ui_change_buffer_enable · UI Bridge MCP: Risk & Policy

WHAT IT DOES

What ui_change_buffer_enable does on UI Bridge MCP

AI agents use ui_change_buffer_enable 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_change_buffer_enable needs a policy

This tool modifies configuration or operational state of the UI runner by enabling a buffering feature. It is reversible (can be disabled), affects only the internal buffering behavior (not data deletion or financial operations), and does not execute external code directly. However, the lack of specificity in the description and potential side effects on UI interaction behavior warrant a medium severity rating.

From the tool's definition Tool name contains 'change_buffer_enable' and description states 'Enable change buffering in the runner', indicating it modifies the state of a buffering mechanism.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

ui_change_buffer_enable Rate-limited

ui_change_buffer_enable 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_change_buffer_enable": {
      "limits": [
        {
          "counter": "ui_change_buffer_enable_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_change_buffer_enable

What does the ui_change_buffer_enable tool do? +

Enable change buffering 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_change_buffer_enable? +

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

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

Can I rate-limit ui_change_buffer_enable? +

Yes. Add a rate_limit block to the ui_change_buffer_enable 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_change_buffer_enable completely? +

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

ui_change_buffer_enable 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.