scroll_page · MacWright MCP: Risk & Policy

WHAT IT DOES

What scroll_page does on MacWright

AI agents invoke scroll_page 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_page needs a policy

This tool executes JavaScript in Safari to control page scrolling. While the effect (changing scroll position) is reversible, it runs JavaScript in a browser context via an external operation, which classifies it as Execute. Misuse could scroll pages to mislead users or trigger scroll-based JavaScript events.

From the tool's definition Scroll the current Safari page using JavaScript window.scrollBy() or scrollTo()

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

scroll_page Rate-limited

scroll_page 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_page": {
      "limits": [
        {
          "counter": "scroll_page_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_page

What does the scroll_page tool do? +

Scroll the current Safari page using JavaScript window.scrollBy() or scrollTo(). Works regardless of which app is frontmost — no focus required. Use this instead of scroll for web pages. Returns new scroll position and a preview of visible text content. Use. 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_page? +

Register the MacWright MCP server in PolicyLayer and add a rule for scroll_page: 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_page? +

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

Can I rate-limit scroll_page? +

Yes. Add a rate_limit block to the scroll_page 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_page completely? +

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

scroll_page 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.