user_update · ArcGIS MCP: Risk & Policy

WHAT IT DOES

What user_update does on ArcGIS MCP

AI agents use user_update 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_update needs a policy

The tool updates user information, which is a reversible write operation. Severity is high because unauthorized user modifications could affect access controls, permissions, and system integrity across an organization. Confidence is slightly reduced due to the empty description, but the semantic meaning of 'user_update' in a management context is unambiguous.

From the tool's definition Tool name 'user_update' indicates modification of user data. Description is empty, limiting direct confirmation, but the name and context within a user/group management system clearly indicates write operations on user records.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

user_update Rate-limited

user_update 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_update": {
      "limits": [
        {
          "counter": "user_update_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_update

What does the user_update tool do? +

user_update. 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_update? +

Register the ArcGIS MCP server in PolicyLayer and add a rule for user_update: 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_update? +

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

Can I rate-limit user_update? +

Yes. Add a rate_limit block to the user_update 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_update completely? +

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

user_update 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.