Simple ChatApp with FoundationModels Framework

A simple chat app using the FoundationModels framework introduced in WWDC 2025.

This app contains the following.

1. Start a new session / load one from conversation history
2. Get a response (with or without streaming)
3. Specify system prompt (instructions)
4. Observable tool
5. Inspect call graph and generate views based on the transcript property of the LanguageModelSession

For more details, please refer to my blog: SwiftUI: Demystify Foundation Model in SUPER Detail! With a Chat App!