diff --git a/src/design-system/primitives/Avatar/Avatar.module.css b/src/design-system/primitives/Avatar/Avatar.module.css
new file mode 100644
index 0000000..8e10927
--- /dev/null
+++ b/src/design-system/primitives/Avatar/Avatar.module.css
@@ -0,0 +1,12 @@
+.avatar {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  border-radius: 50%;
+  font-weight: 600;
+  border: 1px solid;
+  flex-shrink: 0;
+}
+.sm { width: 24px; height: 24px; font-size: 9px; }
+.md { width: 28px; height: 28px; font-size: 11px; }
+.lg { width: 40px; height: 40px; font-size: 14px; }
diff --git a/src/design-system/primitives/Avatar/Avatar.tsx b/src/design-system/primitives/Avatar/Avatar.tsx
new file mode 100644
index 0000000..109ad8e
--- /dev/null
+++ b/src/design-system/primitives/Avatar/Avatar.tsx
@@ -0,0 +1,29 @@
+import styles from './Avatar.module.css'
+import { hashColor } from '../../utils/hashColor'
+import { useTheme } from '../../providers/ThemeProvider'
+
+interface AvatarProps {
+  name: string
+  size?: 'sm' | 'md' | 'lg'
+  className?: string
+}
+
+function getInitials(name: string): string {
+  const parts = name.split(/[\s-]+/).filter(Boolean)
+  if (parts.length >= 2) return (parts[0][0] + parts[1][0]).toUpperCase()
+  return name.slice(0, 2).toUpperCase()
+}
+
+export function Avatar({ name, size = 'md', className }: AvatarProps) {
+  const { theme } = useTheme()
+  const colors = hashColor(name, theme)
+  return (
+    <span
+      className={`${styles.avatar} ${styles[size]} ${className ?? ''}`}
+      style={{ backgroundColor: colors.bg, color: colors.text, borderColor: colors.border }}
+      aria-label={name}
+    >
+      {getInitials(name)}
+    </span>
+  )
+}
diff --git a/src/design-system/primitives/Badge/Badge.module.css b/src/design-system/primitives/Badge/Badge.module.css
new file mode 100644
index 0000000..baf9777
--- /dev/null
+++ b/src/design-system/primitives/Badge/Badge.module.css
@@ -0,0 +1,43 @@
+.badge {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  padding: 1px 8px;
+  border-radius: 10px;
+  font-family: var(--font-mono);
+  font-size: 10px;
+  font-weight: 600;
+  white-space: nowrap;
+  border: 1px solid transparent;
+  text-transform: uppercase;
+  letter-spacing: 0.3px;
+}
+
+.filled { /* default — inline styles from hashColor or semantic class */ }
+
+.outlined {
+  background: transparent !important;
+}
+
+.dashed {
+  background: transparent !important;
+  border-style: dashed;
+}
+
+.primary { background: var(--amber-bg); color: var(--amber-deep); border-color: var(--amber-light); }
+.success { background: var(--success-bg); color: var(--success); border-color: var(--success-border); }
+.warning { background: var(--warning-bg); color: var(--warning); border-color: var(--warning-border); }
+.error { background: var(--error-bg); color: var(--error); border-color: var(--error-border); }
+.running { background: var(--running-bg); color: var(--running); border-color: var(--running-border); }
+
+.remove {
+  background: none;
+  border: none;
+  color: inherit;
+  cursor: pointer;
+  font-size: 12px;
+  line-height: 1;
+  opacity: 0.5;
+  padding: 0;
+}
+.remove:hover { opacity: 1; }
diff --git a/src/design-system/primitives/Badge/Badge.test.tsx b/src/design-system/primitives/Badge/Badge.test.tsx
new file mode 100644
index 0000000..6c02041
--- /dev/null
+++ b/src/design-system/primitives/Badge/Badge.test.tsx
@@ -0,0 +1,43 @@
+import { describe, it, expect } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import { ThemeProvider } from '../../providers/ThemeProvider'
+import { Badge } from './Badge'
+
+describe('Badge', () => {
+  it('renders label text', () => {
+    render(
+      <ThemeProvider>
+        <Badge label="VIEWER" />
+      </ThemeProvider>,
+    )
+    expect(screen.getByText('VIEWER')).toBeInTheDocument()
+  })
+
+  it('applies inline hash color when color is auto', () => {
+    const { container } = render(
+      <ThemeProvider>
+        <Badge label="VIEWER" color="auto" />
+      </ThemeProvider>,
+    )
+    const badge = container.firstChild as HTMLElement
+    expect(badge.style.backgroundColor).toBeTruthy()
+  })
+
+  it('applies semantic color class when specified', () => {
+    const { container } = render(
+      <ThemeProvider>
+        <Badge label="Failed" color="error" />
+      </ThemeProvider>,
