feat: Complete fleet — 94 skills across 10+ domains

Pulled ALL skills from 15 source repositories:
- anthropics/skills: 16 (docs, design, MCP, testing)
- obra/superpowers: 14 (TDD, debugging, agents, planning)
- coreyhaines31/marketingskills: 25 (marketing, CRO, SEO, growth)
- better-auth/skills: 5 (auth patterns)
- vercel-labs/agent-skills: 5 (React, design, Vercel)
- antfu/skills: 16 (Vue, Vite, Vitest, pnpm, Turborepo)
- Plus 13 individual skills from various repos

Mosaic Stack is not limited to coding — the Orchestrator and
subagents serve coding, business, design, marketing, writing,
logistics, analysis, and more.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

skills/pinia/GENERATION.md

@@ -0,0 +1,5 @@
+# Generation Info
+
+- **Source:** `sources/pinia`
+- **Git SHA:** `55dbfc5c20d4461748996aa74d8c0913e89fb98e`
+- **Generated:** 2026-01-28

skills/pinia/SKILL.md

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+---
+name: pinia
+description: Pinia official Vue state management library, type-safe and extensible. Use when defining stores, working with state/getters/actions, or implementing store patterns in Vue apps.
+metadata:
+  author: Anthony Fu
+  version: "2026.1.28"
+  source: Generated from https://github.com/vuejs/pinia, scripts located at https://github.com/antfu/skills
+---
+
+# Pinia
+
+Pinia is the official state management library for Vue, designed to be intuitive and type-safe. It supports both Options API and Composition API styles, with first-class TypeScript support and devtools integration.
+
+> The skill is based on Pinia v3.0.4, generated at 2026-01-28.
+
+## Core References
+
+| Topic | Description | Reference |
+|-------|-------------|-----------|
+| Stores | Defining stores, state, getters, actions, storeToRefs, subscriptions | [core-stores](references/core-stores.md) |
+
+## Features
+
+### Extensibility
+
+| Topic | Description | Reference |
+|-------|-------------|-----------|
+| Plugins | Extend stores with custom properties, state, and behavior | [features-plugins](references/features-plugins.md) |
+
+### Composability
+
+| Topic | Description | Reference |
+|-------|-------------|-----------|
+| Composables | Using Vue composables within stores (VueUse, etc.) | [features-composables](references/features-composables.md) |
+| Composing Stores | Store-to-store communication, avoiding circular dependencies | [features-composing-stores](references/features-composing-stores.md) |
+
+## Best Practices
+
+| Topic | Description | Reference |
+|-------|-------------|-----------|
+| Testing | Unit testing with @pinia/testing, mocking, stubbing | [best-practices-testing](references/best-practices-testing.md) |
+| Outside Components | Using stores in navigation guards, plugins, middlewares | [best-practices-outside-component](references/best-practices-outside-component.md) |
+
+## Advanced
+
+| Topic | Description | Reference |
+|-------|-------------|-----------|
+| SSR | Server-side rendering, state hydration | [advanced-ssr](references/advanced-ssr.md) |
+| Nuxt | Nuxt integration, auto-imports, SSR best practices | [advanced-nuxt](references/advanced-nuxt.md) |
+| HMR | Hot module replacement for development | [advanced-hmr](references/advanced-hmr.md) |
+
+## Key Recommendations
+
+- **Prefer Setup Stores** for complex logic, composables, and watchers
+- **Use `storeToRefs()`** when destructuring state/getters to preserve reactivity
+- **Actions can be destructured directly** - they're bound to the store
+- **Call stores inside functions** not at module scope, especially for SSR
+- **Add HMR support** to each store for better development experience
+- **Use `@pinia/testing`** for component tests with mocked stores

skills/pinia/references/advanced-hmr.md

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+---
+name: hot-module-replacement
+description: Enable HMR to preserve store state during development
+---
+
+# Hot Module Replacement (HMR)
+
+Pinia supports HMR to edit stores without page reload, preserving existing state.
+
+## Setup
+
+Add this snippet after each store definition:
+
+```ts
+import { defineStore, acceptHMRUpdate } from 'pinia'
+
+export const useAuth = defineStore('auth', {
+  // store options...
+})
+
+if (import.meta.hot) {
+  import.meta.hot.accept(acceptHMRUpdate(useAuth, import.meta.hot))
+}
+```
+
+## Setup Store Example
+
+```ts
+import { defineStore, acceptHMRUpdate } from 'pinia'
+
+export const useCounterStore = defineStore('counter', () => {
+  const count = ref(0)
+  const increment = () => count.value++
+  return { count, increment }
+})
+
+if (import.meta.hot) {
+  import.meta.hot.accept(acceptHMRUpdate(useCounterStore, import.meta.hot))
+}
+```
+
+## Bundler Support
+
+- **Vite:** Officially supported via `import.meta.hot`
+- **Webpack:** Uses `import.meta.webpackHot`
+- Any bundler implementing the `import.meta.hot` spec should work
+
+## Nuxt
+
+With `@pinia/nuxt`, `acceptHMRUpdate` is auto-imported but you still need to add the HMR snippet manually.
+
+## Benefits
+
+- Edit store logic without losing state
+- Add/remove state, actions, and getters on the fly
+- Faster development iteration
+
+<!--
+Source references:
+- https://pinia.vuejs.org/cookbook/hot-module-replacement.html
+-->

