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Build and test your work: mock states in isolation, or live against a real platform, on every channel at once. Studio is the workbench for everything you author. It runs on your own machine, reads your files straight off disk, and needs Node and nothing else.
It opens on http://localhost:4108 and finds your project by looking for rx/ in the current folder or any parent. Studio covers the setup in full.

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πŸ–₯️ What you get

Because Studio is just another MCP client β€” same SDK, same definition resources, same component stream as production β€” what you see is what ships (02). Hot reload isn’t a dev trick: it’s the same resources/subscribe β†’ updated mechanism that live-updates production channels. The top nav is flat β€” Apps Β· Components Β· Styles Β· Nodes Β· AI β€” and a header org switcher scopes the whole Studio: the Apps list, the Components list (the design system + the selected org’s own components only), and the preview theme. All shows everything cross-org, with an org badge per card. Atoms have no Studio view β€” they’re authoring-time only; the server expands them before anything is served.

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πŸ§ͺ Mode A β€” Mock (isolation)

Render a component or template with mock data and mock history, no backend logic involved. This is your daily loop while designing.

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Mock data = prop defaults. The state picker = the states/ folder.

Two mechanisms, zero hand-maintained fixtures:
  1. Prop defaults are the mock data. Studio renders every definition from its declared defaults β€” which is why defaults should be realistic content, not empty strings.
  2. Two docks β€” layouts on top, states on the left. A component has two axes, and Studio never shares one control between them:
    • its layout faces β€” the root Switch on defaultState cases (inline, focused, a custom product) β€” are a toggle at the top of the toolbar (first control after the name). Any face name appears automatically; inline always leads; a flat component with no face switch shows no toggle. Any non-inline face gets the grow container.
    • its own states/ files (a wizard’s private steps, goals.json … results.json) are the left-rail list under the component’s name.
    Picking a face writes defaultState into the slice; picking a state walks the wizard β€” both via the same generic setValue a real component’s buttons use. (Templates work the same way: the app’s states/ are the picker β€” one active at a time; acting inside the preview transitions state like the runtime.)
So β€œviewable states” is not extra work β€” it falls straight out of organizing a definition into layers (03): the folder that structures your Switch cases is the same folder Studio reads. Use the picker to exercise every discriminant value (each wizard step, inline/focused, each callState phase), and vary prop defaults to check edge data (empty lists, long text β€” how you catch a bind without a default). Apps show their widget’s states too. Selecting an app template (a single-widget shell) also lists its seeded component’s states as pills β€” a wizard’s steps are one click each, activated by writing the widget’s Switch discriminant into its slice, exactly what its own buttons do.

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πŸ“‹ Copy for Canvas β€” drop a component onto a workflow

When a component is selected, Studio shows a ⧉ Copy for Canvas button. It copies the component as a Canvas node to your clipboard; then Cmd+V on any workflow Canvas pastes it in, sized to the component’s nodeSize. This is how a design component reaches a workflow β€” the node library no longer lists components, so you preview it here, copy it, and paste it where the workflow needs it. (No file edit, no restart; it’s just placing the node.)

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πŸ”΄ Mode B β€” Live (the proof)

Flip the toggle and Studio connects as an MCP client to your real running platform. Real workflows stream real components, select real templates, deliver real data β€” into the local preview. You are watching production behavior before shipping. Use Live mode to verify the things mock can’t:
  • your component’s node receives and merges streamed COMPONENT_DATA correctly,
  • the template selection picks your app for the intents you wrote whenToUse for,
  • reaction flow: the widget streams in (or is clicked) into a state, the template’s where surface frames it, its βœ• returns it inline cleanly,
  • turn lifecycle: thinking indicators derived from isStreaming appear and β€” critically β€” clear.

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πŸ”¬ DevTools β€” when something looks wrong

Debugging order, always: stream log (did it arrive?) β†’ state inspector (is it in the bucket I read?) β†’ the definition (is my bind/condition right?). Never start by editing the definition on a guess β€” see the data first.

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πŸ” The full loop

For pure definition edits (layouts, styles, copy), the resource subscription refreshes the preview live β€” no restart at all. A restart is only needed when the component’s node must change (new props, a new component, discovery meta), because node definitions synthesize from your JSON at boot β€” there is no code generation step, ever.
Next: 08 β€” Validate & Ship.