Prompt Engineering as a Product Layer, Not a Hack

April 24, 2026

Draft — replace with a hook about the day we stopped shipping prompt changes the way we ship copy fixes.

The mindset shift

  • What "prompt as a hack" looks like in practice
  • Why that mindset breaks the moment you have more than one user persona
  • The shift: prompts as a product layer with owners, versions, and a review process

The overlay system at Trywebb

  • What the overlay actually is (one base, many category-specific lenses)
  • Why we don't fork the whole prompt per category
  • A concrete example: how the overlay changes what the financial agent vs. the consumer-app agent looks at

Who owns prompts

  • What changed when prompts moved out of "engineer commits a string" territory
  • How PM, design, and engineering each touch the prompt layer
  • The review surface we wish existed

When prompts are real product surface

  • The tell: when a prompt change is indistinguishable from a feature change to the user
  • What to instrument so you can tell which one shipped the result
  • The trap of treating prompts as code-only when the user-facing impact is product-level
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