diff --git a/packages/toolbox-adk/README.md b/packages/toolbox-adk/README.md
index 5f08162a..bc9b3ea7 100644
--- a/packages/toolbox-adk/README.md
+++ b/packages/toolbox-adk/README.md
@@ -67,19 +67,15 @@ You can explicitly select a protocol using the `protocol` option during toolset
 | Constant | Description |
 | :--- | :--- |
 | `Protocol.MCP` | **(Default)** Alias for the default MCP version (currently `2025-06-18`). |
-| `Protocol.TOOLBOX` | **DEPRECATED**: The native Toolbox HTTP protocol. Will be removed on March 4, 2026. |
 | `Protocol.MCP_v20251125` | MCP Protocol version 2025-11-25. |
 | `Protocol.MCP_v20250618` | MCP Protocol version 2025-06-18. |
 | `Protocol.MCP_v20250326` | MCP Protocol version 2025-03-26. |
 | `Protocol.MCP_v20241105` | MCP Protocol version 2024-11-05. |
 
 > [!WARNING]
-> The **Native Toolbox Protocol** (`Protocol.TOOLBOX`) is deprecated and will be removed on **March 4, 2026**.
-> Please migrate to using the **MCP Protocol** (`Protocol.MCP`), which is the default.
 
 ### Example
 
-If you wish to use the native Toolbox protocol:
 
 ```python
 from toolbox_adk import ToolboxToolset
@@ -87,7 +83,7 @@ from toolbox_core.protocol import Protocol
 
 toolset = ToolboxToolset(
     server_url="http://127.0.0.1:5000",
-    protocol=Protocol.TOOLBOX
+    protocol=Protocol.MCP
 )
 ```
 
diff --git a/packages/toolbox-core/README.md b/packages/toolbox-core/README.md
index 0e6555ee..a3c9b474 100644
--- a/packages/toolbox-core/README.md
+++ b/packages/toolbox-core/README.md
@@ -160,24 +160,20 @@ You can explicitly select a protocol using the `protocol` option during client i
 | Constant | Description |
 | :--- | :--- |
 | `Protocol.MCP` | **(Default)** Alias for the default MCP version (currently `2025-06-18`). |
-| `Protocol.TOOLBOX` | **DEPRECATED**: The native Toolbox HTTP protocol. Will be removed on March 4, 2026. |
 | `Protocol.MCP_v20251125` | MCP Protocol version 2025-11-25. |
 | `Protocol.MCP_v20250618` | MCP Protocol version 2025-06-18. |
 | `Protocol.MCP_v20241105` | MCP Protocol version 2024-11-05. |
 
 > [!WARNING]
-> The **Native Toolbox Protocol** (`Protocol.TOOLBOX`) is deprecated and will be removed on **March 4, 2026**.
-> Please migrate to using the **MCP Protocol** (`Protocol.MCP`), which is the default.
 
 ### Example
 
-If you wish to use the native Toolbox protocol:
 
 ```py
 from toolbox_core import ToolboxClient
 from toolbox_core.protocol import Protocol
 
-async with ToolboxClient("http://127.0.0.1:5000", protocol=Protocol.TOOLBOX) as toolbox:
+async with ToolboxClient("http://127.0.0.1:5000", protocol=Protocol.MCP) as toolbox:
     # Use client
     pass
 ```
diff --git a/packages/toolbox-core/tests/test_tool.py b/packages/toolbox-core/tests/test_tool.py
index 41cf5a72..080a2dd7 100644
--- a/packages/toolbox-core/tests/test_tool.py
+++ b/packages/toolbox-core/tests/test_tool.py
@@ -35,6 +35,31 @@
 TEST_TOOL_NAME = "sample_tool"
 
