Delete a user from a specific realm
AI agents call delete-user to permanently remove resources in Keycloak — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool performs an irreversible deletion operation that cannot be undone. Deleting a user from an identity management system like Keycloak removes authentication records, role assignments, and user data permanently. This represents a destructive action with significant blast radius if invoked by an AI agent against unintended targets, warranting high severity.
From the tool's definition Tool name 'delete-user' combined with description 'Delete a user from a specific realm' explicitly indicates irreversible removal of user data.
Attacks that exploit this kind of access
Delete a user from a specific realm. It is categorised as a Destructive tool in the Keycloak MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Keycloak MCP server in PolicyLayer and add a rule for delete-user: 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.
delete-user is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the delete-user 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.
Set action: deny in the PolicyLayer policy for delete-user. 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.
delete-user 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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