diff --git a/src/plugins/bundled/index.ts b/src/plugins/bundled/index.ts
index 85dda6519..ab8e2f77d 100644
--- a/src/plugins/bundled/index.ts
+++ b/src/plugins/bundled/index.ts
@@ -14,10 +14,11 @@
  * 2. Call registerBuiltinPlugin() with the plugin definition here
  */
 
+import { registerWeixinBuiltinPlugin } from './weixin.js'
+
 /**
  * Initialize built-in plugins. Called during CLI startup.
  */
 export function initBuiltinPlugins(): void {
-  // No built-in plugins registered yet — this is the scaffolding for
-  // migrating bundled skills that should be user-toggleable.
+  registerWeixinBuiltinPlugin()
 }
diff --git a/src/plugins/bundled/weixin.ts b/src/plugins/bundled/weixin.ts
new file mode 100644
index 000000000..2a37b86ab
--- /dev/null
+++ b/src/plugins/bundled/weixin.ts
@@ -0,0 +1,21 @@
+import { registerBuiltinPlugin } from '../builtinPlugins.js'
+import { buildCliLaunch } from '../../utils/cliLaunch.js'
+
+export function registerWeixinBuiltinPlugin(): void {
+  const launch = buildCliLaunch(['weixin', 'serve'])
+
+  registerBuiltinPlugin({
+    name: 'weixin',
+    description:
+      'WeChat channel integration. Enables inbound WeChat messages via channels and provides reply/send_typing MCP tools. Configure with `ccb weixin login` and enable for a session with `--channels plugin:weixin@builtin`.',
+    version: MACRO.VERSION,
+    defaultEnabled: true,
+    mcpServers: {
+      weixin: {
+        type: 'stdio',
+        command: launch.execPath,
+        args: launch.args,
+      },
+    },
+  })
+}
diff --git a/src/services/mcp/__tests__/channelAllowlist.test.ts b/src/services/mcp/__tests__/channelAllowlist.test.ts
new file mode 100644
index 000000000..ed2907204
--- /dev/null
+++ b/src/services/mcp/__tests__/channelAllowlist.test.ts
@@ -0,0 +1,17 @@
+import { describe, expect, mock, test } from 'bun:test'
+
+mock.module('../../analytics/growthbook.js', () => ({
+  getFeatureValue_CACHED_MAY_BE_STALE: () => [],
+}))
+
+import { isChannelAllowlisted } from '../channelAllowlist.js'
+
+describe('isChannelAllowlisted', () => {
+  test('allows builtin weixin plugin', () => {
+    expect(isChannelAllowlisted('weixin@builtin')).toBe(true)
+  })
+
+  test('rejects undefined plugin source', () => {
+    expect(isChannelAllowlisted(undefined)).toBe(false)
+  })
+})
diff --git a/src/services/mcp/channelAllowlist.ts b/src/services/mcp/channelAllowlist.ts
index 11a48a519..9a5e25f92 100644
--- a/src/services/mcp/channelAllowlist.ts
+++ b/src/services/mcp/channelAllowlist.ts
@@ -16,6 +16,7 @@
  */
 
 import { z } from 'zod/v4'
+import { BUILTIN_MARKETPLACE_NAME } from '../../plugins/builtinPlugins.js'
 import { lazySchema } from '../../utils/lazySchema.js'
 import { parsePluginIdentifier } from '../../utils/plugins/pluginIdentifier.js'
 import { getFeatureValue_CACHED_MAY_BE_STALE } from '../analytics/growthbook.js'
@@ -68,6 +69,9 @@ export function isChannelAllowlisted(
   if (!pluginSource) return false
   const { name, marketplace } = parsePluginIdentifier(pluginSource)
   if (!marketplace) return false
+   if (marketplace === BUILTIN_MARKETPLACE_NAME && name === 'weixin') {
+    return true
+  }
   return getChannelAllowlist().some(
     e => e.plugin === name && e.marketplace === marketplace,
   )