create_schema · AWS IoT SiteWise MCP Server MCP

WHAT IT DOES

What create_schema does on AWS IoT SiteWise MCP Server

AI agents use create_schema 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 create_schema needs a policy

Schema creation is a reversible write operation that modifies the configuration state of AWS IoT SiteWise but does not permanently delete data or execute arbitrary code. The empty description reduces confidence below 0.85, but the 'create_' prefix and write-category sibling tools provide strong contextual evidence for the Write category at medium severity.

From the tool's definition Tool name is 'create_schema' which indicates creation of a schema object. The empty description limits certainty but the naming pattern matches write operations ('create_*') observed in sibling tools like 'add_attachments_to_set' and…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_schema Rate-limited

create_schema 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": {
    "create_schema": {
      "limits": [
        {
          "counter": "create_schema_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 create_schema

What does the create_schema tool do? +

create_schema. 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 create_schema? +

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

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

Can I rate-limit create_schema? +

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

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

create_schema 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.