Boris Cherny: Building Claude Code

Claude Code creator Boris Cherny details the paradigm shift in building agentic AI products, emphasizing that modern models like Opus 5 require an empirical, "unhobbling" approach rather than rigid, over-specified scaffolding. By deleting legacy system prompts and allowing models to operate autonomously, developers can unlock latent capabilities, such as long-running tasks that span weeks and complex code refactoring across entire repositories. Effective agentic design involves creating dynamic workflows where models orchestrate thousands of agents to verify their own work, perform maintenance, and solve problems that previously required months of human engineering. This shift necessitates moving away from traditional, over-engineered software development toward a scientific, iterative process where developers observe model behavior, identify failure points, and provide only essential guardrails, ultimately enabling AI to handle increasingly complex, autonomous software development cycles.