Your Codebase Is the New Prompt

Chapter 3 Deep-Dive: Your Codebase Is the Interface Companion document to "Software Development in the Agentic Era" By Mike, in collaboration with Claude (Anthropic) The main guide argues that in the agentic era, your codebase has become the primary interface to the AI — its architecture, tests, and documentation determine whether agents help or create chaos. Easy to state; harder to operationalize. This chapter looks at what the claim means in practice, what the evidence actually supports, and