skills/pinia/references/advanced-nuxt.md

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+---
+name: nuxt-integration
+description: Using Pinia with Nuxt - auto-imports, SSR, and best practices
+---
+
+# Nuxt Integration
+
+Pinia works seamlessly with Nuxt 3/4, handling SSR, serialization, and XSS protection automatically.
+
+## Installation
+
+```bash
+npx nuxi@latest module add pinia
+```
+
+This installs both `@pinia/nuxt` and `pinia`. If `pinia` isn't installed, add it manually.
+
+> **npm users:** If you get `ERESOLVE unable to resolve dependency tree`, add to `package.json`:
+> ```json
+> "overrides": { "vue": "latest" }
+> ```
+
+## Configuration
+
+```ts
+// nuxt.config.ts
+export default defineNuxtConfig({
+  modules: ['@pinia/nuxt'],
+})
+```
+
+## Auto Imports
+
+These are automatically available:
+- `usePinia()` - get pinia instance
+- `defineStore()` - define stores
+- `storeToRefs()` - extract reactive refs
+- `acceptHMRUpdate()` - HMR support
+
+**All stores in `app/stores/` (Nuxt 4) or `stores/` are auto-imported.**
+
+### Custom Store Directories
+
+```ts
+// nuxt.config.ts
+export default defineNuxtConfig({
+  modules: ['@pinia/nuxt'],
+  pinia: {
+    storesDirs: ['./stores/**', './custom-folder/stores/**'],
+  },
+})
+```
+
+## Fetching Data in Pages
+
+Use `callOnce()` for SSR-friendly data fetching:
+
+```vue
+<script setup>
+const store = useStore()
+
+// Run once, data persists across navigations
+await callOnce('user', () => store.fetchUser())
+</script>
+```
+
+### Refetch on Navigation
+
+```vue
+<script setup>
+const store = useStore()
+
+// Refetch on every navigation (like useFetch)
+await callOnce('user', () => store.fetchUser(), { mode: 'navigation' })
+</script>
+```
+
+## Using Stores Outside Components
+
+In navigation guards, middlewares, or other stores, pass the `pinia` instance:
+
+```ts
+// middleware/auth.ts
+export default defineNuxtRouteMiddleware((to) => {
+  const nuxtApp = useNuxtApp()
+  const store = useStore(nuxtApp.$pinia)
+
+  if (to.meta.requiresAuth && !store.isLoggedIn) {
+    return navigateTo('/login')
+  }
+})
+```
+
+Most of the time, you don't need this - just use stores in components or other injection-aware contexts.
+
+## Pinia Plugins with Nuxt
+
+Create a Nuxt plugin:
+
+```ts
+// plugins/myPiniaPlugin.ts
+import { PiniaPluginContext } from 'pinia'
+
+function MyPiniaPlugin({ store }: PiniaPluginContext) {
+  store.$subscribe((mutation) => {
+    console.log(`[🍍 ${mutation.storeId}]: ${mutation.type}`)
+  })
+  return { creationTime: new Date() }
+}
+
+export default defineNuxtPlugin(({ $pinia }) => {
+  $pinia.use(MyPiniaPlugin)
+})
+```
+
+<!--
+Source references:
+- https://pinia.vuejs.org/ssr/nuxt.html
+-->

