RenderContext - Tinker Documentation
tinker_cookbook.renderers.RenderContext
class tinker_cookbook.renderers.RenderContext()
Context passed to render_message for rendering a single message.
This allows renderers to access information about the message's position in the conversation without changing the render_message signature for each new piece of context needed.
Fields:
- idx ( int) – Index of the message in the conversation (0-based).
- is_last ( bool) – Whether this is the last message in the conversation.
- prev_message ( Message | None, default:
None) – The previous message in the conversation, if any. - last_user_index ( int, default:
-1) – Index of the last user message in the conversation. -1 if no user messages.
This is computed by the base build_generation_prompt/build_supervised_example and used by renderers like Qwen3.5 that need to treat assistant messages differently based on whether they come before or after the last user message.