browser_handle_dialog

THE RISK

High Risk

Why browser_handle_dialog needs a policy

This tool triggers browser UI interactions by accepting or dismissing dialogs, which constitutes executing browser actions. The effect depends on the dialog context — accepting a confirmation dialog could trigger irreversible operations (e.g., deletions, form submissions), but the tool itself is a browser action executor rather than inherently destructive.

From the tool's definition Accept or dismiss the currently open alert/confirm/prompt dialog in the active tab

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

POLICY

How to control browser_handle_dialog

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

policy.json

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

browser_handle_dialog 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 YetiBrowser 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

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Go deeper

High-risk tools in YetiBrowser 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_handle_dialog

What does the browser_handle_dialog tool do? +

Accept or dismiss the currently open alert/confirm/prompt dialog in the active tab. It is categorised as a Execute tool in the YetiBrowser 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_handle_dialog? +

Register the YetiBrowser MCP server in PolicyLayer and add a rule for browser_handle_dialog: 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 YetiBrowser MCP. Nothing to install.

What risk level is browser_handle_dialog? +

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

Can I rate-limit browser_handle_dialog? +

Yes. Add a rate_limit block to the browser_handle_dialog 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_handle_dialog completely? +

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

browser_handle_dialog is provided by the YetiBrowser MCP server (yetidevworks/yetibrowser-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every YetiBrowser MCP tool call.

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

CHECK YOUR STACK →