Improve README opening with stronger value proposition

README.md

@@ -10,6 +10,16 @@
 A composable, versioned library of prompt templates for software engineering tasks.
 Designed for software engineers who design, develop, and debug software.
 
+**Agentic prompts are the most important code you're not engineering.**
+Every AI-assisted task — investigating bugs, writing requirements, reviewing code — lives or dies by the prompt that drives it.
+Yet most teams still write these prompts ad hoc: copy-pasted, untested, inconsistent, and impossible to improve systematically.
+
+PromptKit treats prompts as code. It gives you composable, version-controlled
+components — personas, reasoning protocols, output formats, and task
+templates — that snap together into reliable, repeatable prompts. The same
+engineering rigor you apply to your software (modularity, reuse, testing,
+code review) now applies to the prompts that build it.
+
 ## Prerequisites
 
 - **Git** — [Install Git](https://git-scm.com/)