 
+class MockTransport(ITransport):
+    def __init__(self, base_url, session=None):
+        self._base_url = base_url
+        self.tool_invoke_mock = AsyncMock()
+        self.tool_get_mock = AsyncMock()
+        self.tools_list_mock = AsyncMock()
+        self.close_mock = AsyncMock()
+
+    @property
+    def base_url(self):
+        return self._base_url
+
+    async def tool_invoke(self, *args, **kwargs):
+        return await self.tool_invoke_mock(*args, **kwargs)
+
+    async def tool_get(self, *args, **kwargs):
+        return await self.tool_get_mock(*args, **kwargs)
+
+    async def tools_list(self, *args, **kwargs):
+        return await self.tools_list_mock(*args, **kwargs)
+
+    async def close(self, *args, **kwargs):
+        return await self.close_mock(*args, **kwargs)
+
+
 class MockTransport(ITransport):
     def __init__(self, base_url, session=None):
         self._base_url = base_url
diff --git a/packages/toolbox-langchain/README.md b/packages/toolbox-langchain/README.md
index ce28eaad..7c38841c 100644
--- a/packages/toolbox-langchain/README.md
+++ b/packages/toolbox-langchain/README.md
@@ -107,25 +107,21 @@ You can explicitly select a protocol using the `protocol` option during client i
 | Constant | Description |
 | :--- | :--- |
 | `Protocol.MCP` | **(Default)** Alias for the default MCP version (currently `2025-06-18`). |
-| `Protocol.TOOLBOX` | **DEPRECATED**: The native Toolbox HTTP protocol. Will be removed on March 4, 2026. |
 | `Protocol.MCP_v20251125` | MCP Protocol version 2025-11-25. |
 | `Protocol.MCP_v20250618` | MCP Protocol version 2025-06-18. |
 | `Protocol.MCP_v20250326` | MCP Protocol version 2025-03-26. |
 | `Protocol.MCP_v20241105` | MCP Protocol version 2024-11-05. |
 
 > [!WARNING]
-> The **Native Toolbox Protocol** (`Protocol.TOOLBOX`) is deprecated and will be removed on **March 4, 2026**.
-> Please migrate to using the **MCP Protocol** (`Protocol.MCP`), which is the default.
 
 ### Example
 
-If you wish to use the native Toolbox protocol:
 
 ```py
 from toolbox_langchain import ToolboxClient
 from toolbox_core.protocol import Protocol
 
-async with ToolboxClient("http://127.0.0.1:5000", protocol=Protocol.TOOLBOX) as toolbox:
+async with ToolboxClient("http://127.0.0.1:5000", protocol=Protocol.MCP) as toolbox:
     # Use client
     pass
 ```
diff --git a/packages/toolbox-llamaindex/README.md b/packages/toolbox-llamaindex/README.md
index 3cdfdea1..eb26862b 100644
--- a/packages/toolbox-llamaindex/README.md
+++ b/packages/toolbox-llamaindex/README.md
@@ -111,25 +111,21 @@ You can explicitly select a protocol using the `protocol` option during client i
 | Constant | Description |
 | :--- | :--- |
 | `Protocol.MCP` | **(Default)** Alias for the default MCP version (currently `2025-06-18`). |
-| `Protocol.TOOLBOX` | **DEPRECATED**: The native Toolbox HTTP protocol. Will be removed on March 4, 2026. |
 | `Protocol.MCP_v20251125` | MCP Protocol version 2025-11-25. |
 | `Protocol.MCP_v20250618` | MCP Protocol version 2025-06-18. |
 | `Protocol.MCP_v20250326` | MCP Protocol version 2025-03-26. |
 | `Protocol.MCP_v20241105` | MCP Protocol version 2024-11-05. |
 
 > [!WARNING]
-> The **Native Toolbox Protocol** (`Protocol.TOOLBOX`) is deprecated and will be removed on **March 4, 2026**.
-> Please migrate to using the **MCP Protocol** (`Protocol.MCP`), which is the default.
 
 ### Example
 
-If you wish to use the native Toolbox protocol:
 
 ```py
 from toolbox_llamaindex import ToolboxClient
 from toolbox_core.protocol import Protocol
 
-async with ToolboxClient("http://127.0.0.1:5000", protocol=Protocol.TOOLBOX) as toolbox:
+async with ToolboxClient("http://127.0.0.1:5000", protocol=Protocol.MCP) as toolbox:
     # Use client
     pass
 ```