update_ui · Claude Imagine MCP: Risk & Policy

WHAT IT DOES

What update_ui does on Claude Imagine

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

WHY IT NEEDS A POLICY

Why update_ui needs a policy

This tool modifies web interface content reversibly via HTML updates. It is Write rather than Execute because it changes UI presentation without running arbitrary code or shell commands. It is not Destructive because HTML updates can be reverted or overwritten.

From the tool's definition Tool description explicitly states 'Update the main UI container with new HTML content' — a modification operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_ui Rate-limited

update_ui 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": {
    "update_ui": {
      "limits": [
        {
          "counter": "update_ui_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 Claude Imagine, so you can run agents against it safely.

FAQ

Questions about update_ui

What does the update_ui tool do? +

Update the main UI container with new HTML content. It is categorised as a Write tool in the Claude Imagine MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_ui? +

Register the Claude Imagine MCP server in PolicyLayer and add a rule for update_ui: 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 Claude Imagine. Nothing to install.

What risk level is update_ui? +

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

Can I rate-limit update_ui? +

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

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

update_ui is provided by the Claude Imagine MCP server (t3rm1nu55/claudeimagine). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.