browser_wait_for

THE RISK

High Risk

This tool executes a conditional wait operation that depends on runtime conditions (text presence/absence) and specified timing. While not destructive or financial, it performs active browser control and can affect the outcome of subsequent operations.

From the tool's definition "Wait for text to appear or disappear or a specified time to pass" - this triggers browser actions (waits/conditions) that affect execution flow and can interact with page state.

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

HOW TO CONTROL BROWSER_WAIT_FOR

PolicyLayer is an MCP gateway — it sits between your AI agents and Fast 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 Fast 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

More Fast Playwright MCP tools

Execute browser_batch_execute Execute multiple browser actions in sequence. PREFER over individual tools for 2+ operatio Execute browser_navigate Navigate to a URL Execute browser_navigate_back Go back to previous page Execute browser_navigate_forward Go forward to next page Execute browser_tab_new Open a new tab Execute browser_click Perform click on web page Execute browser_drag Perform drag and drop between two elements Execute browser_evaluate Evaluate JavaScript expression on page or element and return result

All 34 Fast Playwright MCP tools →

Execute tools on other servers

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Go deeper

High-risk tools in Fast 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.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

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 Fast 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 Fast 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 Fast 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 Fast Playwright MCP server (tontoko/fast-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 Fast Playwright MCP tool call.

Deterministic rules across all 34 Fast Playwright MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

GOVERN FAST PLAYWRIGHT →

Free to start. No card required.

34 Fast Playwright MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

// WHAT BROWSER_WAIT_FOR ON FAST PLAYWRIGHT MCP DOES

// THE RISK

// HOW TO CONTROL BROWSER_WAIT_FOR

// EXPLORE