I Compressed Claude Code's Context by 90% — Here's How

My Claude Code session died mid-debug. Not because the problem was hard — because npm install dumped 150 lines of deprecated warnings into the context window. That's the real cost of context waste. It's not about money (though tokens aren't free). It's about Claude forgetting the code you showed it 5 minutes ago because the window is stuffed with noise. I measured it. A typical Node.js debugging session generates 3,000-5,000 tokens of command output. Over 60% is framework frames, ANSI escape codes, progress spinners, and package manager chatter. Claude reads all of it. Claude learns nothing from it. So I built ContextZip. It sits between your shell and Claude Code, compressing every command output before it reaches the context window. Here are real before/after results. Node.js Error Stacktrace: 93% Saved - TypeError: Cannot read properties of undefined (reading 'id') - at getUserProfile (/app/src/api/users.ts:47:23) - at processAuth (/app/src/middleware/auth.ts:12:5) - at Layer.handle