skills/pinia/references/advanced-ssr.md

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+---
+name: server-side-rendering
+description: SSR setup, state hydration, and avoiding cross-request state pollution
+---
+
+# Server Side Rendering (SSR)
+
+Pinia works with SSR when stores are called at the top of `setup`, getters, or actions.
+
+> **Using Nuxt?** See the [Nuxt integration](advanced-nuxt.md) instead.
+
+## Basic Usage
+
+```vue
+<script setup>
+// ✅ Works - pinia knows the app context in setup
+const main = useMainStore()
+</script>
+```
+
+## Using Store Outside setup()
+
+Pass the `pinia` instance explicitly:
+
+```ts
+const pinia = createPinia()
+const app = createApp(App)
+app.use(router)
+app.use(pinia)
+
+router.beforeEach((to) => {
+  // ✅ Pass pinia for correct SSR context
+  const main = useMainStore(pinia)
+
+  if (to.meta.requiresAuth && !main.isLoggedIn) {
+    return '/login'
+  }
+})
+```
+
+## serverPrefetch()
+
+Access pinia via `this.$pinia`:
+
+```ts
+export default {
+  serverPrefetch() {
+    const store = useStore(this.$pinia)
+    return store.fetchData()
+  },
+}
+```
+
+## onServerPrefetch()
+
+Works normally:
+
+```vue
+<script setup>
+const store = useStore()
+
+onServerPrefetch(async () => {
+  await store.fetchData()
+})
+</script>
+```
+
+## State Hydration
+
+Serialize state on server and hydrate on client.
+
+### Server Side
+
+Use [devalue](https://github.com/Rich-Harris/devalue) for XSS-safe serialization:
+
+```ts
+import devalue from 'devalue'
+import { createPinia } from 'pinia'
+
+const pinia = createPinia()
+const app = createApp(App)
+app.use(router)
+app.use(pinia)
+
+// After rendering, state is available
+const serializedState = devalue(pinia.state.value)
+// Inject into HTML as global variable
+```
+
+### Client Side
+
+Hydrate before any `useStore()` call:
+
+```ts
+const pinia = createPinia()
+const app = createApp(App)
+app.use(pinia)
+
+// Hydrate from serialized state (e.g., from window.__pinia)
+if (typeof window !== 'undefined') {
+  pinia.state.value = JSON.parse(window.__pinia)
+}
+```
+
+## SSR Examples
+
+- [Vitesse template](https://github.com/antfu/vitesse/blob/main/src/modules/pinia.ts)
+- [vite-plugin-ssr](https://vite-plugin-ssr.com/pinia)
+
+## Key Points
+
+1. Call stores inside functions, not at module scope
+2. Pass `pinia` instance when using stores outside components in SSR
+3. Hydrate state before calling any `useStore()`
+4. Use `devalue` or similar for safe serialization
+5. Avoid cross-request state pollution by creating fresh pinia per request
+
+<!--
+Source references:
+- https://pinia.vuejs.org/ssr/
+-->

skills/pinia/references/best-practices-outside-component.md

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+---
+name: using-stores-outside-components
+description: Correctly using stores in navigation guards, plugins, and other non-component contexts
+---
+
+# Using Stores Outside Components
+
+Stores need the `pinia` instance, which is automatically injected in components. Outside components, you may need to provide it manually.
+
+## Single Page Applications
+
+Call stores **after** pinia is installed:
+
+```ts
+import { useUserStore } from '@/stores/user'
+import { createPinia } from 'pinia'
+import { createApp } from 'vue'
+import App from './App.vue'
+
+// ❌ Fails - pinia not created yet
+const userStore = useUserStore()
+
+const pinia = createPinia()
+const app = createApp(App)
+app.use(pinia)
+
+// ✅ Works - pinia is active
+const userStore = useUserStore()
+```
+
+## Navigation Guards
+
+**Wrong:** Call at module level
+
+```ts
+import { createRouter } from 'vue-router'
+const router = createRouter({ /* ... */ })
+
+// ❌ May fail depending on import order
+const store = useUserStore()
+
+router.beforeEach((to) => {
+  if (store.isLoggedIn) { /* ... */ }
+})
+```
+
+**Correct:** Call inside the guard
+
+```ts
+router.beforeEach((to) => {
+  // ✅ Called after pinia is installed
+  const store = useUserStore()
+
+  if (to.meta.requiresAuth && !store.isLoggedIn) {
+    return '/login'
+  }
+})
+```
+
+## SSR Applications
+
+Always pass the `pinia` instance to `useStore()`:
+
+```ts
+const pinia = createPinia()
+const app = createApp(App)
+app.use(router)
+app.use(pinia)
+
+router.beforeEach((to) => {
+  // ✅ Pass pinia instance
+  const main = useMainStore(pinia)
+
+  if (to.meta.requiresAuth && !main.isLoggedIn) {
+    return '/login'
+  }
+})
+```
+
+## serverPrefetch()
+
+Access pinia via `this.$pinia`:
+
+```ts
+export default {
+  serverPrefetch() {
+    const store = useStore(this.$pinia)
+    return store.fetchData()
+  },
+}
+```
+
+## onServerPrefetch()
+
+Works normally in `<script setup>`:
+
+```vue
+<script setup>
+const store = useStore()
+
+onServerPrefetch(async () => {
+  // ✅ Just works
+  await store.fetchData()
+})
+</script>
+```
+
+## Key Takeaway
+
+Defer `useStore()` calls to functions that run after pinia is installed, rather than calling at module scope.
+
+<!--
+Source references:
+- https://pinia.vuejs.org/core-concepts/outside-component-usage.html
+-->

