Claude Code Context Window Management: Mastering Large Codebases

Learn advanced strategies for managing Claude Code's context window when working with large monorepos, complex architectures, and multi-service projects…

Context Management Strategies Comparison

Understanding What Fills the Context Window

Strategy 1: .claudeignore — The Highest-Impact Quick Fix

Strategy 2: The FOCUS Method for Large Codebases

Strategy 3: Session Patterns

Strategy 4: Monorepo Techniques

Token Budget Management

Code Patterns That Help Context Efficiency

Here are the five core strategies ranked by effort, impact, and when to use them:

When you start a session, the context includes:

As a session progresses, all of this accumulates. A session that starts with plenty of room becomes context-constrained after extensive file exploration and multiple rounds of changes.

Like .gitignore, the .claudeignore file tells Claude Code what to skip. For most projects, this is the single most impactful optimization you can make.

Instead of loading all relevant files at once, feed them to Claude Code as they become relevant. Start with the file you are primarily modifying, then add related files only when Claude Code needs them.

Monorepos present the biggest context challenge because everything is technically one project.