diff --git a/package.json b/package.json
index 99284d2925..2c6cd0c020 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "typia",
-  "version": "7.5.0",
+  "version": "7.5.1",
   "description": "Superfast runtime validators with only one line",
   "main": "lib/index.js",
   "typings": "lib/index.d.ts",
diff --git a/src/programmers/llm/LlmApplicationProgrammer.ts b/src/programmers/llm/LlmApplicationProgrammer.ts
index e8d385ffb0..4403b0d97a 100644
--- a/src/programmers/llm/LlmApplicationProgrammer.ts
+++ b/src/programmers/llm/LlmApplicationProgrammer.ts
@@ -242,9 +242,14 @@ export namespace LlmApplicationProgrammer {
     > = LlmSchemaComposer.parameters(props.model)({
       config: LlmSchemaComposer.defaultConfig(props.model) as any,
       components: props.components,
-      schema: schema as
-        | OpenApi.IJsonSchema.IObject
-        | OpenApi.IJsonSchema.IReference,
+      schema: {
+        ...(schema as
+          | OpenApi.IJsonSchema.IObject
+          | OpenApi.IJsonSchema.IReference),
+        title: schema.title ?? props.function.parameters[0]?.title,
+        description:
+          schema.description ?? props.function.parameters[0]?.description,
+      },
       accessor: props.accessor,
     }) as IResult<ILlmSchema.ModelParameters[Model], IOpenApiSchemaError>;
     if (result.success === false) {
diff --git a/test/src/debug/llm.application.ts b/test/src/debug/llm.application.ts
deleted file mode 100644
index bab3cd8894..0000000000
--- a/test/src/debug/llm.application.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import { ILlmApplication } from "@samchon/openapi";
-import typia from "typia";
-
-interface SomeApplication {
-  plus(props: { x: number; y: number }): number;
-
-  /**
-   * @human
-   */
-  minus(props: { x: number; y: number }): number;
-}
-
-const app: ILlmApplication<"chatgpt"> = typia.llm.application<
-  SomeApplication,
-  "chatgpt"
->();
-console.log(app);
diff --git a/test/src/features/issues/test_pr_1442_llm_function_parameters_description.ts b/test/src/features/issues/test_pr_1442_llm_function_parameters_description.ts
new file mode 100644
index 0000000000..39e6b2c839
--- /dev/null
+++ b/test/src/features/issues/test_pr_1442_llm_function_parameters_description.ts
@@ -0,0 +1,134 @@
+import { ILlmApplication, ILlmFunction } from "@samchon/openapi";
+import typia, { tags } from "typia";
+
+import { TestValidator } from "../../helpers/TestValidator";
+
+export const test_pr_1442_llm_function_parameters_description = (): void => {
+  const app: ILlmApplication<"chatgpt"> = typia.llm.application<
+    BbsArticleController,
+    "chatgpt"
+  >();
+  for (const func of app.functions)
+    TestValidator.equals("parameters.description")(
+      !!func.parameters.description,
+    )(true);
+
+  const func: ILlmFunction<"chatgpt"> | undefined = app.functions.find(
+    (func) => func.name === "create",
+  );
+  TestValidator.equals("parameters.description")(
+    !!func?.parameters.description,
+  )(true);
+  TestValidator.equals("output.description")(!!func?.output?.description)(true);
+};
+
+interface BbsArticleController {
+  /**
+   * Create a new article.
+   *
+   * Writes a new article and archives it into the DB.
+   *
+   * @param props Properties of create function
+   * @returns Newly created article
+   */
+  create(props: {
+    /**
+     * Information of the article to create
+     */
+    input: IBbsArticle.ICreate;
+  }): Promise<IBbsArticle>;
+
+  /**
+   * Update an article.
+   *
+   * Updates an article with new content.
+   *
+   * @param props Properties of update function
+   * @param input New content to update
+   */
+  update(props: {
+    /**
+     * Target article's {@link IBbsArticle.id}.
+     */
+    id: string & tags.Format<"uuid">;
+
+    /**
+     * New content to update.
+     */
+    input: IBbsArticle.IUpdate;
+  }): Promise<void>;
+
+  /**
+   * Erase an article.
+   *
+   * Erases an article from the DB.
+   *
+   * @param props Properties of erase function
+   */
+  erase(props: {
+    /**
+     * Target article's {@link IBbsArticle.id}.
+     */
+    id: string & tags.Format<"uuid">;
+  }): Promise<void>;
+}
+
+/**
+ * Article entity.
+ *
+ * `IBbsArticle` is an entity representing an article in the BBS (Bulletin Board System).
+ */
+interface IBbsArticle extends IBbsArticle.ICreate {
+  /**
+   * Primary Key.
+   */
+  id: string & tags.Format<"uuid">;
+
+  /**
+   * Creation time of the article.
+   */
+  created_at: string & tags.Format<"date-time">;
+
+  /**
+   * Last updated time of the article.
+   */
+  updated_at: string & tags.Format<"date-time">;
+}
+namespace IBbsArticle {
+  /**
+   * Information of the article to create.
+   */
+  export interface ICreate {
+    /**
+     * Title of the article.
+     *
+     * Representative title of the article.
+     */
+    title: string;
+
+    /**
+     * Content body.
+     *
+     * Content body of the article writtn in the markdown format.
+     */
+    body: string;
+
+    /**
+     * Thumbnail image URI.
+     *
+     * Thumbnail image URI which can represent the article.
+     *
+     * If configured as `null`, it means that no thumbnail image in the article.
+     */
+    thumbnail:
+      | null
+      | (string & tags.Format<"uri"> & tags.ContentMediaType<"image/*">);
+  }
+
+  /**
+   * Information of the article to update.
+   *
+   * Only the filled properties will be updated.
+   */
+  export type IUpdate = Partial<ICreate>;
+}