Hitting Claude's Context Limit Mid-Build and How CLAUDE.md Fixes It

Fazm Team··2 min read

Hitting Claude's Context Limit Mid-Build and How CLAUDE.md Fixes It

You are three hours into a complex refactor. Claude Code has been executing perfectly - understanding your architecture, making the right changes, running tests. Then the conversation gets too long and context starts compressing. Suddenly the agent forgets your database schema, your naming conventions, and why you started this refactor in the first place.

This is the context limit wall, and every developer using Claude Code hits it eventually.

What Actually Happens at the Limit

Claude Code's CLI handles context limits by compressing older messages. This is smarter than just cutting off the conversation, but compression is lossy. The agent keeps recent exchanges clear but earlier decisions and architectural context get fuzzy.

For short tasks this is fine. For multi-hour builds that touch dozens of files, it means the agent gradually loses track of the bigger picture while still being sharp on the last few edits.

CLAUDE.md Is Persistent Context

The fix is simple: keep a CLAUDE.md file in your project root. This file gets loaded at the start of every Claude Code session and survives context compression because it is read from disk, not from conversation history.

Put your project's essential context in there:

  • Architecture decisions and patterns to follow
  • File naming conventions
  • Testing requirements
  • Database schema summaries
  • API contracts between services

What Belongs in CLAUDE.md vs. Conversation

CLAUDE.md should have things that stay true across the entire project. Do not put task-specific instructions there. Those belong in the conversation prompt.

Think of CLAUDE.md as the project's constitution - the rules that every agent session should follow regardless of what specific task it is working on.

The Compound Effect

The real payoff comes when you run multiple Claude Code sessions. Each one picks up the same CLAUDE.md, so every agent operates with the same baseline understanding. No re-explaining your stack, no correcting wrong assumptions, no watching an agent use camelCase when your project uses snake_case.

One file, every session, consistent results.

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Fazm is an open source macOS AI agent. Open source on GitHub.

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