The three-hour wall
Every developer who uses Claude Code hits the same wall. The first hour is magic. You are productive, Claude remembers what you told it, the code it writes matches your patterns. Then somewhere around hour three, things quietly fall apart.
Claude starts writing functions in camelCase when your project uses snake_case. It adds Express error handling patterns to your Fastify project. It forgets the architecture decision you explained forty minutes ago. You find yourself re-explaining the same context, re-correcting the same mistakes, and watching your conversation history grow to the point where Claude is spending more tokens reading its own earlier output than thinking about your current problem.
This is not a model limitation. This is a configuration problem.
Most developers interact with Claude Code the same way they interact with ChatGPT — as a conversation. They type instructions, get responses, and repeat. When they want Claude to remember something, they stuff it into a CLAUDE.md file. When that file gets too long, they add more sections. When those sections contradict each other, they add clarifying notes. And the cycle continues until the CLAUDE.md file is 400 lines of accumulated instructions, half of which are irrelevant to any given task.
