diff --git a/packages/toolbox-core/tests/test_e2e.py b/packages/toolbox-core/tests/test_e2e.py
index 0b926e178..72a351531 100644
--- a/packages/toolbox-core/tests/test_e2e.py
+++ b/packages/toolbox-core/tests/test_e2e.py
@@ -462,3 +462,41 @@ async def test_run_tool_with_wrong_map_value_type(self, toolbox: ToolboxClient):
                 execution_context={"env": "staging"},
                 user_scores={"user4": "not-an-integer"},
             )
+
+@pytest.mark.asyncio
+@pytest.mark.usefixtures("toolbox_server")
+class TestComplexParamsNativeE2E:
+    """Tests all 4 tools using the Native Async protocol."""
+
+    async def test_process_list_array(self, toolbox: ToolboxClient):
+        tool = await toolbox.load_tool("process-list")
+        response = await tool(
+            email="twishabansal@google.com",
+            tags=["urgent", "row1", "verified"]
+        )
+        assert "twishabansal" in response
+
+    async def test_handle_nested_config_map(self, toolbox: ToolboxClient):
+        tool = await toolbox.load_tool("handle-nested-config")
+        response = await tool(
+            filter={"status": "active"},
+            metadata={"source": "e2e-test", "row_ref": "row2"}
+        )
+        assert "active" in response
+
+    async def test_manage_data_batches_mixed(self, toolbox: ToolboxClient):
+        tool = await toolbox.load_tool("manage-data-batches")
+        response = await tool(
+            email="twishabansal@google.com",
+            batches={"primary": [1, 2], "secondary": [3]}
+        )
+        assert "primary" in response
+
+    async def test_lookup_by_profile_deep(self, toolbox: ToolboxClient):
+        tool = await toolbox.load_tool("lookup-by-profile")
+        profile_data = {
+            "identity": {"email": "twishabansal@google.com"},
+            "schedule": {"cron": "0 9 * * 1", "timezone": "PST"}
+        }
+        response = await tool(profile=profile_data)
+        assert "twishabansal" in response
diff --git a/packages/toolbox-core/tests/test_e2e_mcp.py b/packages/toolbox-core/tests/test_e2e_mcp.py
index 6acaeaded..3be9ee63b 100644
--- a/packages/toolbox-core/tests/test_e2e_mcp.py
+++ b/packages/toolbox-core/tests/test_e2e_mcp.py
@@ -446,3 +446,41 @@ async def test_run_tool_with_wrong_map_value_type(self, toolbox: ToolboxClient):
                 execution_context={"env": "staging"},
                 user_scores={"user4": "not-an-integer"},
             )
+
+@pytest.mark.asyncio
+@pytest.mark.usefixtures("toolbox_server")
+class TestComplexParamsNativeE2E:
+    """Tests all 4 tools using the Native Async protocol."""
+
+    async def test_process_list_array(self, toolbox: ToolboxClient):
+        tool = await toolbox.load_tool("process-list")
+        response = await tool(
+            email="twishabansal@google.com",
+            tags=["urgent", "row1", "verified"]
+        )
+        assert "twishabansal" in response
+
+    async def test_handle_nested_config_map(self, toolbox: ToolboxClient):
+        tool = await toolbox.load_tool("handle-nested-config")
+        response = await tool(
+            filter={"status": "active"},
+            metadata={"source": "e2e-test", "row_ref": "row2"}
+        )
+        assert "active" in response
+
+    async def test_manage_data_batches_mixed(self, toolbox: ToolboxClient):
+        tool = await toolbox.load_tool("manage-data-batches")
+        response = await tool(
+            email="twishabansal@google.com",
+            batches={"primary": [1, 2], "secondary": [3]}
+        )
+        assert "primary" in response
+
+    async def test_lookup_by_profile_deep(self, toolbox: ToolboxClient):
+        tool = await toolbox.load_tool("lookup-by-profile")
+        profile_data = {
+            "identity": {"email": "twishabansal@google.com"},
+            "schedule": {"cron": "0 9 * * 1", "timezone": "PST"}
+        }
+        response = await tool(profile=profile_data)
+        assert "twishabansal" in response
diff --git a/packages/toolbox-core/tests/test_sync_e2e.py b/packages/toolbox-core/tests/test_sync_e2e.py
index a306cedc2..ba4227672 100644
--- a/packages/toolbox-core/tests/test_sync_e2e.py
+++ b/packages/toolbox-core/tests/test_sync_e2e.py
@@ -185,3 +185,20 @@ def test_run_tool_param_auth_no_field(
             match="no field named row_data in claims",
         ):
             tool()
+
+@pytest.mark.usefixtures("toolbox_server")
+class TestComplexParamsSyncE2E:
+    """Verifies all 4 tools using the Synchronous client."""
+
+    def test_all_sync_complex_tools(self, toolbox: ToolboxSyncClient):
+        t1 = toolbox.load_tool("process-list")
+        assert "twishabansal" in t1(email="twishabansal@google.com", tags=["sync-tag"])
+
+        t2 = toolbox.load_tool("handle-nested-config")
+        assert "sync-meta" in t2(filter={}, metadata={"info": "sync-meta"})
+
+        t3 = toolbox.load_tool("manage-data-batches")
+        assert "sync_batch" in t3(email="twishabansal@google.com", batches={"sync_batch": [5]})
+
+        t4 = toolbox.load_tool("lookup-by-profile")
+        assert "twishabansal" in t4(profile={"identity": {"email": "twishabansal@google.com"}})