AI agents call list-realms to retrieve information from Keycloak without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query to enumerate realms in a Keycloak instance. It has no destructive, financial, or state-changing effects. While exposure of realm information could support reconnaissance, the impact is minimal without write or execute capabilities on those realms. Severity is low as it only provides informational access.
From the tool's definition Tool name 'list-realms' and description 'List all available realms' indicate a query operation that retrieves realm data without modification or side effects.
Attacks that exploit this kind of access
List all available realms. It is categorised as a Read tool in the Keycloak MCP Server, which means it retrieves data without modifying state.
Register the Keycloak MCP server in PolicyLayer and add a rule for list-realms: 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.
list-realms is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list-realms 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 list-realms. 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.
list-realms 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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