sdk_disconnect · UI Bridge MCP: Risk & Policy

WHAT IT DOES

What sdk_disconnect does on UI Bridge MCP

AI agents use sdk_disconnect 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 sdk_disconnect needs a policy

Disconnecting from an external application modifies the state of the connection (a reversible action) without permanently destroying data or executing arbitrary operations. This is a Write operation since it changes the session/connection state.

From the tool's definition Tool name 'sdk_disconnect' and description 'Disconnect from the SDK app' indicate termination of an active connection state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sdk_disconnect Rate-limited

sdk_disconnect 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": {
    "sdk_disconnect": {
      "limits": [
        {
          "counter": "sdk_disconnect_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 sdk_disconnect

What does the sdk_disconnect tool do? +

Disconnect from the SDK app. 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 sdk_disconnect? +

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

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

Can I rate-limit sdk_disconnect? +

Yes. Add a rate_limit block to the sdk_disconnect 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_disconnect completely? +

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

sdk_disconnect 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.