+    )
+    expect(container.firstChild).toHaveClass('error')
+  })
+
+  it('applies dashed variant class', () => {
+    const { container } = render(
+      <ThemeProvider>
+        <Badge label="inherited" variant="dashed" />
+      </ThemeProvider>,
+    )
+    expect(container.firstChild).toHaveClass('dashed')
+  })
+})
diff --git a/src/design-system/primitives/Badge/Badge.tsx b/src/design-system/primitives/Badge/Badge.tsx
new file mode 100644
index 0000000..335b784
--- /dev/null
+++ b/src/design-system/primitives/Badge/Badge.tsx
@@ -0,0 +1,52 @@
+import styles from './Badge.module.css'
+import { hashColor } from '../../utils/hashColor'
+import { useTheme } from '../../providers/ThemeProvider'
+
+type BadgeColor = 'primary' | 'success' | 'warning' | 'error' | 'running' | 'auto'
+type BadgeVariant = 'filled' | 'outlined' | 'dashed'
+
+interface BadgeProps {
+  label: string
+  variant?: BadgeVariant
+  color?: BadgeColor
+  onRemove?: () => void
+  className?: string
+}
+
+export function Badge({
+  label,
+  variant = 'filled',
+  color = 'auto',
+  onRemove,
+  className,
+}: BadgeProps) {
+  const { theme } = useTheme()
+  const isAuto = color === 'auto'
+  const hashColors = isAuto ? hashColor(label, theme) : null
+
+  const inlineStyle = isAuto
+    ? {
+        backgroundColor: variant === 'filled' ? hashColors!.bg : 'transparent',
+        color: hashColors!.text,
+        borderColor: hashColors!.border,
+      }
+    : undefined
+
+  const classes = [
+    styles.badge,
+    styles[variant],
+    !isAuto ? styles[color] : '',
+    className ?? '',
+  ].filter(Boolean).join(' ')
+
+  return (
+    <span className={classes} style={inlineStyle}>
+      {label}
+      {onRemove && (
+        <button className={styles.remove} onClick={onRemove} aria-label={`Remove ${label}`}>
+          &times;
+        </button>
+      )}
+    </span>
+  )
+}
diff --git a/src/design-system/primitives/Tag/Tag.module.css b/src/design-system/primitives/Tag/Tag.module.css
new file mode 100644
index 0000000..9406933
--- /dev/null
+++ b/src/design-system/primitives/Tag/Tag.module.css
@@ -0,0 +1,28 @@
+.tag {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  padding: 3px 10px;
+  border: 1px solid;
+  border-radius: 20px;
+  font-size: 11px;
+  font-family: var(--font-mono);
+}
+
+.primary { background: var(--amber-bg); color: var(--amber-deep); border-color: var(--amber-light); }
+.success { background: var(--success-bg); color: var(--success); border-color: var(--success-border); }
+.warning { background: var(--warning-bg); color: var(--warning); border-color: var(--warning-border); }
+.error { background: var(--error-bg); color: var(--error); border-color: var(--error-border); }
+.running { background: var(--running-bg); color: var(--running); border-color: var(--running-border); }
+
+.remove {
+  cursor: pointer;
+  opacity: 0.5;
+  font-size: 13px;
+  line-height: 1;
+  background: none;
+  border: none;
+  color: inherit;
+  padding: 0;
+}
+.remove:hover { opacity: 1; }
diff --git a/src/design-system/primitives/Tag/Tag.tsx b/src/design-system/primitives/Tag/Tag.tsx
new file mode 100644
index 0000000..2b8bdcc
--- /dev/null
+++ b/src/design-system/primitives/Tag/Tag.tsx
@@ -0,0 +1,35 @@
+import styles from './Tag.module.css'
+import { hashColor } from '../../utils/hashColor'
+import { useTheme } from '../../providers/ThemeProvider'
+
+type TagColor = 'primary' | 'success' | 'warning' | 'error' | 'running' | 'auto'
+
+interface TagProps {
+  label: string
+  onRemove?: () => void
+  color?: TagColor
+  className?: string
+}
+
+export function Tag({ label, onRemove, color = 'auto', className }: TagProps) {
+  const { theme } = useTheme()
+  const isAuto = color === 'auto'
+  const hashColors = isAuto ? hashColor(label, theme) : null
+
+  const inlineStyle = isAuto
+    ? { backgroundColor: hashColors!.bg, color: hashColors!.text, borderColor: hashColors!.border }
+    : undefined
+
+  const classes = [styles.tag, !isAuto ? styles[color] : '', className ?? ''].filter(Boolean).join(' ')
+
+  return (
+    <span className={classes} style={inlineStyle}>
+      {label}
+      {onRemove && (
+        <button className={styles.remove} onClick={onRemove} aria-label={`Remove ${label}`}>
+          &times;
+        </button>
+      )}
+    </span>
+  )
+}