diff --git a/packages/app/src/components/chat/ChatMessage.vue b/packages/app/src/components/chat/ChatMessage.vue
index 44ccd43e..0b4d2d29 100644
--- a/packages/app/src/components/chat/ChatMessage.vue
+++ b/packages/app/src/components/chat/ChatMessage.vue
@@ -214,6 +214,15 @@
         />
       </div>
 
+      <div v-if="runnableCodeBlocks.length > 0" class="mt-3 space-y-2" @click.stop>
+        <CodeRunner
+          v-for="(block, i) in runnableCodeBlocks"
+          :key="`code-${i}`"
+          :code="block.code"
+          :language="block.language"
+        />
+      </div>
+
       <div v-if="inlineNewsLinks.length > 0" class="mt-3 space-y-1" @click.stop>
         <NewsCard
           v-for="(link, i) in inlineNewsLinks"
@@ -362,7 +371,9 @@ import RecipeCard from '@/components/renderers/RecipeCard.vue'
 import EventCard from '@/components/renderers/EventCard.vue'
 import InteractiveTable from '@/components/renderers/InteractiveTable.vue'
 import TimelineRenderer from '@/components/renderers/TimelineRenderer.vue'
+import CodeRunner from '@/components/renderers/CodeRunner.vue'
 import { extractTables } from '@/composables/useTableExtractor'
+import { extractRunnableCodeBlocks } from '@/composables/useCodeBlockExtractor'
 
 const props = withDefaults(
   defineProps<{
@@ -470,6 +481,11 @@ const inlineEvents = computed(() => {
   return extractEvents(props.message.content)
 })
 
