browser_drag · MCProxy MCP: Risk & Policy

WHAT IT DOES

What browser_drag does on MCProxy

AI agents invoke browser_drag to trigger actions in MCProxy. 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 browser_drag needs a policy

This tool executes a browser UI action (drag gesture) that triggers external operations in a controlled headless browser. The effects depend on what element is being dragged and the context (e.g., moving files, manipulating UI controls, drawing). It falls under Execute as it performs browser interactions whose consequences vary by arguments and target page state.

From the tool's definition 'Drag from one coordinate to another' and 'Useful for sliders, drag-and-drop, and drawing' — triggers browser interaction/actions in a headless browser

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

browser_drag Rate-limited

browser_drag 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": {
    "browser_drag": {
      "limits": [
        {
          "counter": "browser_drag_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 MCProxy, so you can run agents against it safely.

FAQ

Questions about browser_drag

What does the browser_drag tool do? +

Drag from one coordinate to another. All coordinates are RELATIVE (0-1 range). Useful for sliders, drag-and-drop, and drawing. It is categorised as a Execute tool in the MCProxy MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on browser_drag? +

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

What risk level is browser_drag? +

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

Can I rate-limit browser_drag? +

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

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

browser_drag is provided by the MCProxy MCP server (saladtechnologies/mcproxy). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.