list_append_multiple · AWS IoT SiteWise MCP Server MCP

WHAT IT DOES

What list_append_multiple does on AWS IoT SiteWise MCP Server

AI agents use list_append_multiple 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 list_append_multiple needs a policy

The tool appends (adds) multiple values to an existing list, which is a data modification operation. This is reversible in principle (values can be removed), placing it in the Write category. Severity is medium because bulk appending to lists could have meaningful side effects depending on what the list controls, but the description lacks detail about the target resource, lowering confidence slightly.

From the tool's definition Append multiple values to list

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

list_append_multiple Rate-limited

list_append_multiple 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": {
    "list_append_multiple": {
      "limits": [
        {
          "counter": "list_append_multiple_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 list_append_multiple

What does the list_append_multiple tool do? +

Append multiple values to list. 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 list_append_multiple? +

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

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

Can I rate-limit list_append_multiple? +

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

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

list_append_multiple 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.