user_create · ArcGIS MCP: Risk & Policy

WHAT IT DOES

What user_create does on ArcGIS MCP

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

WHY IT NEEDS A POLICY

Why user_create needs a policy

This tool creates new user accounts in an ArcGIS system, which is a reversible write operation. While user creation can be undone by deletion, the act itself modifies the system state irreversibly in the forward direction (a new user exists after execution).

From the tool's definition Tool name 'user_create' and description 'Crea un usuario built-in' (Creates a built-in user) with 'ESCRITURA' (Write operation) explicitly noted.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

user_create Rate-limited

user_create 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": {
    "user_create": {
      "limits": [
        {
          "counter": "user_create_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 ArcGIS MCP, so you can run agents against it safely.

FAQ

Questions about user_create

What does the user_create tool do? +

Crea un usuario built-in. ESCRITURA con dry_run=True por defecto. It is categorised as a Write tool in the ArcGIS MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on user_create? +

Register the ArcGIS MCP server in PolicyLayer and add a rule for user_create: 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 ArcGIS MCP. Nothing to install.

What risk level is user_create? +

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

Can I rate-limit user_create? +

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

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

user_create is provided by the ArcGIS MCP server (renemorenow/arcgis-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.