Smithery SDK

TypeScript types for building MCP servers on the Smithery hosted runtime.

Docs: https://smithery.ai/docs/build

Installation

npm install @smithery/sdk

Usage

The SDK provides types for the Smithery runtime context that your MCP server receives when deployed.

import type {
  ServerModule,
  ServerContext,
  Session,
} from "@smithery/sdk"
import { z } from "zod"

// Define your configuration schema
export const configSchema = z.object({
  apiKey: z.string(),
})

// Create your server
export default const createServer = async (context: ServerContext<z.infer<typeof configSchema>>) => {
  const { config, env } = context

  // Access user configuration
  console.log(config.apiKey)

  // Access environment variables
  console.log(env.MY_SECRET)

  // For stateful servers, access session storage
  if ("session" in context) {
    await context.session.set("key", "value")
    const value = await context.session.get("key")
  }

  // Return your MCP server instance
  return new Server({ name: "my-server", version: "1.0.0" }, { capabilities: {} })
}

Types

ServerContext<TConfig>

The context object passed to your server factory function:

• config: TConfig - User-provided configuration (validated against your configSchema)
• env: Record<string, string | undefined> - Environment variables
• session?: Session - Session storage (only for stateful servers)

Session

Key-value storage scoped to the user session:

• get<T>(key: string): Promise<T | undefined>
• set(key: string, value: unknown): Promise<void>
• delete(key: string): Promise<void>

ServerModule<TConfig>

The expected exports from your server entry point:

• default: CreateServerFn<TConfig> - Factory function that creates your MCP server
• configSchema?: z.ZodSchema<TConfig> - Zod schema for configuration validation
• createSandboxServer?: CreateSandboxServerFn - Optional function for deployment scanning
• stateful?: boolean - Whether the server maintains state between requests (default: false)

Documentation

For complete documentation, see:

• Quickstart Guide

License

MIT