A Schema-first agent layer for Foldkit: project an application's Model and Message union into one contract, then expose it through WebMCP, MCP, or in-app agents.
Fifteen packages that extend a Foldkit application outward — to agents, servers, other devices, the URL, and design systems — without giving it a second place to keep state.
A Foldkit application is one state machine: a Schema-typed Model, a Message union naming everything that can happen, and one pure update function that turns a Message into the next Model and some Commands. That shape is easy to reason about, test, and replay. It gets lost the moment an app grows a cache in a hook, a store in the URL, a tool handler that re-implements a transition, or a sync layer with its own reducer.
Everything in this repository keeps the one state machine. An agent can only send Messages update already handles. Server data lives in the Model and is reconciled by update. Replicas replay the same Messages through the same update. The URL and local storage mirror a slice of the Model; they never own one. Views are styled from outside without forking. Each package answers one question, and they compose because they meet at explicit application boundaries.
The fastest way to understand Foldkit Plus is to watch several packages reuse one application declaration. Assume Model, Message, initial, and update are an ordinary Foldkit app you already wrote. Everything around them derives from the same state machine; none of it introduces a second reducer.
Read the Mixins part from left to right: Board defines the state/Message boundary, BoardSlots defines the supported customization points, BoardStyle is pure attachment data for those points, and BoardView maps Board's projected Model to mark
From the project README.
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