## Four things you can build 1. **Views** — named queries + rendering config over entities of a given profile. Kanban of tasks, gallery of articles, calendar of events. 2. **Bento dashboards** — 12-col grid compositions of cells (view-cards, entity-cards, widgets). The Home dashboard is a bento. Workspace landing pages are bentos. 3. **Workspaces** — full lenses with profiles, views, a bento, and seed entities. The biggest building block. 4. **New cell types** (Capability B) — AI can define entirely new rendering cells when no existing widget covers the need. Cells run in a sandboxed iframe. Pod-global cells (no `workspaceId`) are available immediately in all workspaces without a proposal step. ```json POST /api/hub/cells/define { "name": "Burndown Chart", "rendererSource": "…", "typeKey": "burndown-chart", "description": "Sprint burndown over task completions", "defaultSize": { "w": 8, "h": 6 }, "deps": { "recharts": "2.12.0" } } ``` - `deps` pins npm packages for the esm.sh import map. Keys are npm package names; values are version strings. Max 30 entries. React 19 is always available — never put it in `deps`. - Always `GET /api/hub/widget-definitions` first — if a cell already covers the need, use it. New cell definitions are permanent; only create when genuinely novel. - For the full in-frame query/mutate/shell-actions API see the `synap` skill's **ViewFrame Cells** section (or load `synap-ui:SKILL` via `GET /api/hub/skills/system?sections=synap-ui:SKILL`).