Escape double quotes inside compiled code description strings

nerve/tools/mcp/compiler.py

@@ -91,7 +91,11 @@ async def create_function_body(client: Client, mcp_tool: Tool) -> tuple[str, dic
     for name, arg_props in mcp_tool.inputSchema.get("properties", {}).items():
         # print(name, arg_props)
         args_def, arg_type = _get_python_type(name, arg_props)
-        arg = {"name": name, "type": _stringify_type(arg_type), "description": arg_props.get("description", "")}
+        arg = {
+            "name": name,
+            "type": _stringify_type(arg_type),
+            "description": arg_props.get("description", "").replace('\\', '\\\\').replace('"', '\\"'),
+        }
 
         if args_def:
             type_defs.update(args_def)

nerve/tools/mcp/compiler_test.py

@@ -200,3 +200,29 @@ async def process_data(user: Annotated[user_0, "User information"], settings: An
 '''.strip(),
             func_body,
         )
+
+    async def test_create_function_body_double_quotes_inside_description(self) -> None:
+        client = MagicMock(spec=Client)
+
+        mock_tool = Tool(
+            name="test_state_tool",
+            description="A tool to test default string handling.",
+            inputSchema={
+                "type": "object",
+                "properties": {
+                    "state": {
+                        "type": "string",
+                        "description": "The state of the \"entity\".",
+                        "default": "open",  # This default value could be misinterpreted as the 'open' function.
+                    },
+                },
+            },
+        )
+
+        func_body, type_defs = await create_function_body(client, mock_tool)
+
+        # Default value to be correctly quoted as a string literal: 'open'
+        self.assertIn(
+            """async def test_state_tool(state: Annotated[str, "The state of the \\\"entity\\\"."] = 'open') -> Any:""",
+            func_body,
+        )