LangChain, latency optimisation, Reranker model optimisation, RAG systems, LLM capability boundaries, LLM-driven proactive retrieval, Embedding, tool plugin dispatching pipelines, intent recognition, ADK, Agent architectures, RAG vector retrieval, task planning, BM25, Agent frameworks, state tracking, multi-turn conversation management, task completion rates, long short-term memory systems, Prompt Engineering, LlamaIndex