add-user-to-group · Keycloak MCP: Risk & Policy

WHAT IT DOES

What add-user-to-group does on Keycloak

AI agents use add-user-to-group to create or update resources in Keycloak — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Keycloak environment.

WHY IT NEEDS A POLICY

Why add-user-to-group needs a policy

This tool modifies identity/access control state by adding a user to a group, which affects group memberships and potentially access permissions. The change is reversible (users can be removed from groups), so it is Write rather than Destructive.

From the tool's definition Tool description states 'Add a user to a group' — this creates a new membership association between a user and a group, modifying user data and group membership reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add-user-to-group Rate-limited

add-user-to-group 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": {
    "add-user-to-group": {
      "limits": [
        {
          "counter": "add-user-to-group_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 Keycloak, so you can run agents against it safely.

FAQ

Questions about add-user-to-group

What does the add-user-to-group tool do? +

Add a user to a group. It is categorised as a Write tool in the Keycloak MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add-user-to-group? +

Register the Keycloak MCP server in PolicyLayer and add a rule for add-user-to-group: 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 Keycloak. Nothing to install.

What risk level is add-user-to-group? +

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

Can I rate-limit add-user-to-group? +

Yes. Add a rate_limit block to the add-user-to-group 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 add-user-to-group completely? +

Set action: deny in the PolicyLayer policy for add-user-to-group. 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 add-user-to-group? +

add-user-to-group is provided by the Keycloak MCP server (keycloak-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.