update_resource · AWS IoT SiteWise MCP Server MCP

WHAT IT DOES

What update_resource does on AWS IoT SiteWise MCP Server

AI agents use update_resource 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 update_resource needs a policy

The tool modifies existing resources without deleting them. AWS IoT SiteWise resources typically include asset hierarchies, properties, and configurations. An AI agent misusing this could alter industrial IoT asset data or configurations, causing operational disruption or data corruption—warranting medium severity.

From the tool's definition Tool name 'update_resource' indicates modification of data. Description is empty, limiting direct confirmation, but the verb 'update' unambiguously implies a reversible write operation on AWS IoT SiteWise resources.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_resource Rate-limited

update_resource 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_resource": {
      "limits": [
        {
          "counter": "update_resource_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 update_resource

What does the update_resource tool do? +

update_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 update_resource? +

Register the AWS IoT SiteWise MCP Server MCP server in PolicyLayer and add a rule for update_resource: 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 update_resource? +

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

Can I rate-limit update_resource? +

Yes. Add a rate_limit block to the update_resource 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_resource completely? +

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

update_resource 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.