docs: add AI-friendly documentation for LLM assistants

- Add llms.txt and llms-full.txt for AI assistants (Cursor, Copilot, Claude, ChatGPT)
- Add AI Assistants guide page with setup instructions
- Update README with AI assistants section and quick links
- Update sidebar to include AI Assistants page

Author: hyochan

README.md

@@ -32,6 +32,16 @@ If you're shipping an app with expo-iap, we’d love to hear about it—please s
 
 **[📖 Visit our comprehensive documentation site →](https://hyochan.github.io/expo-iap)**
 
+## Using with AI Assistants
+
+expo-iap provides AI-friendly documentation for Cursor, GitHub Copilot, Claude, and ChatGPT.
+
+**[📖 AI Assistants Guide →](https://hyochan.github.io/expo-iap/guides/ai-assistants)**
+
+Quick links:
+- [llms.txt](https://hyochan.github.io/expo-iap/llms.txt) - Quick reference
+- [llms-full.txt](https://hyochan.github.io/expo-iap/llms-full.txt) - Full API reference
+
 ## Notice
 
 The `expo-iap` module has been migrated from [react-native-iap](https://github.com/hyochan/react-native-iap). While we initially considered fully merging everything into `react-native-iap`, we ultimately decided to maintain the two libraries in parallel, each tailored to its own ecosystem.

docs/docs/guides/ai-assistants.md

@@ -0,0 +1,134 @@
+---
+sidebar_position: 10
+title: Using with AI Assistants
+---
+
+import IapKitBanner from "@site/src/uis/IapKitBanner";
+
+# Using with AI Assistants
+
+<IapKitBanner />
+
+expo-iap provides AI-friendly documentation for use with AI coding assistants like Cursor, GitHub Copilot, Claude, and ChatGPT.
+
+## AI-Optimized Documentation
+
+We provide two documentation formats optimized for AI assistants:
+
+| Format | Description | URL |
+|--------|-------------|-----|
+| Quick Reference | Concise API overview (~300 lines) | [llms.txt](/llms.txt) |
+| Full Reference | Complete API documentation (~1000 lines) | [llms-full.txt](/llms-full.txt) |
+
+## Add to Cursor
+
+[Cursor](https://cursor.sh/) allows you to add custom documentation sources:
+
+1. Open Cursor Settings (`Cmd+,` on Mac or `Ctrl+,` on Windows/Linux)
+2. Go to **Features** > **Docs**
+3. Click **Add new doc**
+4. Enter the URL: `https://hyochan.github.io/expo-iap/llms.txt`
+5. Give it a name like "expo-iap"
+
+Now when you ask Cursor about expo-iap, it will reference the official documentation.
+
+## Add to GitHub Copilot
+
+For GitHub Copilot Chat in VS Code:
+
+1. Open a new chat (`Ctrl+Shift+I` or `Cmd+Shift+I`)
+2. Reference the documentation URL in your prompt:
+
+```
+@workspace Using https://hyochan.github.io/expo-iap/llms-full.txt as reference,
+help me implement in-app purchases with expo-iap
+```
+
+## Add to Claude or ChatGPT
+
+When using Claude or ChatGPT, you can provide the documentation URL directly in your prompt:
+
+```
+Please refer to https://hyochan.github.io/expo-iap/llms-full.txt for the expo-iap API documentation.
+
+Help me implement a subscription purchase flow with expo-iap.
+```
+
+Or paste the content of `llms.txt` or `llms-full.txt` directly into your conversation for better context.
+
+## Direct URL Access
+
+You can access the AI documentation directly:
+
+- **Quick Reference**: [https://hyochan.github.io/expo-iap/llms.txt](https://hyochan.github.io/expo-iap/llms.txt)
+- **Full Reference**: [https://hyochan.github.io/expo-iap/llms-full.txt](https://hyochan.github.io/expo-iap/llms-full.txt)
+
+## What's Included
+
+### Quick Reference (`llms.txt`)
+
+- Installation instructions
+- `useIAP` hook basic usage
+- Core API signatures
+- Key type definitions
+- Common patterns
+- Error handling basics
+
+### Full Reference (`llms-full.txt`)
+
+- Complete installation and configuration guide
+- Full `useIAP` hook API with all options
+- All direct API functions with examples
+- Complete type definitions
+- Full error code reference
+- iOS and Android platform-specific APIs
+- Common implementation patterns
+- Troubleshooting guide
+
+## Example Prompts
+
+Here are some example prompts that work well with the AI documentation:
+
+### Basic Setup
+
+```
+Using expo-iap documentation, show me how to set up a basic store
+with product fetching and purchase handling.
+```
+
+### Subscription Implementation
+
+```
+How do I implement subscription purchases with expo-iap?
+Include Android offer tokens handling.
+```
+
+### Error Handling
+
+```
+What are all the error codes in expo-iap and how should I handle them?
+```
+
+### Platform-Specific Features
+
+```
+Show me how to use iOS-specific features like refund requests
+and subscription status checking in expo-iap.
+```
+
+### Restore Purchases
+
+```
+How do I implement a "Restore Purchases" button with expo-iap?
+```
+
+## Tips for Better Results
+
+1. **Be specific**: Mention expo-iap explicitly in your prompts
+2. **Reference the docs**: Include the documentation URL for more accurate answers
+3. **Provide context**: Mention your platform (iOS/Android) if relevant
+4. **Ask for examples**: Request code examples for practical implementation
+
+## Feedback
+
+If you find issues with the AI documentation or have suggestions for improvement, please [open an issue](https://github.com/hyochan/expo-iap/issues) on GitHub.

docs/sidebars.ts

@@ -96,6 +96,11 @@ const sidebars: SidebarsConfig = {
         'examples/alternative-billing',
       ],
     },
+    {
+      type: 'doc',
+      id: 'guides/ai-assistants',
+      label: 'AI Assistants',
+    },
     {
       type: 'doc',
       id: 'sponsors',