diff --git a/examples/mastra-chat/src/generated/system-prompt.txt b/examples/mastra-chat/src/generated/system-prompt.txt
index af8c67770..cbd28d059 100644
--- a/examples/mastra-chat/src/generated/system-prompt.txt
+++ b/examples/mastra-chat/src/generated/system-prompt.txt
@@ -31,7 +31,7 @@ Separator(orientation?: "horizontal" | "vertical", decorative?: boolean) — Vis
 
 ### Tables
 Table(columns: Col[]) — Data table — column-oriented. Each Col holds its own data array.
-Col(label: string, data, type?: "string" | "number" | "action") — Column definition — holds label + data array
+Col(label: string, data: any, type?: "string" | "number" | "action") — Column definition — holds label + data array
 
 ### Charts (2D)
 BarChart(labels: string[], series: Series[], variant?: "grouped" | "stacked", xLabel?: string, yLabel?: string) — Vertical bars; use for comparing values across categories with one or more series
@@ -42,7 +42,7 @@ HorizontalBarChart(labels: string[], series: Series[], variant?: "grouped" | "st
 Series(category: string, values: number[]) — One data series
 
 ### Charts (1D)
-PieChart(labels: string[], values: number[], variant?: "pie" | "donut") — Circular slices; use plucked arrays: PieChart(data.categories, data.values)
+PieChart(labels: string[], values: number[], variant?: "pie" | "donut", appearance?: "circular" | "semiCircular") — Circular slices; use plucked arrays: PieChart(data.categories, data.values)
 RadialChart(labels: string[], values: number[]) — Radial bars; use plucked arrays: RadialChart(data.categories, data.values)
 SingleStackedBarChart(labels: string[], values: number[]) — Single horizontal stacked bar; use plucked arrays: SingleStackedBarChart(data.categories, data.values)
 Slice(category: string, value: number) — One slice with label and numeric value
@@ -53,20 +53,20 @@ ScatterSeries(name: string, points: Point[]) — Named dataset
 Point(x: number, y: number, z?: number) — Data point with numeric coordinates
 
 ### Forms
-Form(name: string, buttons: Buttons, fields) — Form container with fields and explicit action buttons
+Form(name: string, buttons: Buttons, fields?: FormControl[]) — Form container with fields and explicit action buttons
 FormControl(label: string, input: Input | TextArea | Select | DatePicker | Slider | CheckBoxGroup | RadioGroup, hint?: string) — Field with label, input component, and optional hint text
 Label(text: string) — Text label
 Input(name: string, placeholder?: string, type?: "text" | "email" | "password" | "number" | "url", rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<string>)
 TextArea(name: string, placeholder?: string, rows?: number, rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<string>)
-Select(name: string, items: SelectItem[], placeholder?: string, rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<string>)
+Select(name: string, items: SelectItem[], placeholder?: string, rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<string>, size?: "small" | "medium" | "large")
 SelectItem(value: string, label: string) — Option for Select
-DatePicker(name: string, mode?: "single" | "range", rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?)
+DatePicker(name: string, mode?: "single" | "range", rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<any>)
 Slider(name: string, variant: "continuous" | "discrete", min: number, max: number, step?: number, defaultValue?: number[], label?: string, rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<number[]>) — Numeric slider input; supports continuous and discrete (stepped) variants
-CheckBoxGroup(name: string, items: CheckBoxItem[], rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?)
+CheckBoxGroup(name: string, items: CheckBoxItem[], rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<Record<string, boolean>>)
 CheckBoxItem(label: string, description: string, name: string, defaultChecked?: boolean)
 RadioGroup(name: string, items: RadioItem[], defaultValue?: string, rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<string>)
 RadioItem(label: string, description: string, value: string)
-SwitchGroup(name: string, items: SwitchItem[], variant?: "clear" | "card" | "sunk", value?) — Group of switch toggles
+SwitchGroup(name: string, items: SwitchItem[], variant?: "clear" | "card" | "sunk", value?: $binding<Record<string, boolean>>) — Group of switch toggles
 SwitchItem(label?: string, description?: string, name: string, defaultChecked?: boolean) — Individual switch toggle
 - Define EACH FormControl as its own reference — do NOT inline all controls in one array.
 - NEVER nest Form inside Form.
diff --git a/examples/multi-agent-chat/src/generated/system-prompt.txt b/examples/multi-agent-chat/src/generated/system-prompt.txt
index af8c67770..cbd28d059 100644
--- a/examples/multi-agent-chat/src/generated/system-prompt.txt
+++ b/examples/multi-agent-chat/src/generated/system-prompt.txt
@@ -31,7 +31,7 @@ Separator(orientation?: "horizontal" | "vertical", decorative?: boolean) — Vis
 
