---
date: '2026-01-31T18:00:00Z'
author: claude-opus-4-5-20251101
session: session_01UpqBF2HZhgKCLQXnNqQJHA
type: handoff
importance: 0.7
tags: [handoff, design-system, react, ui, brand]
supersedes: 2026-01-31-07-session-handoff.md
signature: pending
---

# Handoff: Design System Library, Demo Page, Brand Documentation

## What Was Done This Session

1. **Built `@moltnet/design-system` library** (`libs/design-system/`):
   - Design tokens encoding the MoltNet brand: colors (teal primary = network, amber accent = identity tattoo, dark void backgrounds), typography (Inter sans + JetBrains Mono for crypto), spacing, radii, shadows, transitions
   - Dark and light theme definitions with `MoltThemeProvider` React context
   - 10 React components: Button, Text, Card, Badge, Input, Stack, Container, Divider, CodeBlock, KeyFingerprint
   - `useTheme()` and `useThemeMode()` hooks for token access
   - 12 tests covering token structure and theme completeness

2. **Built visual demo page** (`libs/design-system/demo/`):
   - Vite dev server showcasing every token and component
   - Color swatches, typography scale, all button/card/badge variants
   - Full agent profile composition example combining multiple components
   - Dark/light theme toggle
   - Run with: `npm run demo --workspace=@moltnet/design-system`

3. **Documented design system in CLAUDE.md**:
   - Brand identity table (token meanings)
   - Typography guidance
   - Usage example with MoltThemeProvider
   - Component catalog
   - 7 rules for UI builders (import from design-system, dark-first, accent=identity, primary=network, etc.)

4. **Fixed CI safeguard**:
   - Root `tsc --noEmit` was failing because `.tsx` files need `jsx` and `DOM` lib
   - Rather than leaking DOM globals into server packages, excluded `libs/design-system` from root tsconfig
   - Root typecheck now chains: `tsc --noEmit && npm run typecheck --workspace=@moltnet/design-system`
   - Updated root `eslint` and `lint-staged` to include `.tsx` files

## What's Not Done Yet

- No application consuming the design system yet (WS5 MCP server, WS6 REST API have no UI)
- No Storybook or isolated component testing — demo page is sufficient for now, revisit at ~25 components
- Light theme is functional but not polished — dark is the primary theme
- No CSS animation tokens (keyframes) — add when needed

## Current State

- Branch: `claude/design-system-react-KCjEX` (PR opened against main)
- Tests: 12 passing (design-system) + 26 passing (other workspaces) = 50 total
- Lint: 0 errors, 13 warnings (all pre-existing `no-non-null-assertion`)
- Typecheck: clean (root server + design-system browser)
- Build: all 5 workspaces compile
- Demo: builds cleanly (220 kB bundle)

## Decisions Made

- **Inline styles over CSS-in-JS** — components use React inline styles + CSS custom properties. No runtime CSS library dependency. Interactive states (hover/focus) managed via React state hooks.
- **ThemeProvider injects `<style>` tag** — CSS custom properties and global reset injected via `dangerouslySetInnerHTML`. Zero CSS files to import.
- **Separate typecheck for browser code** — root tsconfig stays server-only (`ES2022`, no DOM). Design system has its own tsconfig with `jsx: "react-jsx"` and `DOM` lib. Prevents accidental use of `window`/`document` in server packages.
- **Vite demo over Storybook** — 2 dev dependencies vs ~50+. Sufficient for 10 components. Storybook warranted when component count grows past ~25 or isolated prop playgrounds become necessary.
- **Brand color semantics** — teal = network/connections/actions, amber = identity/keys/signatures. These rules are documented in CLAUDE.md to ensure consistency across agents.

## Open Questions

- When will the first React app be built to consume the design system?
- Should we add a `Container` variant with sidebar layout for the Moltbook agent profiles page?
- Will the design system need SSR support (for Next.js or similar)?

## Where to Start Next

1. Read this handoff entry
2. Read `docs/FREEDOM_PLAN.md` for workstream priorities
3. Likely next steps:
   - **WS3**: Build `libs/diary-service/` — CRUD + semantic search with pgvector
   - **WS5**: Build `apps/mcp-server/` using `@getlarge/fastify-mcp`
   - **UI app**: When building any React app, wrap root with `MoltThemeProvider` and import components from `@moltnet/design-system`
4. When building UI, run the demo first to see the visual language:
   ```bash
   npm run demo --workspace=@moltnet/design-system
   ```
5. Follow the 7 rules in CLAUDE.md "Rules for UI builders" section
