UntagResource · AWS IoT SiteWise MCP Server MCP

WHAT IT DOES

What UntagResource does on AWS IoT SiteWise MCP Server

AI agents use UntagResource to create or update resources in AWS IoT SiteWise MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your AWS IoT SiteWise MCP Server environment.

WHY IT NEEDS A POLICY

Why UntagResource needs a policy

Untagging removes metadata (tags) from a resource. This is a reversible modification — tags can be re-added — so it falls under Write rather than Destructive. However, misuse could break tag-based access control policies or cost allocation tracking, giving it medium severity.

From the tool's definition Removes the tags, identified by the keys, from the specified resource

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

UntagResource Rate-limited

UntagResource 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": {
    "UntagResource": {
      "limits": [
        {
          "counter": "untagresource_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 AWS IoT SiteWise MCP Server, so you can run agents against it safely.

FAQ

Questions about UntagResource

What does the UntagResource tool do? +

Removes the tags, identified by the keys, from the specified resource. It is categorised as a Write tool in the AWS IoT SiteWise MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on UntagResource? +

Register the AWS IoT SiteWise MCP Server MCP server in PolicyLayer and add a rule for UntagResource: 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 AWS IoT SiteWise MCP Server. Nothing to install.

What risk level is UntagResource? +

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

Can I rate-limit UntagResource? +

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

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

UntagResource is provided by the AWS IoT SiteWise MCP Server MCP server (awslabs.aws-iot-sitewise-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.