Harness engineering: Preparing TypeScript codebases for coding agents

Vibe coding is upon us, but it works best when the codebase has strong affordances — a concept in design that describes the possible actions an actor (in this case, a coding agent) can take, in relation to an object (in this case, the codebase): Affordance: a use or purpose that a thing can have, that people notice as part of the way they see or experience it. For a coding agent like Claude Code or Cursor to produce productive code instead of "AI slop" that becomes expensive to maintain and clea