browser_select_option

THE RISK

High Risk

Why browser_select_option needs a policy

This tool performs a browser automation action (selecting a dropdown option) in a live browser session. It executes an interaction that can trigger form changes, navigation, or other side effects depending on the page context. It goes beyond reading data and constitutes an active browser operation, placing it in the Execute category.

From the tool's definition Select an option in a dropdown — triggers browser interaction/automation in an active Chrome tab

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

POLICY

How to control browser_select_option

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_select_option:

policy.json

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

browser_select_option 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

Related tools and policies

More YetiBrowser MCP tools

Execute browser_evaluate Run custom JavaScript inside the page context and return the JSON-serializable result. Execute browser_wait Wait for a specified time in seconds Execute browser_wait_for Wait until a selector appears (optionally visible) before continuing. Returns a fresh snap Execute browser_click Perform click on a web page Execute browser_drag Drag an element (like cards in a kanban board) onto a target element. Useful for sortable Execute browser_fill_form Fill multiple form fields in a single call. Supports inputs, textareas, selects, checkboxe Execute browser_handle_dialog Accept or dismiss the currently open alert/confirm/prompt dialog in the active tab. Execute browser_hover Hover over element on page

All 17 YetiBrowser MCP tools →

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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_select_option

What does the browser_select_option tool do? +

Select an option in a dropdown. 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_select_option? +

Register the YetiBrowser MCP server in PolicyLayer and add a rule for browser_select_option: 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_select_option? +

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

Can I rate-limit browser_select_option? +

Yes. Add a rate_limit block to the browser_select_option 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_select_option completely? +

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

browser_select_option 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 →