skills/pinia/references/best-practices-testing.md

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+---
+name: testing
+description: Unit testing stores and components with @pinia/testing
+---
+
+# Testing Stores
+
+## Unit Testing Stores
+
+Create a fresh pinia instance for each test:
+
+```ts
+import { setActivePinia, createPinia } from 'pinia'
+import { useCounterStore } from '../src/stores/counter'
+
+describe('Counter Store', () => {
+  beforeEach(() => {
+    setActivePinia(createPinia())
+  })
+
+  it('increments', () => {
+    const counter = useCounterStore()
+    expect(counter.n).toBe(0)
+    counter.increment()
+    expect(counter.n).toBe(1)
+  })
+})
+```
+
+### With Plugins
+
+```ts
+import { setActivePinia, createPinia } from 'pinia'
+import { createApp } from 'vue'
+import { somePlugin } from '../src/stores/plugin'
+
+const app = createApp({})
+
+beforeEach(() => {
+  const pinia = createPinia().use(somePlugin)
+  app.use(pinia)
+  setActivePinia(pinia)
+})
+```
+
+## Testing Components
+
+Install `@pinia/testing`:
+
+```bash
+npm i -D @pinia/testing
+```
+
+Use `createTestingPinia()`:
+
+```ts
+import { mount } from '@vue/test-utils'
+import { createTestingPinia } from '@pinia/testing'
+import { useSomeStore } from '@/stores/myStore'
+
+const wrapper = mount(Counter, {
+  global: {
+    plugins: [createTestingPinia()],
+  },
+})
+
+const store = useSomeStore()
+
+// Manipulate state directly
+store.name = 'new name'
+store.$patch({ name: 'new name' })
+
+// Actions are stubbed by default
+store.someAction()
+expect(store.someAction).toHaveBeenCalledTimes(1)
+```
+
+## Initial State
+
+Set initial state for tests:
+
+```ts
+const wrapper = mount(Counter, {
+  global: {
+    plugins: [
+      createTestingPinia({
+        initialState: {
+          counter: { n: 20 }, // Store name → initial state
+        },
+      }),
+    ],
+  },
+})
+```
+
+## Action Stubbing
+
+### Execute Real Actions
+
+```ts
+createTestingPinia({ stubActions: false })
+```
+
+### Selective Stubbing
+
+```ts
+// Only stub specific actions
+createTestingPinia({
+  stubActions: ['increment', 'reset'],
+})
+
+// Or use a function
+createTestingPinia({
+  stubActions: (actionName, store) => {
+    if (actionName.startsWith('set')) return true
+    return false
+  },
+})
+```
+
+### Mock Action Return Values
+
+```ts
+import type { Mock } from 'vitest'
+
+// After getting store
+store.someAction.mockResolvedValue('mocked value')
+```
+
+## Mocking Getters
+
+Getters are writable in tests:
+
+```ts
+const pinia = createTestingPinia()
+const counter = useCounterStore(pinia)
+
+counter.double = 3 // Override computed value
+
+// Reset to default behavior
+counter.double = undefined
+counter.double // Now computed normally
+```
+
+## Custom Spy Function
+
+If not using Jest/Vitest with globals:
+
+```ts
+import { vi } from 'vitest'
+
+createTestingPinia({
+  createSpy: vi.fn,
+})
+```
+
+With Sinon:
+
+```ts
+import sinon from 'sinon'
+
+createTestingPinia({
+  createSpy: sinon.spy,
+})
+```
+
+## Pinia Plugins in Tests
+
+Pass plugins to `createTestingPinia()`:
+
+```ts
+import { somePlugin } from '../src/stores/plugin'
+
+createTestingPinia({
+  stubActions: false,
+  plugins: [somePlugin],
+})
+```
+
+**Don't use** `testingPinia.use(MyPlugin)` - pass plugins in options.
+
+## Type-Safe Mocked Store
+
+```ts
+import type { Mock } from 'vitest'
+import type { Store, StoreDefinition } from 'pinia'
+
+function mockedStore<TStoreDef extends () => unknown>(
+  useStore: TStoreDef
+): TStoreDef extends StoreDefinition<infer Id, infer State, infer Getters, infer Actions>
+  ? Store<Id, State, Record<string, never>, {
+      [K in keyof Actions]: Actions[K] extends (...args: any[]) => any
+        ? Mock<Actions[K]>
+        : Actions[K]
+    }>
+  : ReturnType<TStoreDef> {
+  return useStore() as any
+}
+
+// Usage
+const store = mockedStore(useSomeStore)
+store.someAction.mockResolvedValue('value') // Typed!
+```
+
+## E2E Tests
+
+No special handling needed - Pinia works normally.
+
+<!--
+Source references:
+- https://pinia.vuejs.org/cookbook/testing.html
+-->

