diff --git a/PLUGINS.md b/PLUGINS.md
new file mode 100644
index 0000000..9e64c90
--- /dev/null
+++ b/PLUGINS.md
@@ -0,0 +1,18 @@
+# Trakli UI plugins
+
+Set `TRAKLI_UI_LAYERS` to a comma-separated list of installed Nuxt layer paths before development or build. Paths are relative to the web UI checkout, or absolute.
+
+```bash
+TRAKLI_UI_LAYERS=/path/to/plugin/ui npm run dev
+TRAKLI_UI_LAYERS=/path/to/plugin/ui npm run build
+TRAKLI_UI_LAYERS=/path/to/plugin/ui npm run test:run
+TRAKLI_UI_LAYERS=/path/to/plugin/ui npm run check:plugins
+```
+
+Without this setting, the app loads no optional plugin layers. A layer supplies its pages, translations and optional components. Keep the matching backend plugin enabled. Installing or removing a layer requires restarting development or rebuilding the app.
+
+Backend integration descriptors insert links into the existing sidebar and settings slots. Links to local routes are hidden when the route is absent. Custom controls can still register through `useExtensionSlots().registerComponent()`.
+
+Layer pages use the host's authentication middleware, layouts, components and API client. Keep provider return URLs on the same browser hostname as the UI to preserve login cookies.
+
+Plugin tests live under the layer's `tests` directory. The host test runner includes tests from the configured layers and supplies its aliases and dependencies.
diff --git a/composables/useExtensionSlots.ts b/composables/useExtensionSlots.ts
index 45e9d13..94a8616 100644
--- a/composables/useExtensionSlots.ts
+++ b/composables/useExtensionSlots.ts
@@ -16,6 +16,7 @@ const componentRegistry = ref<Record<string, Component>>({});
  */
 export const useExtensionSlots = () => {
   const { integrations } = useIntegrations();
+  const router = useRouter();
 
   const contributionsFor = (slot: ExtensionSlot) =>
     computed<SlotContribution[]>(() => {
@@ -39,6 +40,11 @@ export const useExtensionSlots = () => {
           continue;
         }
 
+        const href = ui.onboarding?.href || ui.card?.href;
+        if (href?.startsWith('/') && !router.resolve(href).matched.length) {
+          continue;
+        }
+
         items.push({
           key: integration.key,
           slot,
diff --git a/nuxt.config.ts b/nuxt.config.ts
index ca54dc5..7c5949f 100644
--- a/nuxt.config.ts
+++ b/nuxt.config.ts
@@ -1,6 +1,11 @@
 import { defineNuxtConfig } from 'nuxt/config';
 import Icons from 'unplugin-icons/vite';
 
