Long Context Conversation With 128k Token Window

via “multi-turn conversation state management with context window optimization”

AI PDF chatbot agent built with LangChain & LangGraph

Unique: Implements sliding window context management at the application level (not delegated to LLM) using explicit token counting, allowing fine-grained control over what context is preserved. Separates conversation state (frontend) from document embeddings (backend), enabling independent lifecycle management.

vs others: More efficient than always-including-full-history approaches because it actively manages token budget; more transparent than black-box context managers because token decisions are visible and tunable.