skills/pinia/references/core-stores.md

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+---
+name: stores
+description: Defining stores, state, getters, and actions in Pinia
+---
+
+# Pinia Stores
+
+Stores are defined using `defineStore()` with a unique name. Each store has three core concepts: **state**, **getters**, and **actions**.
+
+## Defining Stores
+
+### Option Stores
+
+Similar to Vue's Options API:
+
+```ts
+import { defineStore } from 'pinia'
+
+export const useCounterStore = defineStore('counter', {
+  state: () => ({
+    count: 0,
+    name: 'Eduardo',
+  }),
+  getters: {
+    doubleCount: (state) => state.count * 2,
+  },
+  actions: {
+    increment() {
+      this.count++
+    },
+  },
+})
+```
+
+Think of `state` as `data`, `getters` as `computed`, and `actions` as `methods`.
+
+### Setup Stores (Recommended)
+
+Uses Composition API syntax - more flexible and powerful:
+
+```ts
+import { ref, computed } from 'vue'
+import { defineStore } from 'pinia'
+
+export const useCounterStore = defineStore('counter', () => {
+  const count = ref(0)
+  const name = ref('Eduardo')
+  const doubleCount = computed(() => count.value * 2)
+
+  function increment() {
+    count.value++
+  }
+
+  return { count, name, doubleCount, increment }
+})
+```
+
+In Setup Stores: `ref()` → state, `computed()` → getters, `function()` → actions.
+
+**Important:** You must return all state properties for Pinia to track them.
+
+### Using Stores
+
+```vue
+<script setup>
+import { useCounterStore } from '@/stores/counter'
+
+const store = useCounterStore()
+// Access: store.count, store.doubleCount, store.increment()
+</script>
+```
+
+### Destructuring with storeToRefs
+
+```vue
+<script setup>
+import { storeToRefs } from 'pinia'
+import { useCounterStore } from '@/stores/counter'
+
+const store = useCounterStore()
+
+// ❌ Breaks reactivity
+const { name, doubleCount } = store
+
+// ✅ Preserves reactivity for state/getters
+const { name, doubleCount } = storeToRefs(store)
+
+// ✅ Actions can be destructured directly
+const { increment } = store
+</script>
+```
+
+---
+
+## State
+
+State is defined as a function returning the initial state.
+
+### TypeScript
+
+Type inference works automatically. For complex types:
+
+```ts
+interface UserInfo {
+  name: string
+  age: number
+}
+
+export const useUserStore = defineStore('user', {
+  state: () => ({
+    userList: [] as UserInfo[],
+    user: null as UserInfo | null,
+  }),
+})
+```
+
+Or use an interface for the return type:
+
+```ts
+interface State {
+  userList: UserInfo[]
+  user: UserInfo | null
+}
+
+export const useUserStore = defineStore('user', {
+  state: (): State => ({
+    userList: [],
+    user: null,
+  }),
+})
+```
+
+### Accessing and Modifying
+
+```ts
+const store = useStore()
+store.count++
+```
+
+```vue
+<input v-model="store.count" type="number" />
+```
+
+### Mutating with $patch
+
+Apply multiple changes at once:
+
+```ts
+// Object syntax
+store.$patch({
+  count: store.count + 1,
+  name: 'DIO',
+})
+
+// Function syntax (for complex mutations)
+store.$patch((state) => {
+  state.items.push({ name: 'shoes', quantity: 1 })
+  state.hasChanged = true
+})
+```
+
+### Resetting State
+
+Option Stores have built-in `$reset()`. For Setup Stores, implement your own:
+
+```ts
+export const useCounterStore = defineStore('counter', () => {
+  const count = ref(0)
+
+  function $reset() {
+    count.value = 0
+  }
+
+  return { count, $reset }
+})
+```
+
+### Subscribing to State Changes
+
+```ts
+cartStore.$subscribe((mutation, state) => {
+  mutation.type // 'direct' | 'patch object' | 'patch function'
+  mutation.storeId // 'cart'
+  mutation.payload // patch object (only for 'patch object')
+
+  localStorage.setItem('cart', JSON.stringify(state))
+})
+
+// Options
+cartStore.$subscribe(callback, { flush: 'sync' }) // Immediate
+cartStore.$subscribe(callback, { detached: true }) // Keep after unmount
+```
+
+---
+
+## Getters
+
+Getters are computed values, equivalent to Vue's `computed()`.
+
+### Basic Getters
+
+```ts
+getters: {
+  doubleCount: (state) => state.count * 2,
+}
+```
+
+### Accessing Other Getters
+
+Use `this` with explicit return type:
+
+```ts
+getters: {
+  doubleCount: (state) => state.count * 2,
+  doublePlusOne(): number {
+    return this.doubleCount + 1
+  },
+},
+```
+
+### Getters with Arguments
+
+Return a function (note: loses caching):
+
+```ts
+getters: {
+  getUserById: (state) => {
+    return (userId: string) => state.users.find((user) => user.id === userId)
+  },
+},
+```
+
+Cache within parameterized getters:
+
+```ts
+getters: {
+  getActiveUserById(state) {
+    const activeUsers = state.users.filter((user) => user.active)
+    return (userId: string) => activeUsers.find((user) => user.id === userId)
+  },
+},
+```
+
+### Accessing Other Stores in Getters
+
+```ts
+import { useOtherStore } from './other-store'
+
+getters: {
+  combined(state) {
+    const otherStore = useOtherStore()
+    return state.localData + otherStore.data
+  },
+},
+```
+
+---
+
+## Actions
+
+Actions are methods for business logic. Unlike getters, they can be asynchronous.
+
+### Defining Actions
+
+```ts
+actions: {
+  increment() {
+    this.count++
+  },
+  randomizeCounter() {
+    this.count = Math.round(100 * Math.random())
+  },
+},
+```
+
+### Async Actions
+
+```ts
+actions: {
+  async registerUser(login: string, password: string) {
+    try {
+      this.userData = await api.post({ login, password })
+    } catch (error) {
+      return error
+    }
+  },
+},
+```
+
+### Accessing Other Stores in Actions
+
+```ts
+import { useAuthStore } from './auth-store'
+
+actions: {
+  async fetchUserPreferences() {
+    const auth = useAuthStore()
+    if (auth.isAuthenticated) {
+      this.preferences = await fetchPreferences()
+    }
+  },
+},
+```
+
+**SSR:** Call all `useStore()` before any `await`:
+
+```ts
+async orderCart() {
+  // ✅ Call stores before await
+  const user = useUserStore()
+
+  await apiOrderCart(user.token, this.items)
+  // ❌ Don't call useStore() after await in SSR
+}
+```
+
+### Subscribing to Actions
+
+```ts
+const unsubscribe = someStore.$onAction(
+  ({ name, store, args, after, onError }) => {
+    const startTime = Date.now()
+    console.log(`Start "${name}" with params [${args.join(', ')}]`)
+
+    after((result) => {
+      console.log(`Finished "${name}" after ${Date.now() - startTime}ms`)
+    })
+
+    onError((error) => {
+      console.warn(`Failed "${name}": ${error}`)
+    })
+  }
+)
+
+unsubscribe() // Cleanup
+```
+
+Keep subscription after component unmount:
+
+```ts
+someStore.$onAction(callback, true)
+```
+
+---
+
+## Options API Helpers
+
+```ts
+import { mapState, mapWritableState, mapActions } from 'pinia'
+import { useCounterStore } from '../stores/counter'
+
+export default {
+  computed: {
+    // Readonly state/getters
+    ...mapState(useCounterStore, ['count', 'doubleCount']),
+    // Writable state
+    ...mapWritableState(useCounterStore, ['count']),
+  },
+  methods: {
+    ...mapActions(useCounterStore, ['increment']),
+  },
+}
+```
+
+---
+
+## Accessing Global Providers in Setup Stores
+
+```ts
+import { inject } from 'vue'
+import { useRoute } from 'vue-router'
+import { defineStore } from 'pinia'
+
+export const useSearchFilters = defineStore('search-filters', () => {
+  const route = useRoute()
+  const appProvided = inject('appProvided')
+
+  // Don't return these - access them directly in components
+  return { /* ... */ }
+})
+```
+
+<!--
+Source references:
+- https://pinia.vuejs.org/core-concepts/
+- https://pinia.vuejs.org/core-concepts/state.html
+- https://pinia.vuejs.org/core-concepts/getters.html
+- https://pinia.vuejs.org/core-concepts/actions.html
+-->

skills/pinia/references/features-composables.md

@@ -0,0 +1,114 @@
+---
+name: composables-in-stores
+description: Using Vue composables within Pinia stores
+---
+
+# Composables in Stores
+
+Pinia stores can leverage Vue composables for reusable stateful logic.
+
+## Option Stores
+
+Call composables inside the `state` property, but only those returning writable refs:
+
+```ts
+import { defineStore } from 'pinia'
+import { useLocalStorage } from '@vueuse/core'
+
+export const useAuthStore = defineStore('auth', {
+  state: () => ({
+    user: useLocalStorage('pinia/auth/login', 'bob'),
+  }),
+})
+```
+
+**Works:** Composables returning `ref()`:
+- `useLocalStorage`
+- `useAsyncState`
+
+**Doesn't work in Option Stores:**
+- Composables exposing functions
+- Composables exposing readonly data
+
+## Setup Stores
+
+More flexible - can use almost any composable:
+
+```ts
+import { defineStore } from 'pinia'
+import { useMediaControls } from '@vueuse/core'
+import { ref } from 'vue'
+
+export const useVideoPlayer = defineStore('video', () => {
+  const videoElement = ref<HTMLVideoElement>()
+  const src = ref('/data/video.mp4')
+  const { playing, volume, currentTime, togglePictureInPicture } =
+    useMediaControls(videoElement, { src })
+
+  function loadVideo(element: HTMLVideoElement, newSrc: string) {
+    videoElement.value = element
+    src.value = newSrc
+  }
+
+  return {
+    src,
+    playing,
+    volume,
+    currentTime,
+    loadVideo,
+    togglePictureInPicture,
+  }
+})
+```
+
+**Note:** Don't return non-serializable DOM refs like `videoElement` - they're internal implementation details.
+
+## SSR Considerations
+
+### Option Stores with hydrate()
+
+Define a `hydrate()` function to handle client-side hydration:
+
+```ts
+import { defineStore } from 'pinia'
+import { useLocalStorage } from '@vueuse/core'
+
+export const useAuthStore = defineStore('auth', {
+  state: () => ({
+    user: useLocalStorage('pinia/auth/login', 'bob'),
+  }),
+
+  hydrate(state, initialState) {
+    // Ignore server state, read from browser
+    state.user = useLocalStorage('pinia/auth/login', 'bob')
+  },
+})
+```
+
+### Setup Stores with skipHydrate()
+
+Mark state that shouldn't hydrate from server:
+
+```ts
+import { defineStore, skipHydrate } from 'pinia'
+import { useEyeDropper, useLocalStorage } from '@vueuse/core'
+
+export const useColorStore = defineStore('colors', () => {
+  const { isSupported, open, sRGBHex } = useEyeDropper()
+  const lastColor = useLocalStorage('lastColor', sRGBHex)
+
+  return {
+    // Skip hydration for client-only state
+    lastColor: skipHydrate(lastColor),
+    open,       // Function - no hydration needed
+    isSupported, // Boolean - not reactive
+  }
+})
+```
+
+`skipHydrate()` only applies to state properties (refs), not functions or non-reactive values.
+
+<!--
+Source references:
+- https://pinia.vuejs.org/cookbook/composables.html
+-->

skills/pinia/references/features-composing-stores.md

@@ -0,0 +1,134 @@
+---
+name: composing-stores
+description: Store-to-store communication and avoiding circular dependencies
+---
+
+# Composing Stores
+
+Stores can use each other for shared state and logic.
+
+## Rule: Avoid Circular Dependencies
+
+Two stores cannot directly read each other's state during setup:
+
+```ts
+// ❌ Infinite loop
+const useX = defineStore('x', () => {
+  const y = useY()
+  y.name // Don't read here!
+  return { name: ref('X') }
+})
+
+const useY = defineStore('y', () => {
+  const x = useX()
+  x.name // Don't read here!
+  return { name: ref('Y') }
+})
+```
+
+**Solution:** Read in getters, computed, or actions:
+
+```ts
+const useX = defineStore('x', () => {
+  const y = useY()
+
+  // ✅ Read in computed/actions
+  function doSomething() {
+    const yName = y.name
+  }
+
+  return { name: ref('X'), doSomething }
+})
+```
+
+## Setup Stores: Use Store at Top
+
+```ts
+import { defineStore } from 'pinia'
+import { useUserStore } from './user'
+
+export const useCartStore = defineStore('cart', () => {
+  const user = useUserStore()
+  const list = ref([])
+
+  const summary = computed(() => {
+    return `Hi ${user.name}, you have ${list.value.length} items`
+  })
+
+  function purchase() {
+    return apiPurchase(user.id, list.value)
+  }
+
+  return { list, summary, purchase }
+})
+```
+
+## Shared Getters
+
+Call `useStore()` inside a getter:
+
+```ts
+import { useUserStore } from './user'
+
+export const useCartStore = defineStore('cart', {
+  getters: {
+    summary(state) {
+      const user = useUserStore()
+      return `Hi ${user.name}, you have ${state.list.length} items`
+    },
+  },
+})
+```
+
+## Shared Actions
+
+Call `useStore()` inside an action:
+
+```ts
+import { useUserStore } from './user'
+import { apiOrderCart } from './api'
+
+export const useCartStore = defineStore('cart', {
+  actions: {
+    async orderCart() {
+      const user = useUserStore()
+
+      try {
+        await apiOrderCart(user.token, this.items)
+        this.emptyCart()
+      } catch (err) {
+        displayError(err)
+      }
+    },
+  },
+})
+```
+
+## SSR: Call Stores Before Await
+
+In async actions, call all stores before any `await`:
+
+```ts
+actions: {
+  async orderCart() {
+    // ✅ All useStore() calls before await
+    const user = useUserStore()
+    const analytics = useAnalyticsStore()
+
+    try {
+      await apiOrderCart(user.token, this.items)
+      // ❌ Don't call useStore() after await (SSR issue)
+      // const otherStore = useOtherStore()
+    } catch (err) {
+      displayError(err)
+    }
+  },
+}
+```
+
+This ensures the correct Pinia instance is used during SSR.
+
+<!--
+Source references:
+- https://pinia.vuejs.org/cookbook/composing-stores.html
+-->