 ### Tables
 Table(columns: Col[]) — Data table — column-oriented. Each Col holds its own data array.
-Col(label: string, data, type?: "string" | "number" | "action") — Column definition — holds label + data array
+Col(label: string, data: any, type?: "string" | "number" | "action") — Column definition — holds label + data array
 
 ### Charts (2D)
 BarChart(labels: string[], series: Series[], variant?: "grouped" | "stacked", xLabel?: string, yLabel?: string) — Vertical bars; use for comparing values across categories with one or more series
@@ -42,7 +42,7 @@ HorizontalBarChart(labels: string[], series: Series[], variant?: "grouped" | "st
 Series(category: string, values: number[]) — One data series
 
 ### Charts (1D)
-PieChart(labels: string[], values: number[], variant?: "pie" | "donut") — Circular slices; use plucked arrays: PieChart(data.categories, data.values)
+PieChart(labels: string[], values: number[], variant?: "pie" | "donut", appearance?: "circular" | "semiCircular") — Circular slices; use plucked arrays: PieChart(data.categories, data.values)
 RadialChart(labels: string[], values: number[]) — Radial bars; use plucked arrays: RadialChart(data.categories, data.values)
 SingleStackedBarChart(labels: string[], values: number[]) — Single horizontal stacked bar; use plucked arrays: SingleStackedBarChart(data.categories, data.values)
 Slice(category: string, value: number) — One slice with label and numeric value
@@ -53,20 +53,20 @@ ScatterSeries(name: string, points: Point[]) — Named dataset
 Point(x: number, y: number, z?: number) — Data point with numeric coordinates
 
 ### Forms
-Form(name: string, buttons: Buttons, fields) — Form container with fields and explicit action buttons
+Form(name: string, buttons: Buttons, fields?: FormControl[]) — Form container with fields and explicit action buttons
 FormControl(label: string, input: Input | TextArea | Select | DatePicker | Slider | CheckBoxGroup | RadioGroup, hint?: string) — Field with label, input component, and optional hint text
 Label(text: string) — Text label
 Input(name: string, placeholder?: string, type?: "text" | "email" | "password" | "number" | "url", rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<string>)
 TextArea(name: string, placeholder?: string, rows?: number, rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<string>)
-Select(name: string, items: SelectItem[], placeholder?: string, rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<string>)
+Select(name: string, items: SelectItem[], placeholder?: string, rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<string>, size?: "small" | "medium" | "large")
 SelectItem(value: string, label: string) — Option for Select
-DatePicker(name: string, mode?: "single" | "range", rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?)
+DatePicker(name: string, mode?: "single" | "range", rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<any>)
 Slider(name: string, variant: "continuous" | "discrete", min: number, max: number, step?: number, defaultValue?: number[], label?: string, rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<number[]>) — Numeric slider input; supports continuous and discrete (stepped) variants
-CheckBoxGroup(name: string, items: CheckBoxItem[], rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?)
+CheckBoxGroup(name: string, items: CheckBoxItem[], rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<Record<string, boolean>>)
 CheckBoxItem(label: string, description: string, name: string, defaultChecked?: boolean)
 RadioGroup(name: string, items: RadioItem[], defaultValue?: string, rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<string>)
 RadioItem(label: string, description: string, value: string)
-SwitchGroup(name: string, items: SwitchItem[], variant?: "clear" | "card" | "sunk", value?) — Group of switch toggles
+SwitchGroup(name: string, items: SwitchItem[], variant?: "clear" | "card" | "sunk", value?: $binding<Record<string, boolean>>) — Group of switch toggles
 SwitchItem(label?: string, description?: string, name: string, defaultChecked?: boolean) — Individual switch toggle
 - Define EACH FormControl as its own reference — do NOT inline all controls in one array.
 - NEVER nest Form inside Form.
diff --git a/examples/openui-chat/src/generated/system-prompt.txt b/examples/openui-chat/src/generated/system-prompt.txt
index 5a066bbaf..cbd28d059 100644
--- a/examples/openui-chat/src/generated/system-prompt.txt
+++ b/examples/openui-chat/src/generated/system-prompt.txt
@@ -42,7 +42,7 @@ HorizontalBarChart(labels: string[], series: Series[], variant?: "grouped" | "st
 Series(category: string, values: number[]) — One data series
 