+const pluginLayers = (process.env.TRAKLI_UI_LAYERS || '')
+  .split(',')
+  .map((layer) => layer.trim())
+  .filter(Boolean);
+
 // https://nuxt.com/docs/api/configuration/nuxt-config
 export default defineNuxtConfig({
   vite: {
@@ -12,7 +17,7 @@ export default defineNuxtConfig({
   // A layer registers a component against a slot key with
   // useExtensionSlots().registerComponent(), and DescriptorRenderer resolves it when a
   // descriptor sets `ui.component`. That is how plugin UI reaches the app.
-  extends: ['@whilesmart/eloquent-admin-ui'],
+  extends: ['@whilesmart/eloquent-admin-ui', ...pluginLayers],
   routeRules: {
     '/ai-insights': { redirect: '/assistant' }
   },
diff --git a/package.json b/package.json
index b6b5d9b..9187f6a 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,8 @@
     "format:check": "prettier --check ./",
     "test": "vitest",
     "test:run": "vitest run",
-    "test:coverage": "vitest run --coverage"
+    "test:coverage": "vitest run --coverage",
+    "check:plugins": "node scripts/check-plugin-layers.mjs"
   },
   "dependencies": {
     "@whilesmart/eloquent-admin-ui": "^0.1.0",
diff --git a/scripts/check-plugin-layers.mjs b/scripts/check-plugin-layers.mjs
new file mode 100644
index 0000000..1fbe2b9
--- /dev/null
+++ b/scripts/check-plugin-layers.mjs
@@ -0,0 +1,49 @@
+import { readdir, readFile } from 'node:fs/promises';
+import { dirname, extname, join, relative, resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { ESLint } from 'eslint';
+import * as prettier from 'prettier';
+
+const host = resolve(dirname(fileURLToPath(import.meta.url)), '..');
+const layers = (process.env.TRAKLI_UI_LAYERS || '')
+  .split(',')
+  .map((layer) => layer.trim())
+  .filter(Boolean)
+  .map((layer) => resolve(host, layer));
+const extensions = new Set(['.ts', '.js', '.mjs', '.vue', '.json', '.md']);
+const excluded = new Set(['node_modules', '.nuxt', '.output', '.git']);
+
+async function sources(directory) {
+  const files = [];
+  for (const entry of await readdir(directory, { withFileTypes: true })) {
+    if (excluded.has(entry.name)) continue;
+    const path = join(directory, entry.name);
+    if (entry.isDirectory()) files.push(...(await sources(path)));
+    else if (extensions.has(extname(path))) files.push(path);
+  }
+  return files;
+}
+
+if (layers.length) {
+  let common = host;
+  for (const layer of layers) {
+    while (relative(common, layer).startsWith('..')) common = dirname(common);
+  }
+  const eslint = new ESLint({ cwd: common, overrideConfigFile: join(host, 'eslint.config.mjs') });
+  const results = await eslint.lintFiles(layers.map((layer) => `${layer}/**/*.{ts,js,mjs,vue}`));
+  console.log(await (await eslint.loadFormatter('stylish')).format(results));
+  if (results.some((result) => result.errorCount)) process.exitCode = 1;
+
+  const options = await prettier.resolveConfig(join(host, 'nuxt.config.ts'));
+  for (const layer of layers) {
+    for (const file of await sources(layer)) {
+      if (!(await prettier.check(await readFile(file, 'utf8'), { ...options, filepath: file }))) {
+        console.error(`Formatting failed: ${relative(host, file)}`);
+        process.exitCode = 1;
+      }
+    }
+  }
+  if (!process.exitCode) console.log('Plugin layer lint and formatting passed.');
+} else {
+  console.log('No plugin layers configured.');
+}
diff --git a/tests/composables/useExtensionSlots.test.ts b/tests/composables/useExtensionSlots.test.ts
index ecdca0f..0b8ab5b 100644
--- a/tests/composables/useExtensionSlots.test.ts
+++ b/tests/composables/useExtensionSlots.test.ts
@@ -27,6 +27,17 @@ function makeIntegration(overrides: Partial<Integration>): Integration {
 describe('useExtensionSlots', () => {
   beforeEach(() => {
     mockIntegrations.value = [];
+    vi.stubGlobal('useRouter', () => ({ resolve: () => ({ matched: [{}] }) }));
+  });
+
+  it('hides local links when their plugin route is not installed', () => {
+    vi.stubGlobal('useRouter', () => ({ resolve: () => ({ matched: [] }) }));
+    mockIntegrations.value = [
+      makeIntegration({
+        ui: { slots: ['sidebar.nav'], card: { title: 'Optional plugin', href: '/optional' } }
+      })
+    ];
+    expect(useExtensionSlots().contributionsFor('sidebar.nav').value).toEqual([]);
   });
 
   it('collects only contributions that declare the slot', () => {
diff --git a/vitest.config.ts b/vitest.config.ts
index b7ddf25..7887f42 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -3,13 +3,24 @@ import vue from '@vitejs/plugin-vue';
 import Icons from 'unplugin-icons/vite';
 import { resolve } from 'path';
 
+const pluginLayers = (process.env.TRAKLI_UI_LAYERS || '')
+  .split(',')
+  .map((layer) => layer.trim())
+  .filter(Boolean);
+
 export default defineConfig({
   plugins: [Icons({ compiler: 'vue3', autoInstall: false }), vue()],
+  server: {
+    fs: { allow: [resolve(__dirname), ...pluginLayers.map((layer) => resolve(__dirname, layer))] }
+  },
   test: {
     globals: true,
     environment: 'happy-dom',
     setupFiles: ['./tests/setup.ts'],
-    include: ['tests/**/*.{test,spec}.{js,ts}'],
+    include: [
+      'tests/**/*.{test,spec}.{js,ts}',
+      ...pluginLayers.map((layer) => `${layer}/tests/**/*.{test,spec}.{js,ts}`)
+    ],
     coverage: {
       provider: 'v8',
       reporter: ['text', 'json', 'html'],
@@ -17,6 +28,7 @@ export default defineConfig({
     }
   },
   resolve: {
+    dedupe: ['vue', '@vue/test-utils', 'vitest'],
     alias: {
       '@': resolve(__dirname, './'),
       '~': resolve(__dirname, './')