diff --git a/src/design-system/primitives/CodeBlock/CodeBlock.module.css b/src/design-system/primitives/CodeBlock/CodeBlock.module.css
new file mode 100644
index 0000000..de27d44
--- /dev/null
+++ b/src/design-system/primitives/CodeBlock/CodeBlock.module.css
@@ -0,0 +1,53 @@
+.wrapper {
+  position: relative;
+  border-radius: var(--radius-sm);
+  overflow: hidden;
+  border: 1px solid var(--border);
+}
+
+.pre {
+  margin: 0;
+  padding: 12px 14px;
+  background: var(--bg-inset);
+  font-family: var(--font-mono);
+  font-size: 12px;
+  line-height: 1.6;
+  color: var(--text-primary);
+  overflow-x: auto;
+  white-space: pre;
+}
+
+.copyBtn {
+  position: absolute;
+  top: 6px;
+  right: 8px;
+  padding: 2px 8px;
+  background: var(--bg-raised);
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  font-family: var(--font-mono);
+  font-size: 10px;
+  color: var(--text-secondary);
+  cursor: pointer;
+  transition: all 0.15s;
+  z-index: 1;
+}
+
+.copyBtn:hover {
+  border-color: var(--amber);
+  color: var(--amber);
+}
+
+.line {
+  display: block;
+}
+
+.lineNum {
+  display: inline-block;
+  width: 2.5em;
+  color: var(--text-faint);
+  user-select: none;
+  text-align: right;
+  margin-right: 12px;
+  font-size: 11px;
+}
diff --git a/src/design-system/primitives/CodeBlock/CodeBlock.test.tsx b/src/design-system/primitives/CodeBlock/CodeBlock.test.tsx
new file mode 100644
index 0000000..44257e0
--- /dev/null
+++ b/src/design-system/primitives/CodeBlock/CodeBlock.test.tsx
@@ -0,0 +1,20 @@
+import { describe, it, expect } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import { CodeBlock } from './CodeBlock'
+
+describe('CodeBlock', () => {
+  it('renders content in a pre element', () => {
+    render(<CodeBlock content='{"key": "value"}' />)
+    expect(screen.getByText(/"key"/)).toBeInTheDocument()
+  })
+
+  it('pretty-prints JSON when language is json', () => {
+    render(<CodeBlock content='{"a":1}' language="json" />)
+    expect(screen.getByText(/"a":/)).toBeInTheDocument()
+  })
+
+  it('shows copy button when copyable', () => {
+    render(<CodeBlock content="test" copyable />)
+    expect(screen.getByRole('button', { name: /copy/i })).toBeInTheDocument()
+  })
+})
diff --git a/src/design-system/primitives/CodeBlock/CodeBlock.tsx b/src/design-system/primitives/CodeBlock/CodeBlock.tsx
new file mode 100644
index 0000000..c41d17a
--- /dev/null
+++ b/src/design-system/primitives/CodeBlock/CodeBlock.tsx
@@ -0,0 +1,62 @@
+import { useState } from 'react'
+import styles from './CodeBlock.module.css'
+
+interface CodeBlockProps {
+  content: string
+  language?: string
+  copyable?: boolean
+  lineNumbers?: boolean
+  className?: string
+}
+
+export function CodeBlock({
+  content,
+  language = 'text',
+  copyable = false,
+  lineNumbers = false,
+  className,
+}: CodeBlockProps) {
+  const [copied, setCopied] = useState(false)
+
+  let formatted = content
+  if (language === 'json') {
+    try {
+      formatted = JSON.stringify(JSON.parse(content), null, 2)
+    } catch {
+      // invalid JSON — show as-is
+    }
+  }
+
+  const lines = formatted.split('\n')
+
+  function handleCopy() {
+    navigator.clipboard.writeText(formatted).then(() => {
+      setCopied(true)
+      setTimeout(() => setCopied(false), 1500)
+    })
+  }
+
+  return (
+    <div className={`${styles.wrapper} ${className ?? ''}`}>
+      {copyable && (
+        <button
+          className={styles.copyBtn}
+          onClick={handleCopy}
+          aria-label="Copy code"
+        >
+          {copied ? 'Copied!' : 'Copy'}
+        </button>
+      )}
+      <pre className={styles.pre}>
+        {lineNumbers
+          ? lines.map((line, i) => (
+              <span key={i} className={styles.line}>
+                <span className={styles.lineNum}>{i + 1}</span>
+                {line + (i < lines.length - 1 ? '\n' : '')}
+              </span>
+            ))
