diff --git a/src/services/llm/index.ts b/src/services/llm/index.ts
new file mode 100644
index 0000000..1a504a2
--- /dev/null
+++ b/src/services/llm/index.ts
@@ -0,0 +1,9 @@
+export {
+  LlmService,
+  type ILlmService,
+  type LlmConfig,
+  type LlmGenerationMeta,
+  type GenerateQuestionsInput,
+  type GenerateQuestionsResult,
+  type GeneratedQuestion,
+} from './llm.service.js';
diff --git a/src/services/llm/llm.service.ts b/src/services/llm/llm.service.ts
index b12870b..d49f1f2 100644
--- a/src/services/llm/llm.service.ts
+++ b/src/services/llm/llm.service.ts
@@ -71,7 +71,12 @@ export interface GenerateQuestionsResult {
   meta: LlmGenerationMeta;
 }
 
-export class LlmService {
+/** Interface for QuestionService dependency injection and testing */
+export interface ILlmService {
+  generateQuestions(input: GenerateQuestionsInput): Promise<GenerateQuestionsResult>;
+}
+
+export class LlmService implements ILlmService {
   private readonly config: LlmConfig;
 
   constructor(config?: Partial<LlmConfig>) {