Sample code that shows how to invoke an Agentforce Agent from Apex

AgentAIInvoker.cls

public with sharing class AgentAIInvoker {
    public static void invokeAIAgent() {
        try {
            // Create an instance of the invocable action with type 'generateAiAgentResponse' and name 'Agentforce_Service_Agent_new'
            Invocable.Action action = Invocable.Action.createCustomAction(
                'generateAiAgentResponse',
                'Agentforce_Service_Agent_new'
            );

            action.setInvocationParameter('userMessage', 'Summarize my case');
            action.setInvocationParameter('CaseId', '500VW0000022nZlYAI');

            // Execute the action
            List<Invocable.Action.Result> results = action.invoke();
            Invocable.Action.Result result = results[0];

            // Handle the response
            if (result.isSuccess()) {
                // Retrieve the Session id and Agent Response
                System.debug(
                    'Output Session Id: ' +
                    result.getOutputParameters().get('sessionId')
                );
                System.debug(
                    'Output Agent Response: ' +
                    result.getOutputParameters().get('agentResponse')
                );
            } else {
                System.debug(
                    'Apex action execution failed: ' + result.getErrors()
                );
            }
        } catch (Exception e) {
            System.debug('Error invoking Apex action: ' + e.getMessage());
        }
    }
}