Core Concepts

Understand the five key concepts that power Skybridge: write once run everywhere, data flow, LLM context sync, fast iteration, and type safety.

We assume that you are already familiar with ChatGPT Apps, MCP Apps, and MCP Servers. If you’re not, read Fundamentals first.

Five concepts power Skybridge:

Write Once, Run Everywhere

Write once, run anywhere - ChatGPT, Claude, Goose, VSCode, etc.

Data Flow

How data moves between server, host, and widget

LLM Context Sync

Keep the model aware of widget state via data-llm

Fast Iteration

Local development with instant feedback

Type Safety

End-to-end TypeScript types from server to widget

Start with Write Once, Run Everywhere — it explains how Skybridge abstracts runtime differences so you can focus on your app.