page_wait_for_load_state · MCP Playwright Server MCP

WHAT IT DOES

What page_wait_for_load_state does on MCP Playwright Server

AI agents invoke page_wait_for_load_state to trigger actions in MCP Playwright 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 page_wait_for_load_state needs a policy

This tool executes a browser command (page.waitForLoadState in Playwright) that blocks execution until a condition is met. While not destructive or financially harmful, it represents an external operation whose timing and side effects depend on page state. A malicious agent could use this to synchronize attacks with page loads, exfiltrate data post-load, or create DoS conditions via extended waits.

From the tool's definition Tool triggers page load state waiting, which controls browser behavior and timing of subsequent operations. Description states it 'waits for' specific load states, which is an active browser control operation that affects execution flow.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

page_wait_for_load_state Rate-limited

page_wait_for_load_state 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": {
    "page_wait_for_load_state": {
      "limits": [
        {
          "counter": "page_wait_for_load_state_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 Playwright Server, so you can run agents against it safely.

FAQ

Questions about page_wait_for_load_state

What does the page_wait_for_load_state tool do? +

Wait for the page to reach a specific load state. Recommended: use domcontentloaded for SPAs, networkidle for pages with async data loading. It is categorised as a Execute tool in the MCP Playwright 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 page_wait_for_load_state? +

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

What risk level is page_wait_for_load_state? +

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

Can I rate-limit page_wait_for_load_state? +

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

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

page_wait_for_load_state is provided by the MCP Playwright Server MCP server (j0hanz/playwright-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.