diff --git a/src/converters/HttpLlmConverter.ts b/src/converters/HttpLlmConverter.ts
index 9f2bc42..0c239c8 100644
--- a/src/converters/HttpLlmConverter.ts
+++ b/src/converters/HttpLlmConverter.ts
@@ -168,6 +168,7 @@ const composeFunction =
         return operation.description ?? operation.summary;
       })(),
       deprecated: operation.deprecated,
+      tags: operation.tags,
       route: () => route,
       operation: () => operation,
     };
diff --git a/src/structures/IHttpLlmFunction.ts b/src/structures/IHttpLlmFunction.ts
index 6250b44..d7592b8 100644
--- a/src/structures/IHttpLlmFunction.ts
+++ b/src/structures/IHttpLlmFunction.ts
@@ -195,6 +195,13 @@ export interface IHttpLlmFunction<
    */
   deprecated?: boolean | undefined;
 
+  /**
+   * Category tags for the function.
+   *
+   * Same with {@link OpenApi.IOperation.tags} indicating the category of the function.
+   */
+  tags?: string[];
+
   /**
    * Get the Swagger operation metadata.
    *
diff --git a/src/structures/ILlmFunction.ts b/src/structures/ILlmFunction.ts
index 8cbf497..c275207 100644
--- a/src/structures/ILlmFunction.ts
+++ b/src/structures/ILlmFunction.ts
@@ -67,6 +67,13 @@ export interface ILlmFunction<Schema extends ILlmSchema = ILlmSchema> {
    * LLM (Large Language Model) may not use the deprecated function.
    */
   deprecated?: boolean | undefined;
+
+  /**
+   * Category tags for the function.
+   *
+   * You can fill this property by the `@tag ${name}` comment tag.
+   */
+  tags?: string[];
 }
 export namespace ILlmFunction {
   /**
diff --git a/test/controllers/AppController.ts b/test/controllers/AppController.ts
index 3cab31d..74a402a 100644
--- a/test/controllers/AppController.ts
+++ b/test/controllers/AppController.ts
@@ -31,6 +31,10 @@ export class AppController {
     return { index, level, optimal, query };
   }
 
+  /**
+   * @tag body
+   * @tag post
+   */
   @TypedRoute.Post(":index/:level/:optimal/body")
   public body(
     @TypedParam("index")
diff --git a/test/features/llm/test_http_llm_function_tags.ts b/test/features/llm/test_http_llm_function_tags.ts
new file mode 100644
index 0000000..88c172f
--- /dev/null
+++ b/test/features/llm/test_http_llm_function_tags.ts
@@ -0,0 +1,20 @@
+import { TestValidator } from "@nestia/e2e";
+import {
+  HttpLlm,
+  IHttpLlmApplication,
+  IHttpLlmFunction,
+  OpenApi,
+} from "@samchon/openapi";
+
+import swagger from "../../swagger.json";
+
+export const test_http_llm_function_deprecated = (): void => {
+  const document: OpenApi.IDocument = OpenApi.convert(swagger as any);
+  const application: IHttpLlmApplication = HttpLlm.application(document, {
+    keyword: true,
+  });
+  const func: IHttpLlmFunction | undefined = application.functions.find(
+    (f) => f.method === "post" && f.path === "/{index}/{level}/{optimal}/body",
+  );
+  TestValidator.equals("tags")(func?.tags)(["body", "post"]);
+};
diff --git a/test/swagger.json b/test/swagger.json
index 9d3b4b4..34070e2 100644
--- a/test/swagger.json
+++ b/test/swagger.json
@@ -7,7 +7,7 @@
     }
   ],
   "info": {
-    "version": "1.0.4",
+    "version": "1.0.5",
     "title": "@samchon/openapi",
     "description": "OpenAPI definitions and converters for 'typia' and 'nestia'.",
     "license": {
@@ -127,7 +127,10 @@
     },
     "/{index}/{level}/{optimal}/body": {
       "post": {
-        "tags": [],
+        "tags": [
+          "body",
+          "post"
+        ],
         "parameters": [
           {
             "name": "index",
@@ -437,6 +440,13 @@
       }
     }
   },
-  "tags": [],
+  "tags": [
+    {
+      "name": "body"
+    },
+    {
+      "name": "post"
+    }
+  ],
   "x-samchon-emended": true
 }
\ No newline at end of file