 ### Charts (1D)
-PieChart(labels: string[], values: number[], variant?: "pie" | "donut") — Circular slices; use plucked arrays: PieChart(data.categories, data.values)
+PieChart(labels: string[], values: number[], variant?: "pie" | "donut", appearance?: "circular" | "semiCircular") — Circular slices; use plucked arrays: PieChart(data.categories, data.values)
 RadialChart(labels: string[], values: number[]) — Radial bars; use plucked arrays: RadialChart(data.categories, data.values)
 SingleStackedBarChart(labels: string[], values: number[]) — Single horizontal stacked bar; use plucked arrays: SingleStackedBarChart(data.categories, data.values)
 Slice(category: string, value: number) — One slice with label and numeric value
diff --git a/examples/vercel-ai-chat/src/generated/system-prompt.txt b/examples/vercel-ai-chat/src/generated/system-prompt.txt
index af8c67770..cbd28d059 100644
--- a/examples/vercel-ai-chat/src/generated/system-prompt.txt
+++ b/examples/vercel-ai-chat/src/generated/system-prompt.txt
@@ -31,7 +31,7 @@ Separator(orientation?: "horizontal" | "vertical", decorative?: boolean) — Vis
 
 ### Tables
 Table(columns: Col[]) — Data table — column-oriented. Each Col holds its own data array.
-Col(label: string, data, type?: "string" | "number" | "action") — Column definition — holds label + data array
+Col(label: string, data: any, type?: "string" | "number" | "action") — Column definition — holds label + data array
 
 ### Charts (2D)
 BarChart(labels: string[], series: Series[], variant?: "grouped" | "stacked", xLabel?: string, yLabel?: string) — Vertical bars; use for comparing values across categories with one or more series
@@ -42,7 +42,7 @@ HorizontalBarChart(labels: string[], series: Series[], variant?: "grouped" | "st
 Series(category: string, values: number[]) — One data series
 
 ### Charts (1D)
-PieChart(labels: string[], values: number[], variant?: "pie" | "donut") — Circular slices; use plucked arrays: PieChart(data.categories, data.values)
+PieChart(labels: string[], values: number[], variant?: "pie" | "donut", appearance?: "circular" | "semiCircular") — Circular slices; use plucked arrays: PieChart(data.categories, data.values)
 RadialChart(labels: string[], values: number[]) — Radial bars; use plucked arrays: RadialChart(data.categories, data.values)
 SingleStackedBarChart(labels: string[], values: number[]) — Single horizontal stacked bar; use plucked arrays: SingleStackedBarChart(data.categories, data.values)
 Slice(category: string, value: number) — One slice with label and numeric value
@@ -53,20 +53,20 @@ ScatterSeries(name: string, points: Point[]) — Named dataset
 Point(x: number, y: number, z?: number) — Data point with numeric coordinates
 
