Save Your Prompts, Update Them Forever

Neo-print illustration: vintage card catalog cabinet with open drawer of organized prompt cards, glowing document hovering above, Cass the cat adding a card

Your prompt library is your competitive advantage.

Quick Answer

Save every prompt that works. Update prompts when you find better approaches. Store them in your project's docs folder as markdown files. This recursive documentation habit is what turns inconsistent AI outputs into reliable, first-try results — and it compounds over time.

When we first started vibe coding, we ran into bugs constantly. The AI would misunderstand intent, generate broken code, and require hours of debugging.

Now we almost never see bugs. The AI didn't change. Our documentation did. This is the code is liquid principle in action.

The Documentation Habit

Every time a prompt produces great results, we save it. Not in a notes app that we'll forget about. In the project itself, in a docs folder, as a markdown file.

Every time we find a better way to phrase something, we update the saved prompt. Every time we discover a new pattern or learn from a mistake, it goes into documentation.

This creates a compound effect. Each project starts with the accumulated knowledge of every previous project. The AI reads this documentation and produces better output from the first prompt.

What Should You Document in Your Prompt Library?

Prompts that work: The exact phrasing that got the result you wanted
Context patterns: How you describe your project's style, architecture, and goals
Lessons learned: What went wrong and how you fixed it
Rules and constraints: Things the AI should always or never do

Practical Tip

Create a file called RULES.md in your project's docs folder. List every convention, preference, and constraint you've discovered. The AI reads this file and follows the rules. Over time, this file becomes your project's operating manual.

Recursive Updating

Neo-print illustration: circular four-stage diagram showing write, use, evaluate, update loop with arrows going clockwise

Write. Use. Evaluate. Update. The loop never stops.

The key word is recursive. You don't write documentation once and forget it. You treat it like a living document that gets better every single day.

Found a better way to generate blog posts? Update the blog generation prompt. Discovered that a certain phrase prevents a common bug? Add it to the rules. Learned that the AI works better when you give it a specific date? Document it.

The Payoff

After a few months of this practice, something shifts. You stop fighting with the AI. Combined with a well-written PRD, your builds become remarkably consistent. Prompts that used to take five attempts work on the first try. New features that used to take hours take minutes.

Neo-print illustration: five X failure marks on left versus single checkmark on first try on right, clock between showing time passing

What used to take five attempts now works on the first try.

Not because you got smarter. Because your documentation did.

❓Where should I keep my prompt library?

Inside your project, in a docs folder, as markdown files. This way the AI tool you're using (Cursor, Claude, etc.) can read them directly and apply the context. Keep them organized by topic -- one file for style guidelines, one for common workflows, one for rules and constraints.

Save Your Prompts, Update Them Forever

The Documentation Habit

What Should You Document in Your Prompt Library?

Recursive Updating

The Payoff

Chris Johnston

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