sdk_undo · UI Bridge MCP: Risk & Policy

WHAT IT DOES

What sdk_undo does on UI Bridge MCP

AI agents invoke sdk_undo 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 sdk_undo needs a policy

This tool executes an undo operation in a connected external application, which is a reversible state-change action. While undo is typically reversible, it still constitutes execution of a command whose effects depend on the application's state and recent history.

From the tool's definition Tool name 'sdk_undo' and description 'Execute undo in the connected SDK app' indicate the tool triggers an undo action in an external application. The word 'Execute' directly signals code/action execution.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sdk_undo Rate-limited

sdk_undo 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": {
    "sdk_undo": {
      "limits": [
        {
          "counter": "sdk_undo_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 sdk_undo

What does the sdk_undo tool do? +

Execute undo in the connected SDK app. Uses the app. 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 sdk_undo? +

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

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

Can I rate-limit sdk_undo? +

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

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

sdk_undo 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.