Concepts
Concepts
The mental models you need to read SDK code without surprises. One page per non-obvious thing.
If the Quickstart gets you running, this section gets you fluent. Each page is short and answers one question:
The bridge
What `MiniAppClient` actually wraps, and why your code never touches it directly.
Calling an external API
Declare an origin in `manifest.network`, then call it with normal `fetch()`. How the host enforces the allow-list as a CSP.
Error model
Seven errors. Two failure shapes. One decision flow.
These pages don't replace the reference — they're the prose your IDE's hover tooltips can't show.