I changed one line in my Claude Code config — dropped my API bill by 90%

The.claude/ folder nobody talks about If you're using Claude Code, you've probably got a.claude/ folder sitting in your project right now. Most developers ignore it. That's expensive. Hacker News lit up this week with a thread about the anatomy of the.claude/ folder - 226 points, 117 comments. The thing people kept coming back to: Claude Code's default configuration sends everything to Anthropic at full retail price. Here's what the config looks like out of the box: { "model": "claude-opus-4", "maxTokens": 8192 } Nothing wrong with that.