From 1ae9bb7901013a63d120318f8b69e7d3b6f37f56 Mon Sep 17 00:00:00 2001
From: Elik Song <37071240+dunward@users.noreply.github.com>
Date: Fri, 18 Apr 2025 22:16:04 +0900
Subject: [PATCH 1/3] Remove default stringify

---
 src/tools/BaseTool.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tools/BaseTool.ts b/src/tools/BaseTool.ts
index 3103747..bf7e509 100644
--- a/src/tools/BaseTool.ts
+++ b/src/tools/BaseTool.ts
@@ -127,7 +127,7 @@ export abstract class MCPTool<TInput extends Record<string, any> = {}>
     }
 
     return {
-      content: [{ type: "text", text: JSON.stringify(data) }],
+      content: [{ type: "text", text: data.toString() }],
     };
   }
 

From f8998cd529cffdb06b2013be1f3101c8993c3305 Mon Sep 17 00:00:00 2001
From: Elik Song <elik.song@icloud.com>
Date: Fri, 18 Apr 2025 22:18:02 +0900
Subject: [PATCH 2/3] Change unknown data to string

---
 src/tools/BaseTool.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tools/BaseTool.ts b/src/tools/BaseTool.ts
index bf7e509..c64a04a 100644
--- a/src/tools/BaseTool.ts
+++ b/src/tools/BaseTool.ts
@@ -127,7 +127,7 @@ export abstract class MCPTool<TInput extends Record<string, any> = {}>
     }
 
     return {
-      content: [{ type: "text", text: data.toString() }],
+      content: [{ type: "text", text: String(data) }],
     };
   }
 

From d0b98f4c506fc87c2938a2ba0a6fc6a12c6a7be0 Mon Sep 17 00:00:00 2001
From: Elik Song <elik.song@icloud.com>
Date: Fri, 18 Apr 2025 22:28:41 +0900
Subject: [PATCH 3/3] Add stringify option default for legacy user

---
 src/tools/BaseTool.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/tools/BaseTool.ts b/src/tools/BaseTool.ts
index c64a04a..53ab1f1 100644
--- a/src/tools/BaseTool.ts
+++ b/src/tools/BaseTool.ts
@@ -51,6 +51,7 @@ export abstract class MCPTool<TInput extends Record<string, any> = {}>
   abstract name: string;
   abstract description: string;
   protected abstract schema: ToolInputSchema<TInput>;
+  protected useStringify: boolean = true;
   [key: string]: unknown;
 
   get inputSchema(): { type: "object"; properties?: Record<string, unknown> } {
@@ -127,7 +128,10 @@ export abstract class MCPTool<TInput extends Record<string, any> = {}>
     }
 
     return {
-      content: [{ type: "text", text: String(data) }],
+      content: [{ 
+        type: "text", 
+        text: this.useStringify ? JSON.stringify(data) : String(data) 
+      }],
     };
   }