ui_reset · UI Bridge MCP: Risk & Policy

WHAT IT DOES

What ui_reset does on UI Bridge MCP

AI agents use ui_reset to create or update resources in UI Bridge MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your UI Bridge MCP environment.

WHY IT NEEDS A POLICY

Why ui_reset needs a policy

Resetting a form clears/reverts user-entered data back to its default state. This is a reversible modification (data can be re-entered), making it a Write-category action. However, it could cause unintended loss of unsaved form input, giving it a medium severity blast radius.

From the tool's definition Reset the form containing the element in the runner

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

ui_reset Rate-limited

ui_reset stays usable, but capped — an agent stuck in a loop can't make hundreds of changes 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_reset": {
      "limits": [
        {
          "counter": "ui_reset_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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_reset

What does the ui_reset tool do? +

Reset the form containing the element in the runner. It is categorised as a Write tool in the UI Bridge MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on ui_reset? +

Register the UI Bridge MCP server in PolicyLayer and add a rule for ui_reset: 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_reset? +

ui_reset is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit ui_reset? +

Yes. Add a rate_limit block to the ui_reset 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_reset completely? +

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

ui_reset 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.