Most of your Claude Code agents don't need Sonnet

I run about 50 Claude Code agent calls a day. Only 8 of them need the expensive model. The rest? They're writing commit messages, reviewing diffs, running tests, generating docs. Tasks that don't require deep reasoning — just reliable pattern matching. And yet, by default, every single one of those calls hits the same model at the same price. Here's how I fixed that with a 3-tier routing strategy that sends each task to the cheapest model that can handle it. The problem: one model fits none Clau