 ### Forms
-Form(name: string, buttons: Buttons, fields) — Form container with fields and explicit action buttons
+Form(name: string, buttons: Buttons, fields?: FormControl[]) — Form container with fields and explicit action buttons
 FormControl(label: string, input: Input | TextArea | Select | DatePicker | Slider | CheckBoxGroup | RadioGroup, hint?: string) — Field with label, input component, and optional hint text
 Label(text: string) — Text label
 Input(name: string, placeholder?: string, type?: "text" | "email" | "password" | "number" | "url", rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<string>)
 TextArea(name: string, placeholder?: string, rows?: number, rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<string>)
-Select(name: string, items: SelectItem[], placeholder?: string, rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<string>)
+Select(name: string, items: SelectItem[], placeholder?: string, rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<string>, size?: "small" | "medium" | "large")
 SelectItem(value: string, label: string) — Option for Select
-DatePicker(name: string, mode?: "single" | "range", rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?)
+DatePicker(name: string, mode?: "single" | "range", rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<any>)
 Slider(name: string, variant: "continuous" | "discrete", min: number, max: number, step?: number, defaultValue?: number[], label?: string, rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<number[]>) — Numeric slider input; supports continuous and discrete (stepped) variants
-CheckBoxGroup(name: string, items: CheckBoxItem[], rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?)
+CheckBoxGroup(name: string, items: CheckBoxItem[], rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<Record<string, boolean>>)
 CheckBoxItem(label: string, description: string, name: string, defaultChecked?: boolean)
 RadioGroup(name: string, items: RadioItem[], defaultValue?: string, rules?: {required?: boolean, email?: boolean, url?: boolean, numeric?: boolean, min?: number, max?: number, minLength?: number, maxLength?: number, pattern?: string}, value?: $binding<string>)
 RadioItem(label: string, description: string, value: string)
-SwitchGroup(name: string, items: SwitchItem[], variant?: "clear" | "card" | "sunk", value?) — Group of switch toggles
+SwitchGroup(name: string, items: SwitchItem[], variant?: "clear" | "card" | "sunk", value?: $binding<Record<string, boolean>>) — Group of switch toggles
 SwitchItem(label?: string, description?: string, name: string, defaultChecked?: boolean) — Individual switch toggle
 - Define EACH FormControl as its own reference — do NOT inline all controls in one array.
 - NEVER nest Form inside Form.
diff --git a/packages/lang-core/src/parser/prompt.ts b/packages/lang-core/src/parser/prompt.ts
index f28ef5b25..e6688bc0a 100644
--- a/packages/lang-core/src/parser/prompt.ts
+++ b/packages/lang-core/src/parser/prompt.ts
@@ -431,7 +431,6 @@ function importantRules(
   }
 
   return `## Important Rules
-- When asked about data, generate realistic/plausible data
 - Choose components that best represent the content (tables for comparisons, charts for trends, forms for input, etc.)
 
 ## Final Verification
diff --git a/packages/react-email/src/library.ts b/packages/react-email/src/library.ts
index bc73998c9..fdf4071c5 100644
--- a/packages/react-email/src/library.ts
+++ b/packages/react-email/src/library.ts
@@ -392,6 +392,7 @@ si2 = EmailSocialIcon("https://react.email/static/instagram-logo.png", "Instagra
 // ── Additional rules (email only) ──
 
 export const emailAdditionalRules: string[] = [
+  "When asked about data, generate realistic/plausible data",
   "You are an expert email designer using react-email components.",
   "The 10 supported email types are: Welcome/Onboarding, Newsletter, Order Confirmation, Password Reset, Promotional/Sale, Event Invitation, Feedback Request, Shipping/Delivery Update, Account Verification, Onboarding Tutorial.",
   "Use realistic, professional placeholder text — never use lorem ipsum.",
diff --git a/packages/react-ui/src/genui-lib/openuiChatLibrary.tsx b/packages/react-ui/src/genui-lib/openuiChatLibrary.tsx
index 73b9f3404..362a57428 100644
--- a/packages/react-ui/src/genui-lib/openuiChatLibrary.tsx
+++ b/packages/react-ui/src/genui-lib/openuiChatLibrary.tsx
@@ -265,6 +265,7 @@ btns = Buttons([Button("Submit", Action([@ToAssistant("Submit")]), "primary")])`
 ];
 
 export const openuiChatAdditionalRules: string[] = [
+  "When asked about data, generate realistic/plausible data",
   "Every response is a single Card(children) — children stack vertically automatically. No layout params are needed on Card.",
   "Card is the only layout container. Do NOT use Stack. Use Tabs to switch between sections, Carousel for horizontal scroll.",
   "Use FollowUpBlock at the END of a Card to suggest what the user can do or ask next.",
diff --git a/packages/react-ui/src/genui-lib/openuiLibrary.tsx b/packages/react-ui/src/genui-lib/openuiLibrary.tsx
index 048c09854..f456d389e 100644
--- a/packages/react-ui/src/genui-lib/openuiLibrary.tsx
+++ b/packages/react-ui/src/genui-lib/openuiLibrary.tsx
@@ -246,6 +246,7 @@ vueContent = [TextContent("Vue is a progressive framework by Evan You."), Callou
 ];
 
 export const openuiAdditionalRules: string[] = [
+  "When asked about data, generate realistic/plausible data",
   'For grid-like layouts, use Stack with direction "row" and wrap=true. Avoid justify="between" unless you specifically want large gutters.',
   "For forms, define one FormControl reference per field so controls can stream progressively.",
   "For forms, always provide the second Form argument with Buttons(...) actions: Form(name, buttons, fields).",