scroll · Wraith MCP: Risk & Policy

WHAT IT DOES

What scroll does on Wraith

AI agents invoke scroll to trigger actions in Wraith. 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 needs a policy

Scrolling is a browser interaction that triggers page-level effects (e.g., lazy-loading content, infinite scroll pagination, triggering JavaScript scroll events). It is an Execute-category action because it performs an external browser operation whose effects depend on the current page state and arguments.

From the tool's definition 'Scroll the page' — triggers a browser action (scrolling) and 'return a new snapshot' indicates it interacts with a live browser session, constituting an external browser operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

scroll Rate-limited

scroll 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": {
      "limits": [
        {
          "counter": "scroll_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 Wraith, so you can run agents against it safely.

FAQ

Questions about scroll

What does the scroll tool do? +

Scroll the page, then return a new snapshot. It is categorised as a Execute tool in the Wraith 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? +

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

What risk level is scroll? +

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

Can I rate-limit scroll? +

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

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

scroll is provided by the Wraith MCP server (koreahwan/wraith-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.