+          : formatted}
+      </pre>
+    </div>
+  )
+}
diff --git a/src/design-system/primitives/EmptyState/EmptyState.module.css b/src/design-system/primitives/EmptyState/EmptyState.module.css
new file mode 100644
index 0000000..7504ff5
--- /dev/null
+++ b/src/design-system/primitives/EmptyState/EmptyState.module.css
@@ -0,0 +1,32 @@
+.root {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  text-align: center;
+  padding: 40px 24px;
+  gap: 8px;
+}
+
+.icon {
+  font-size: 32px;
+  color: var(--text-faint);
+  margin-bottom: 4px;
+}
+
+.title {
+  font-size: 14px;
+  font-weight: 600;
+  color: var(--text-secondary);
+}
+
+.description {
+  font-size: 12px;
+  color: var(--text-muted);
+  max-width: 300px;
+  line-height: 1.5;
+}
+
+.action {
+  margin-top: 8px;
+}
diff --git a/src/design-system/primitives/EmptyState/EmptyState.tsx b/src/design-system/primitives/EmptyState/EmptyState.tsx
new file mode 100644
index 0000000..35fd0bc
--- /dev/null
+++ b/src/design-system/primitives/EmptyState/EmptyState.tsx
@@ -0,0 +1,21 @@
+import styles from './EmptyState.module.css'
+import type { ReactNode } from 'react'
+
+interface EmptyStateProps {
+  icon?: ReactNode
+  title: string
+  description?: string
+  action?: ReactNode
+  className?: string
+}
+
+export function EmptyState({ icon, title, description, action, className }: EmptyStateProps) {
+  return (
+    <div className={`${styles.root} ${className ?? ''}`}>
+      {icon && <div className={styles.icon}>{icon}</div>}
+      <div className={styles.title}>{title}</div>
+      {description && <div className={styles.description}>{description}</div>}
+      {action && <div className={styles.action}>{action}</div>}
+    </div>
+  )
+}
diff --git a/src/design-system/primitives/InfoCallout/InfoCallout.module.css b/src/design-system/primitives/InfoCallout/InfoCallout.module.css
new file mode 100644
index 0000000..19c3562
--- /dev/null
+++ b/src/design-system/primitives/InfoCallout/InfoCallout.module.css
@@ -0,0 +1,52 @@
+.callout {
+  padding: 10px 14px;
+  border-radius: var(--radius-sm);
+  border-left: 3px solid;
+  font-size: 12px;
+  line-height: 1.5;
+}
+
+.amber {
+  background: var(--amber-bg);
+  border-left-color: var(--amber);
+  color: var(--amber-deep);
+}
+
+.success {
+  background: var(--success-bg);
+  border-left-color: var(--success);
+  color: var(--success);
+}
+
+.warning {
+  background: var(--warning-bg);
+  border-left-color: var(--warning);
+  color: var(--warning);
+}
+
+.error {
+  background: var(--error-bg);
+  border-left-color: var(--error);
+  color: var(--error);
+}
+
+.info {
+  background: var(--running-bg);
+  border-left-color: var(--running);
+  color: var(--running);
+}
+
+.title {
+  font-weight: 600;
+  margin-bottom: 4px;
+}
+
+.body {
+  color: var(--text-secondary);
+}
+
+.amber .body { color: var(--amber-deep); }
+.success .body { color: var(--success); }
+.warning .body { color: var(--warning); }
+.error .body { color: var(--error); }
+.info .body { color: var(--running); }
diff --git a/src/design-system/primitives/InfoCallout/InfoCallout.tsx b/src/design-system/primitives/InfoCallout/InfoCallout.tsx
new file mode 100644
index 0000000..3ae55dc
--- /dev/null
+++ b/src/design-system/primitives/InfoCallout/InfoCallout.tsx
@@ -0,0 +1,25 @@
+import styles from './InfoCallout.module.css'
+import type { ReactNode } from 'react'
+
+type InfoCalloutVariant = 'amber' | 'success' | 'warning' | 'error' | 'info'
+
+interface InfoCalloutProps {
+  children: ReactNode
+  variant?: InfoCalloutVariant
+  title?: string
+  className?: string
+}
+
+export function InfoCallout({
+  children,
+  variant = 'amber',
+  title,
+  className,
+}: InfoCalloutProps) {
+  return (
+    <div className={`${styles.callout} ${styles[variant]} ${className ?? ''}`}>
+      {title && <div className={styles.title}>{title}</div>}
+      <div className={styles.body}>{children}</div>
+    </div>
+  )
+}