python-genai v2.32.0

The headline feature in python-genai 2.32.0, Google's Python SDK for Gemini, is for the Live API, which keeps a long-running streaming session open for real-time conversation. Until now, a session's system instruction and tools were fixed when it began. The new send_context_update method lets an application change either one mid-session; only the fields passed are updated, an empty list clears the tools, and the docstring says updates are processed in order with the session's other inputs. That makes it possible, for example, to give a voice agent a new set of tools when the conversation moves to a different task, without starting over.

The docstring also gives a cost warning: the system instruction and tools sit at the start of what the model reads, so changing them invalidates the prefix cache, and Google advises updating them only when strictly necessary because of a possible performance impact. A separate fix in the same release matters to Live API users who return images from tools. As described in issue 3022, send_tool_response crashed with a JSON serialisation error when a function response contained raw image bytes, so the response was never sent. The SDK now base64-encodes those bytes. Other changes include a new generation_output_config option and a fix for responses with JSON objects in loosely typed fields.