dom_set_attr · Claude Imagine MCP: Risk & Policy

WHAT IT DOES

What dom_set_attr does on Claude Imagine

AI agents use dom_set_attr 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_set_attr needs a policy

This tool creates or modifies element attributes in the DOM, which is a write operation with potential side effects depending on which attributes are modified (e.g., setting onclick handlers, href, form actions, or data attributes). However, it is reversible—attributes can be changed back or removed. It does not execute code directly, delete data, or move money.

From the tool's definition Tool name 'dom_set_attr' and description 'Set an attribute on an element' indicate modification of DOM elements. This is a write operation that changes element properties (class, id, data attributes, ARIA attributes, etc.) in a reversible manner.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

dom_set_attr Rate-limited

dom_set_attr 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_set_attr": {
      "limits": [
        {
          "counter": "dom_set_attr_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_set_attr

What does the dom_set_attr tool do? +

Set an attribute on 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_set_attr? +

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

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

Can I rate-limit dom_set_attr? +

Yes. Add a rate_limit block to the dom_set_attr 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_set_attr completely? +

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

dom_set_attr 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.