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Part 3: Always-Loaded Context — CLAUDE.md

NOTE

Information that is always loaded when a session begins.
This is a "fixed cost" in the context budget and requires the most careful management.
CLAUDE.md is a representative example in Claude Code. Keeping always-on instructions short is not product-specific.

Why It Matters

CLAUDE.md is information that the LLM reads every turn. This means everything you write here consumes your context budget continuously. Write too much and you trigger Priority Saturation; write too little and the LLM generates code without knowing important constraints.

→ Why: Which Structural Problems Does It Address?

IMPORTANT

• Priority Saturation: The 200-line limit is designed to keep the number of simultaneously active instructions below the degradation threshold.
• Prompt Sensitivity: Concrete, directive language reduces result variance caused by ambiguous phrasing.
• Context Rot: Hierarchical merging and scope separation prevent the accumulation of unnecessary information.

Documents in This Section

Document	Content
Design Principles of CLAUDE.md	What to write and why 200 lines
How Hierarchical Merging Works	Global → Project → Local → Subdirectory
Operating CLAUDE.local.md	Personal configuration outside Git

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Previous: Part 2: Understanding the Context Window
Next: Part 4: Conditional Context