Can coding agents like Claude Code actually build my product?

Yes, further than most founders expect: teams like Every ship multiple products with engineers writing almost zero code by hand, and 80-90% of Claude Code itself is written by Claude. The catch is the 70% problem: agents get you a working MVP fast, but the last stretch (edge cases, security, production hardening) still needs engineering judgment, and AI-generated code frequently ships vulnerabilities if nobody reviews it. Treat the agent as a very fast builder whose work you spec, review and test, and pick the tool for your level: Lovable or Bolt if you never want to see code, Claude Code or Cursor if you or a teammate will.