CapsKit 💊

The Universal Capability Kernel — Break free from controllers. Package your business logic into pure, swappable capsules that run identically via HTTP, Event Bus, CLI, or internal routines.

🚀 Why CapsKit?

Traditional architectures tightly couple business logic to the transport layer (Controllers/Request objects). This makes it hard to reuse logic in CRON jobs, background workers, or CLIs.

CapsKit implements the Capability Architecture pattern:

• Zero Boundary Logic: Capsules don't know about HTTP or Frameworks.
• Declarative Manifests: Routing, Traits, and Events are defined in simple metadata.
• Universal Pipelines: Global Interceptors and Action-level Hooks for tracing, auth, and more.
• Plugin Architecture: Any capsule is a plugin — just populate caps and register.

📦 Installation

npm install @mobtakronio/capskit elysia
# or
bun add @mobtakronio/capskit elysia

🛠️ Quick Start

1. Define a Capsule

// src/capsules/orders/capsule.ts
import { CapsuleDefinition } from '@mobtakronio/capskit';

export default {
  name: 'orders',
  dependencies: ['database'],
  boot: {
    init: async ({ deps }) => {
      // deps.database is available from platform dependencies
    },
  },
} satisfies CapsuleDefinition;

// src/capsules/orders/caps/list-orders.cap.ts
import { CapInput, CapContext, CapMeta } from '@mobtakronio/capskit';

export const meta: CapMeta = {
  name: 'list-orders',
  kind: 'action',
  routes: [{ method: 'GET', path: '/orders', action: 'list-orders' }],
};

export default async function listOrders(_input: CapInput, ctx: CapContext) {
  const repo = ctx.deps.dependencies.orderRepo;
  const orders = await repo.findWithFilters({ status: 'pending' });
  return { orders };
}

2. Boot the Kernel

import { createCapsKitPlatform } from '@mobtakronio/capskit';
import { createElysiaAdapter } from '@mobtakronio/capskit-elysia';
import { Elysia } from 'elysia';

// Create the platform
const platform = await createCapsKitPlatform();

// Register factory capsules (e.g., database)
platform.registerCapsule(createDrizzleCapsule({
  dialect: 'sqlite',
  connection: './db.sqlite',
}));

// Boot with user capsule directories
await platform.boot({ body: { capsuleDirs: ['./src/capsules'] } });

// Create the Elysia adapter
const { app } = await createElysiaAdapter(platform, { http: true });

// Start the server
app.listen(3000);

3. Invoke Capsules

// Via proxy (recommended)
const orders = platform.use('orders');
const { orders: list } = await orders['list-orders']({});

// Via call
const result = await platform.call('orders.list-orders', {});

🧱 Capsule Patterns

Filesystem Capsules

Place capsule.ts at the root with .cap.ts files in caps/. The kernel auto-discovers all caps.

Factory Capsules

For programmatic capsules (databases, cache, etc.), include caps inline:

const myCaps: CapsuleCap[] = [
  {
    meta: { name: 'query', kind: 'action' },
    handler: async (input, ctx) => ctx.deps.dependencies.myRepo.query(input.body),
  },
];

export function createMyCapsule(config: MyConfig): CapsuleDefinition {
  return {
    name: 'my-capsule',
    caps: myCaps,
    boot: {
      init: async ({ deps }) => {
        deps.dependencies.myRepo = createMyRepository(await connect(config));
      },
    },
  };
}

📖 Documentation

Visit capskit.io (Coming Soon!) or check the /docs folder for the full guide.

📄 License

MIT © 2026 CapsKit Team / MobtakronIO