+const runnableCodeBlocks = computed(() => {
+  if (isUser.value) return []
+  return extractRunnableCodeBlocks(props.message.content)
+})
+
 const isCodeResponse = computed(() =>
   !isUser.value && props.triggeringQuery.trim().toLowerCase() === '/code'
 )
diff --git a/packages/app/src/components/renderers/CodeRunner.vue b/packages/app/src/components/renderers/CodeRunner.vue
new file mode 100644
index 00000000..fb0e0480
--- /dev/null
+++ b/packages/app/src/components/renderers/CodeRunner.vue
@@ -0,0 +1,133 @@
+<template>
+  <div class="code-runner rounded-xl bg-white/5 border border-white/10 overflow-hidden">
+    <!-- Toolbar -->
+    <div class="flex items-center gap-2 px-3 py-2 border-b border-white/5">
+      <span class="text-[10px] text-white/30 uppercase tracking-wider">{{ language }}</span>
+      <div class="flex-1" />
+      <button
+        class="text-[10px] px-2.5 py-1 rounded bg-accent/15 text-accent/80 hover:bg-accent/25 transition-colors"
+        @click="runCode"
+      >
+        Run
+      </button>
+      <button
+        v-if="consoleOutput.length > 0"
+        class="text-[10px] px-2 py-1 rounded bg-white/5 text-white/40 hover:text-white/60 hover:bg-white/10 transition-colors"
+        @click="clearOutput"
+      >
+        Clear
+      </button>
+    </div>
+
+    <!-- Code display -->
+    <pre class="px-3 py-2 text-xs text-white/70 overflow-x-auto max-h-48 bg-black/20"><code>{{ code }}</code></pre>
+
+    <!-- Output iframe (hidden, used for execution) -->
+    <iframe
+      v-if="showIframe"
+      ref="iframeRef"
+      :srcdoc="srcdoc"
+      sandbox="allow-scripts"
+      class="w-full border-t border-white/5"
+      :class="isHtml ? 'h-48' : 'h-0 invisible'"
+      title="Code output"
+    />
+
+    <!-- Console output -->
+    <div
+      v-if="consoleOutput.length > 0"
+      class="border-t border-white/5 bg-black/30 px-3 py-2 max-h-32 overflow-y-auto"
+    >
+      <p class="text-[9px] text-white/20 uppercase tracking-wider mb-1">Console</p>
+      <div
+        v-for="(entry, i) in consoleOutput"
+        :key="i"
+        class="text-[11px] font-mono leading-relaxed"
+        :class="entry.type === 'error' ? 'text-red-400/80' : 'text-white/60'"
+      >
+        {{ entry.text }}
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, computed, onMounted, onBeforeUnmount } from 'vue'
+
+const props = defineProps<{
+  code: string
+  language: string
+}>()
+
+interface ConsoleEntry {
+  type: 'log' | 'error'
+  text: string
+}
+
+const consoleOutput = ref<ConsoleEntry[]>([])
+const showIframe = ref(false)
+const iframeRef = ref<HTMLIFrameElement | null>(null)
+
+const isHtml = computed(() => props.language === 'html')
+
+const srcdoc = computed(() => {
+  if (isHtml.value) {
+    // For HTML, wrap with console capture
+    return `<!DOCTYPE html>
+<html><head><style>body{background:#0a0a0a;color:#e0e0e0;font-family:system-ui;margin:8px}</style>
+<script>
+const _post = (type, args) => parent.postMessage({type:'code-runner-console',level:type,text:args.map(a=>typeof a==='object'?JSON.stringify(a):String(a)).join(' ')},'*');
+console.log = (...a) => _post('log', a);
+console.error = (...a) => _post('error', a);
+window.onerror = (m) => _post('error', [m]);
+<\/script></head><body>${props.code}</body></html>`
+  }
+
+  // For JS/CSS, wrap in HTML
+  if (props.language === 'javascript' || props.language === 'js') {
+    return `<!DOCTYPE html><html><head>
+<script>
+const _post = (type, args) => parent.postMessage({type:'code-runner-console',level:type,text:args.map(a=>typeof a==='object'?JSON.stringify(a):String(a)).join(' ')},'*');
+console.log = (...a) => _post('log', a);
+console.error = (...a) => _post('error', a);
+window.onerror = (m) => _post('error', [m]);
+<\/script></head><body><script>${props.code}<\/script></body></html>`
+  }
+
+  if (props.language === 'css') {
+    return `<!DOCTYPE html><html><head><style>${props.code}</style></head><body style="background:#0a0a0a"><div style="padding:16px;color:#e0e0e0;font-family:system-ui">CSS Preview</div></body></html>`
+  }
+
+  return ''
+})
+
+function runCode() {
+  consoleOutput.value = []
+  showIframe.value = false
+  // Force re-mount iframe
+  requestAnimationFrame(() => {
+    showIframe.value = true
+  })
+}
+
+function clearOutput() {
+  consoleOutput.value = []
+}
+
+function handleMessage(e: MessageEvent) {
+  if (e.data?.type === 'code-runner-console') {
+    consoleOutput.value.push({
+      type: e.data.level === 'error' ? 'error' : 'log',
+      text: e.data.text,
+    })
+  }
+}
+
+onMounted(() => {
+  window.addEventListener('message', handleMessage)
+})
+
+onBeforeUnmount(() => {
+  window.removeEventListener('message', handleMessage)
+})
+</script>
diff --git a/packages/app/src/composables/useCodeBlockExtractor.ts b/packages/app/src/composables/useCodeBlockExtractor.ts
new file mode 100644
index 00000000..4f5e4ee1
--- /dev/null
+++ b/packages/app/src/composables/useCodeBlockExtractor.ts
@@ -0,0 +1,32 @@
+/**
+ * Extract runnable code blocks (HTML, JS, CSS) from markdown text.
+ */
+
+export interface CodeBlock {
+  language: string
+  code: string
+}
+
+const RUNNABLE_LANGS = new Set(['html', 'javascript', 'js', 'css'])
+
+const FENCED_CODE_RE = /```(html|javascript|js|css)\n([\s\S]*?)```/gi
+
+export function extractRunnableCodeBlocks(text: string): CodeBlock[] {
+  const results: CodeBlock[] = []
+  let m: RegExpExecArray | null
+  const re = new RegExp(FENCED_CODE_RE.source, FENCED_CODE_RE.flags)
+
+  while ((m = re.exec(text)) !== null) {
+    const language = m[1].toLowerCase()
+    const code = m[2].trim()
+    if (RUNNABLE_LANGS.has(language) && code.length > 0) {
+      results.push({ language, code })
+    }
+  }
+
+  return results
+}
+
+export function hasRunnableCode(text: string): boolean {
+  return FENCED_CODE_RE.test(text)
+}