6 AI Agent Frameworks Compared: Which One Ships Your First Agent Fastest?

If you've tried building an AI agent in the last six months, you've hit the same wall: there are half a dozen frameworks, each with a different philosophy, a different API surface, and a different definition of what an "agent" even is. I spent a weekend writing the same simple agent — "read a GitHub issue, classify it as bug/feature/question, and post a comment" — in six different frameworks. This is what I found. TL;DR Framework Lines of Code* Native Tool System Multi-Agent Learning Curve Best