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For any AI agent

Prompts, done properly.

Reusable instruction modules for any AI agent — pick, stack, and paste one file into Claude, ChatGPT, Cursor, or any tool. If you don't know how to prompt, that's what these modules are for.

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30
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10
export targets
2
stacks

How it works

Stack modules. Compile one file.

Each module can depend on others. The compiler resolves the order and merges them into a single instruction file, ready for your agent.

Payment System Basics

@markdowners/payment-system-basics

Stripe Integration

@markdowners/stripe-integration

Webhook Handling

@markdowners/webhook-handling

CLAUDE.mdAGENTS.mdGEMINI.md.cursorrules+ 6 more
3 modules → 1 file
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# Payment System Basics
Core rules for handling payments safely: never
store raw card data, validate amounts server-side,
treat webhooks as the source of truth.
 
# Stripe Integration
Stripe-specific integration rules on top of
payment-system-basics: key handling, Elements,
SCA/3DS, and treating webhooks as the source
of truth.
 
# Webhook Handling
Signature verification, idempotency keys, and

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