Mcpc

Build agentic MCP servers by composing existing MCP tools.

MCPC is the SDK for building agentic MCP (Model Context Protocol) Servers. You can use it to:

1. Create Powerful Agentic MCP Tools: Simply describe your vision in text and reference tools from the expanding MCP community. As standard MCP tools, your agents work everywhere and collaborate seamlessly.
2. Fine-Tune Existing Tools: Flexibly modify existing tool descriptions and parameters, or wrap and filter results to precisely adapt them to your specific business scenarios.
3. Build Multi-Agent Systems: By defining each agent as a MCP tool, you can compose and orchestrate them to construct sophisticated, collaborative multi-agent systems.

Key Features

• Portability and agent interoperability: Build once, run everywhere as MCP tools - agents work across all MCP clients and can discover and collaborate with each other through standard MCP interfaces
• Simple composition and fine-tuning: Compose MCP servers as building blocks, select and customize tools, or modify their descriptions and parameters
• Logging and tracing: Built-in MCP logging and OpenTelemetry tracing support
• Skills support: Define domain-specific knowledge following the Agent Skills specification - deploy to production, share via MCP, and declare tool dependencies
• Flexible execution modes: Multiple specialized modes to fit different scenarios - interactive agent (agentic), AI SDK sampling (ai_sampling), AI ACP mode (ai_acp), secure code execution (code_execution), and sandbox + sampling (code_execution_sampling) - each with dedicated implementations

Quick Start

Three Ways to Get Started

1. Use the Website (Fastest)

Visit mcpc.tech to browse servers from the official MCP registry, discover tools, and generate ready-to-use agents.

2. Use the Agent (Interactive)

Let AI help you discover servers and build agents:

Add to your MCP client:

{
  "mcpServers": {
    "mcpc-builder-agent": {
      "command": "npx",
      "args": ["-y", "@mcpc-tech/builder", "mcpc-builder-agent"]
    }
  }
}

3. Write Code (Full Control)

Use the SDK directly for complete customization. See examples below.

Installation

# npm (from npm registry)
npm install @mcpc-tech/core
# npm (from jsr)
npx jsr add @mcpc/core

# deno
deno add jsr:@mcpc/core

# pnpm (from npm registry)
pnpm add @mcpc-tech/core
# pnpm (from jsr)
pnpm add jsr:@mcpc/core

Or run directly with the CLI (no installation required):

# Run with remote configuration
npx -y @mcpc-tech/cli --config-url \
  "https://raw.githubusercontent.com/mcpc-tech/mcpc/main/packages/cli/examples/configs/codex-fork.json"

Examples: Create a Simple Codex/Claude Code Fork

import { mcpc } from "@mcpc/core";

const server = await mcpc(
  [{ name: "coding-agent", version: "0.1.0" }, { capabilities: { tools: {} } }],
  [{
    name: "coding-agent",
    description: `
      You are a coding assistant with advanced capabilities.

      Your capabilities include:
      - Reading and writing files
      - Executing terminal commands to build, test, and run projects
      - Interacting with GitHub to create pull requests and manage issues