ui_drag · UI Bridge MCP: Risk & Policy

WHAT IT DOES

What ui_drag does on UI Bridge MCP

AI agents invoke ui_drag to trigger actions in UI Bridge 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 ui_drag needs a policy

The name 'ui_drag' strongly implies a drag interaction on a UI element — a physical UI action that triggers external operations in the target application. This is an Execute-category action (browser/UI automation). The description is empty, which lowers confidence, but the server context (UI interaction, control mode) and sibling tools like 'sdk_ai_execute' confirm this is an action-triggering server.

From the tool's definition Tool name 'ui_drag' on a UI Bridge MCP server that 'enables AI to inspect and interact with UI elements' and supports 'control mode' and 'SDK mode for external applications'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

ui_drag Rate-limited

ui_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": {
    "ui_drag": {
      "limits": [
        {
          "counter": "ui_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 UI Bridge MCP, so you can run agents against it safely.

FAQ

Questions about ui_drag

What does the ui_drag tool do? +

ui_drag. It is categorised as a Execute tool in the UI Bridge 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 ui_drag? +

Register the UI Bridge MCP server in PolicyLayer and add a rule for ui_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 UI Bridge MCP. Nothing to install.

What risk level is ui_drag? +

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

Can I rate-limit ui_drag? +

Yes. Add a rate_limit block to the ui_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 ui_drag completely? +

Set action: deny in the PolicyLayer policy for ui_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 ui_drag? +

ui_drag is provided by the UI Bridge MCP server (qontinui/ui-bridge-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.