Module 25: Context Engineering

Context engineering — context window anatomy, RAG as context construction, memory architectures, and compression with LLMLingua and RECOMP.

May 28, 20261 min readFollow

Topics You Will Master

Context window anatomy: tokens, ordering, and recency bias
Treating RAG as context construction
Chunking strategies and their impact on context quality
Memory architectures: short-term, episodic, semantic, procedural

Module Overview

This module frames context as a managed resource. It covers how the context window behaves, how retrieval is really a context-construction problem, the memory architectures that persist information across turns and sessions, and the compression techniques that keep context within budget.

Learning Objectives

  • Explain context window anatomy and recency bias.
  • Treat RAG as context construction and choose chunking for context quality.
  • Distinguish short-term, episodic, semantic, and procedural memory.
  • Apply context compression and pruning with LLMLingua and RECOMP.
  • Manage multi-turn conversation state and context accumulation.

Topics Covered

Context Window Anatomy & RAG as Context Construction

  • Anatomy of a context window (tokens, ordering, recency bias)
  • Retrieval-augmented generation as context construction
  • Chunking strategies and their impact on context quality

Memory Architectures & Structured Context

  • Memory architectures (short-term, episodic, semantic, procedural)
  • Tool results and structured data as context

Context Compression, Pruning & Multi-Turn State

  • Context compression and pruning (LLMLingua, RECOMP)
  • Multi-turn conversation state and context accumulation

Key Concepts & Terminology

Recency/lost-in-the-middle effects, context budget, memory tiers, prompt compression, context pruning, conversation state accumulation.

Tools & Frameworks Referenced

LLMLingua, RECOMP, memory stores for agent state.

Prerequisites

Modules 16–17 (RAG) and Module 22 (prompt engineering).

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