diff --git a/src/tools/_factory.ts b/src/tools/_factory.ts
index cbb9ed0..fa86d1c 100644
--- a/src/tools/_factory.ts
+++ b/src/tools/_factory.ts
@@ -2,6 +2,7 @@ import type { ZodObject, z } from 'zod'
 
 import { ApiError, api } from '../api/client.js'
 
+/** Zod object type alias used throughout the tool factory */
 type AnyZodObject = ZodObject
 
 export interface ToolAnnotations {