@frontmcp/sdk

The core FrontMCP framework for building MCP servers and clients in TypeScript.

Install

npm install @frontmcp/sdk

Most users should scaffold with npx frontmcp create my-app instead of installing manually. See Installation.

Features

• @FrontMcp server — single decorator configures info, apps, HTTP, logging, session, auth (docs)
• @App — group tools, resources, prompts into isolated domains (docs)
• @Tool — typed actions with Zod input schemas, class or function style (docs)
• @Resource — read-only data with static and template URIs (docs)
• @Prompt — reusable message templates returning GetPromptResult (docs)
• @Agent — orchestrated multi-step tool chains (docs)
• Elicitation — request structured user input mid-flow (docs)
• Skills — HTTP-discoverable tool manifests for agent marketplaces (docs)
• 5 context classes — ToolContext, ResourceContext, PromptContext, AgentContext, HookContext
• Direct client — create(), connect(), connectOpenAI(), connectClaude(), connectLangChain(), connectVercelAI() (docs)
• Authentication — Remote OAuth, Local OAuth, JWKS, DCR, per-app auth surfaces (docs)
• Sessions — stateful / stateless modes, JWT or UUID transport IDs
• Hooks — tool, list-tools, HTTP, resource, prompt hook families (docs)
• Ext-Apps — mount external MCP servers as sub-apps (docs)
• Providers / DI — scoped injection with GLOBAL and CONTEXT scopes (docs)
• ConfigPlugin — load frontmcp.yaml / frontmcp.json config files (docs)
• Transport — Streamable HTTP + SSE (docs)

Quick Example

import 'reflect-metadata';
import { FrontMcp, App, Tool } from '@frontmcp/sdk';
import { z } from 'zod';

@Tool({ name: 'greet', inputSchema: { name: z.string() } })
class GreetTool {
  async execute({ name }: { name: string }) {
    return `Hello, ${name}!`;
  }
}

@App({ id: 'hello', name: 'Hello', tools: [GreetTool] })
class HelloApp {}

@FrontMcp({ info: { name: 'Demo', version: '0.1.0' }, apps: [HelloApp], http: { port: 3000 } })
export default class Server {}

Full walkthrough: Quickstart

Docs

| Topic | Link | | ------------------------- | -------------------------------------------------------------------------------------------------- | | Server configuration | The FrontMCP Server | | Apps & isolation | Apps | | Tools, Resources, Prompts | Tools · Resources · Prompts | | Agents | Agents | | Authentication | Auth Overview · Remote OAuth · Local OAuth | | Direct client | Direct Client | | Hooks & providers | Hooks · Providers | | Deployment | Local Dev · Production | | SDK reference | Overview |

Related Packages

• @frontmcp/cli — scaffolding and dev tooling
• @frontmcp/auth — authentication library
• @frontmcp/adapters — OpenAPI adapter
• @frontmcp/plugins — Cache, Remember, CodeCall, Dashboard
• @frontmcp/testing — E2E testing framework
• @frontmcp/ui / @frontmcp/uipack — UI components and build tools

License

Apache-2.0 — see LICENSE.