browser_wait_for

THE RISK

High Risk

Why browser_wait_for needs a policy

This tool executes browser automation logic that waits for conditions and can proceed with subsequent actions based on text appearance/disappearance or elapsed time. While it doesn't directly perform destructive operations, it is part of a browser automation suite (alongside click, drag, evaluate, fill_form, etc.) where the tool enables conditional execution flows.

From the tool's definition Tool performs browser automation that triggers external operations: 'Wait for text to appear or disappear or a specified time to pass' - this actively monitors and responds to browser state changes, which is a form of control flow execution in a browser…

Documented attack patterns abuse exactly the kind of access browser_wait_for gives an agent:

POLICY

How to control browser_wait_for

PolicyLayer is an MCP gateway — it sits between your AI agents and Better Playwright MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for browser_wait_for:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "browser_wait_for": {
      "limits": [
        {
          "counter": "browser_wait_for_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

browser_wait_for 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.

Create a free account and register Better Playwright MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Better Playwright MCP tools

Destructive browser_close Close the page Execute browser_navigate Navigate to a URL Execute browser_navigate_back Go back to the previous page Execute browser_click Perform click on a web page Execute browser_drag Perform drag and drop between two elements Execute browser_evaluate Evaluate JavaScript expression on page or element Execute browser_fill_form Fill multiple form fields Execute browser_handle_dialog Handle a dialog

All 29 Better Playwright MCP tools →

Execute tools on other servers

Android Forensics ADB MCP Server adb_shell_command EMBA-MCP run_emba_scan Frida Game Hacking MCP remove_breakpoint Procmon request_elevation

Go deeper

High-risk tools in Better Playwright MCP → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about browser_wait_for

What does the browser_wait_for tool do? +

Wait for text to appear or disappear or a specified time to pass. It is categorised as a Execute tool in the Better Playwright MCP 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_wait_for? +

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

What risk level is browser_wait_for? +

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

Can I rate-limit browser_wait_for? +

Yes. Add a rate_limit block to the browser_wait_for 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_wait_for completely? +

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

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

Enforce policy on every Better Playwright MCP tool call.

Start from Better Playwright MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →