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Cortex

Build MCP Servers Declaratively in Golang

## Table of Contents - [Overview](#overview) - [Installation](#installation) - [Quickstart](#quickstart) - [What is MCP?](#what-is-mcp) - [Core Concepts](#core-concepts) - [Server](#server) - [Tools](#tools) - [Providers](#providers) - [Resources](#resources) - [Prompts](#prompts) - [Running Your Server](#running-your-server) - [STDIO](#stdio) - [HTTP with SSE](#http-with-sse) - [Multi-Protocol](#multi-protocol) - [Testing and Debugging](#testing-and-debugging) - [Examples](#examples) - [Basic Examples](#basic-examples) - [Advanced Examples](#advanced-examples) - [Plugin System](#plugin-system) - [Package Structure](#package-structure) - [Contributing](#contributing) - [License](#license) - [Support & Contact](#support--contact) ## Overview The Model Context Protocol allows applications to provide context for LLMs in a standardized way, separating the concerns of providing context from the actual LLM interaction. Cortex implements the full MCP specification, making it easy to: - Build MCP servers that expose resources and tools - Use standard transports like stdio and Server-Sent Events (SSE) - Handle all MCP protocol messages and lifecycle events - Follow Go best practices and clean architecture principles > **Note:** Cortex is always updated to align with the latest MCP specification from [spec.modelcontextprotocol.io/latest](https://spec.modelcontextprotocol.io/latest) ## Installation ```bash go get github.com/FreePeak/cortex ``` ## Quickstart Let's create a simple MCP server that exposes an echo tool: ```go package main import ( "context" "fmt" "log" "os" "github.com/FreePeak/cortex/pkg/server" "github.com/FreePeak/cortex/pkg/tools" ) func main() { // Create a logger that writes to stderr instead of stdout // This is critical for STDIO servers as stdout must only contain JSON-RPC messages logger := log.New(os.Stderr, "[cortex] ", log.LstdFlags) // Create the server mcpServer := server.NewMCPServer("Echo Server Example", "1.0.0", logger) // Create an echo tool echoTool := tools.NewTool("echo", tools.WithDescription("Echoes back the input message"), tools.WithString("message",

Cortex

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