dom_replace_html · Claude Imagine MCP: Risk & Policy

WHAT IT DOES

What dom_replace_html does on Claude Imagine

AI agents use dom_replace_html 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 dom_replace_html needs a policy

The tool creates or modifies HTML content in the DOM, which is data that can be changed and updated. While it doesn't delete data permanently (hence not Destructive) and doesn't execute arbitrary code (hence not Execute), it does write/modify the UI state.

From the tool's definition Tool name 'dom_replace_html' and description 'Replace the HTML content of an element' indicate modification of DOM elements. This is a reversible write operation that changes the visual UI.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

dom_replace_html Rate-limited

dom_replace_html 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": {
    "dom_replace_html": {
      "limits": [
        {
          "counter": "dom_replace_html_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 dom_replace_html

What does the dom_replace_html tool do? +

Replace the HTML content of an element. 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 dom_replace_html? +

Register the Claude Imagine MCP server in PolicyLayer and add a rule for dom_replace_html: 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 dom_replace_html? +

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

Can I rate-limit dom_replace_html? +

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

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

dom_replace_html 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.

// THE FULL RECORD

dom_replace_html is one line of Claude Imagine's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

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