attach_user_policy · AWS IoT SiteWise MCP Server MCP

WHAT IT DOES

What attach_user_policy does on AWS IoT SiteWise MCP Server

AI agents use attach_user_policy 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 attach_user_policy needs a policy

Attaching a policy to a user modifies IAM configuration reversibly (policies can be detached), making this a Write operation. However, the blast radius is high because incorrect policy attachments could grant unintended permissions to AWS resources, affecting security posture. Not Destructive because the action is reversible; not Execute because it doesn't run arbitrary code—it modifies access control state.

From the tool's definition Tool name 'attach_user_policy' indicates creation or modification of IAM policy attachments. Sibling tools like 'add_inline_policy' and 'add_user_to_group' confirm this server handles identity and access management operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

attach_user_policy Rate-limited

attach_user_policy 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": {
    "attach_user_policy": {
      "limits": [
        {
          "counter": "attach_user_policy_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 attach_user_policy

What does the attach_user_policy tool do? +

attach_user_policy. 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 attach_user_policy? +

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

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

Can I rate-limit attach_user_policy? +

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

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

attach_user_policy 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.