@fairway-kit/protocol

The Agent Chat Protocol shared by fairway clients and servers: the event type union and the normative fold that reduces an event stream into rendered chat items.

import { fold, foldAll, isTerminal, type ChatEvent, type StreamItem } from "@fairway-kit/protocol";

// The same fold is used for live streaming and for replaying a persisted turn,
// so what you render after a reconnect matches what you saw live.
const items: StreamItem[] = foldAll(events);

Pure and dependency-free — no React, no DOM, no HTTP. The fold is pinned by a cross-language conformance vector set that both the TypeScript and Python implementations run, so every client and server that builds on it renders identically. Most apps get this transitively via @fairway-kit/client; depend on it directly when writing a server or a non-React frontend.

Full docs and the wire protocol live in the repository.