MessageBuilder is defined as the component that owns the full message lifecycle by accumulating conversation history and rendering the complete prompt, including system text, history, and reminders, on each turn.

Supporting contexts

Quoteverbatim

**MessageBuilder** (`message_builder.py`): Owns the full message lifecycle

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md

Quoteverbatim

accumulates conversation history

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md

Quoteverbatim

renders complete prompt (system + history + reminders) each turn

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md

Effective from: 7/16/2026, 11:28:43 PM