Setting Up AI Development with uv — Start a Claude SDK Project in Under 1 Second

Until last year, every time I started an AI project I'd go through the same ritual. python -m venv .venv , source .venv/bin/activate , pip install anthropic openai ... and then wait. Sometimes over two minutes. Watching anthropic, torch, and pydantic download one by one. The context-switching cost added up. Every time I made a new experiment branch, environment setup broke the flow. The "works on my machine" problem didn't go away either. Then I started using uv — a Python package manager writte