You hit the wall around week three.
The first sprint with Claude Code or Cursor is magic. Boilerplate evaporates, components materialize, you ship a feature in an afternoon that would have taken a week.
Then the project gets bigger. The third feature contradicts a decision the agent made in the second. The test suite drifts away from what the code actually does. You re-explain the architecture every morning because the context window doesn't remember yesterday. The agent suggests a refactor that breaks something it built last Tuesday.
Anthropic's own engineering blog calls this context engineering — the discipline of curating what the model sees so it can reason about a project that doesn't fit in any one window. AIWG is what the discipline looks like when it's wired into your toolchain instead of done by hand.