scroll_to_element · MacWright MCP: Risk & Policy

WHAT IT DOES

What scroll_to_element does on MacWright

AI agents invoke scroll_to_element to trigger actions in MacWright. 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 scroll_to_element needs a policy

This tool triggers a browser action (scrolling a Safari page using scrollIntoView()), which constitutes an external operation with side effects in the browser environment. While relatively benign, it executes JavaScript and manipulates browser state, placing it in the Execute category rather than Read.

From the tool's definition 'Scroll the Safari page until a specific element is visible in the viewport. Uses element.scrollIntoView()'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

scroll_to_element Rate-limited

scroll_to_element 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": {
    "scroll_to_element": {
      "limits": [
        {
          "counter": "scroll_to_element_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 MacWright, so you can run agents against it safely.

FAQ

Questions about scroll_to_element

What does the scroll_to_element tool do? +

Scroll the Safari page until a specific element is visible in the viewport. Uses element.scrollIntoView() with smooth or instant behavior. Returns the element. It is categorised as a Execute tool in the MacWright MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on scroll_to_element? +

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

What risk level is scroll_to_element? +

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

Can I rate-limit scroll_to_element? +

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

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

scroll_to_element is provided by the MacWright MCP server (ruchit-p/macwright). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.