> For the complete documentation index, see [llms.txt](https://docs.stammer.ai/stammer.ai-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.stammer.ai/stammer.ai-docs/chat-ai-agents/functions-labs/custom-functions-legacy.md).

# Custom Functions (Legacy)

- [How Custom Functions Work (Legacy)](https://docs.stammer.ai/stammer.ai-docs/chat-ai-agents/functions-labs/custom-functions-legacy/how-custom-functions-work-legacy.md): Learn more about how to build your own custom functions for your AI agent.
- [Code Generation Prompt for Custom Functions](https://docs.stammer.ai/stammer.ai-docs/chat-ai-agents/functions-labs/custom-functions-legacy/code-generation-prompt-for-custom-functions.md): Instructions: Replace the information inside the \[brackets] to be what you want the AI agent to do.
- [Stock Market Data - Custom Function (Legacy)](https://docs.stammer.ai/stammer.ai-docs/chat-ai-agents/functions-labs/custom-functions-legacy/stock-market-data-custom-function-legacy.md): How to build an AI agent that knows live stock market data.
- [Airtable - Custom Function (Legacy)](https://docs.stammer.ai/stammer.ai-docs/chat-ai-agents/functions-labs/custom-functions-legacy/airtable-custom-function-legacy.md): This is how you can create a custom function that will integrate with your Airtable database.
- [Google Sheets - Custom Function (Legacy)](https://docs.stammer.ai/stammer.ai-docs/chat-ai-agents/functions-labs/custom-functions-legacy/google-sheets-custom-function-legacy.md): This tutorial will show you how to create a custom function that will be able to pull data from a Google sheet and return that info to the user inside the conversation.
- [Shopify - Custom Function (Legacy)](https://docs.stammer.ai/stammer.ai-docs/chat-ai-agents/functions-labs/custom-functions-legacy/shopify-custom-function-legacy.md): Learn how to connect your AI agent to a Shopify store to get live data.