microsoft/vscode-prompt-tsx

The `@vscode/prompt-tsx` library provides a TypeScript/TSX-based framework for building prompts in VS Code extensions that integrate with Copilot Chat. It allows developers to declaratively construct AI prompts using a component-based syntax, automatically handling token budgeting, context window constraints, and prioritization of content through features like `flexGrow`, `TokenLimit`, and `KeepWith` elements. The library is designed for VS Code extension developers who need to create dynamic, context-aware prompts that can adapt to model limitations while maintaining readability and flexibility compared to traditional string-based prompt construction.