select_option · JS Reverse MCP: Risk & Policy

WHAT IT DOES

What select_option does on JS Reverse MCP

AI agents invoke select_option to trigger actions in JS Reverse MCP. 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

This tool performs a browser action by interacting with a DOM element (a native select/dropdown), which constitutes an automated browser interaction. It triggers UI state changes in an external browser environment, classifying it as Execute. Misuse could cause unintended form submissions or state changes in the browser being analyzed/debugged.

From the tool's definition Select one or more values in a native select element

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 JS Reverse MCP, so you can run agents against it safely.

FAQ

Questions about select_option

What does the select_option tool do? +

Select one or more values in a native select element. It is categorised as a Execute tool in the JS Reverse 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 select_option? +

Register the JS Reverse 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 JS Reverse MCP. 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 JS Reverse MCP server (noone-hub/jsreverser-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.