close": {
      "limits": [
        {
          "counter": "playwright_close_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 Playwright MCP Server, so you can run agents against it safely.

FAQ

Questions about playwright_close

What does the playwright_close tool do? +

Close the browser and release all resources. It is categorised as a Execute tool in the Playwright MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on playwright_close? +

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

What risk level is playwright_close? +

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

Can I rate-limit playwright_close? +

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

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

playwright_close is provided by the Playwright MCP Server MCP server (vinothbhc1986/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.