skills/pinia/references/features-plugins.md

@@ -0,0 +1,203 @@
+---
+name: plugins
+description: Extend stores with custom properties, methods, and behavior
+---
+
+# Plugins
+
+Plugins extend all stores with custom properties, methods, or behavior.
+
+## Basic Plugin
+
+```ts
+import { createPinia } from 'pinia'
+
+function SecretPiniaPlugin() {
+  return { secret: 'the cake is a lie' }
+}
+
+const pinia = createPinia()
+pinia.use(SecretPiniaPlugin)
+
+// In any store
+const store = useStore()
+store.secret // 'the cake is a lie'
+```
+
+## Plugin Context
+
+Plugins receive a context object:
+
+```ts
+import { PiniaPluginContext } from 'pinia'
+
+export function myPiniaPlugin(context: PiniaPluginContext) {
+  context.pinia   // pinia instance
+  context.app     // Vue app instance
+  context.store   // store being augmented
+  context.options // store definition options
+}
+```
+
+## Adding Properties
+
+Return an object to add properties (tracked in devtools):
+
+```ts
+pinia.use(() => ({ hello: 'world' }))
+```
+
+Or set directly on store:
+
+```ts
+pinia.use(({ store }) => {
+  store.hello = 'world'
+  // For devtools visibility in dev mode
+  if (process.env.NODE_ENV === 'development') {
+    store._customProperties.add('hello')
+  }
+})
+```
+
+## Adding State
+
+Add to both `store` and `store.$state` for SSR/devtools:
+
+```ts
+import { toRef, ref } from 'vue'
+
+pinia.use(({ store }) => {
+  if (!store.$state.hasOwnProperty('hasError')) {
+    const hasError = ref(false)
+    store.$state.hasError = hasError
+  }
+  store.hasError = toRef(store.$state, 'hasError')
+})
+```
+
+## Adding External Properties
+
+Wrap non-reactive objects with `markRaw()`:
+
+```ts
+import { markRaw } from 'vue'
+import { router } from './router'
+
+pinia.use(({ store }) => {
+  store.router = markRaw(router)
+})
+```
+
+## Custom Store Options
+
+Define custom options consumed by plugins:
+
+```ts
+// Store definition
+defineStore('search', {
+  actions: {
+    searchContacts() { /* ... */ },
+  },
+  debounce: {
+    searchContacts: 300,
+  },
+})
+
+// Plugin reads custom option
+import debounce from 'lodash/debounce'
+
+pinia.use(({ options, store }) => {
+  if (options.debounce) {
+    return Object.keys(options.debounce).reduce((acc, action) => {
+      acc[action] = debounce(store[action], options.debounce[action])
+      return acc
+    }, {})
+  }
+})
+```
+
+For Setup Stores, pass options as third argument:
+
+```ts
+defineStore(
+  'search',
+  () => { /* ... */ },
+  {
+    debounce: { searchContacts: 300 },
+  }
+)
+```
+
+## TypeScript Augmentation
+
+### Custom Properties
+
+```ts
+import 'pinia'
+import type { Router } from 'vue-router'
+
+declare module 'pinia' {
+  export interface PiniaCustomProperties {
+    router: Router
+    hello: string
+  }
+}
+```
+
+### Custom State
+
+```ts
+declare module 'pinia' {
+  export interface PiniaCustomStateProperties<S> {
+    hasError: boolean
+  }
+}
+```
+
+### Custom Options
+
+```ts
+declare module 'pinia' {
+  export interface DefineStoreOptionsBase<S, Store> {
+    debounce?: Partial<Record<keyof StoreActions<Store>, number>>
+  }
+}
+```
+
+## Subscribe in Plugins
+
+```ts
+pinia.use(({ store }) => {
+  store.$subscribe(() => {
+    // React to state changes
+  })
+  store.$onAction(() => {
+    // React to actions
+  })
+})
+```
+
+## Nuxt Plugin
+
+Create a Nuxt plugin to add Pinia plugins:
+
+```ts
+// plugins/myPiniaPlugin.ts
+import { PiniaPluginContext } from 'pinia'
+
+function MyPiniaPlugin({ store }: PiniaPluginContext) {
+  store.$subscribe((mutation) => {
+    console.log(`[🍍 ${mutation.storeId}]: ${mutation.type}`)
+  })
+  return { creationTime: new Date() }
+}
+
+export default defineNuxtPlugin(({ $pinia }) => {
+  $pinia.use(MyPiniaPlugin)
+})
+```
+
+<!--
+Source references:
+- https://pinia.vuejs.org/core-concepts/plugins.html
+-->