select_option · Brave Browser MCP Server MCP: Risk & Policy

WHAT IT DOES

What select_option does on Brave Browser MCP Server

AI agents invoke select_option to trigger actions in Brave Browser MCP 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 select_option needs a policy

Selecting a dropdown option is a browser action that can trigger page events, form submissions, or UI state changes. While it is a targeted UI interaction, it can have downstream effects depending on what the dropdown controls (e.g., changing settings, filtering data, or initiating navigation). It falls under Execute as it performs an external browser operation whose effects depend on arguments and context.

From the tool's definition 'Selects an option from a <select> dropdown by value or visible text' — triggers a browser interaction/action that modifies UI state and may cause side effects depending on the form context

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

select_option Rate-limited

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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "select_option": {
      "limits": [
        {
          "counter": "select_option_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 Brave Browser MCP Server, so you can run agents against it safely.

FAQ

Questions about select_option

What does the select_option tool do? +

Selects an option from a <select> dropdown by value or visible text. It is categorised as a Execute tool in the Brave Browser MCP 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 select_option? +

Register the Brave Browser MCP Server MCP server in PolicyLayer and add a rule for 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 Brave Browser MCP Server. Nothing to install.

What risk level is select_option? +

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

Can I rate-limit select_option? +

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

Set action: deny in the PolicyLayer policy for 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 select_option? +

select_option is provided by the Brave Browser MCP Server MCP server (slaveofgod1/brave-browser-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.