Elixir MCP Server: Real-Time Scalability & Effortless Concurrency

Elixir MCP Server delivers real-time, scalable MCP implementations via Elixir and SSE, powering modern apps with reliable performance and effortless concurrency.

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About Elixir MCP Server

What is Elixir MCP Server: Real-Time Scalability & Effortless Concurrency?

Elixir MCP Server is an open-source implementation of the Model Context Protocol (MCP), leveraging Elixir's concurrency model and Bandit web server to enable secure, real-time interactions between AI models and distributed resources. Built with SSE (Server-Sent Events) as the transport layer, this server provides standardized access to local and remote services while maintaining robust operational reliability.

How to use Elixir MCP Server: Real-Time Scalability & Effortless Concurrency?

Initialization requires installing dependencies via `mix deps.get`, then starting the server with an environment-configured weather API key. The service exposes two primary endpoints: an SSE stream for real-time data delivery and a message endpoint for structured command handling. External tools like the NXP Inspector client can connect via SSE to execute predefined operations such as file listing, weather queries, and diagnostic pings.

Elixir MCP Server Features

Key Features of Elixir MCP Server: Real-Time Scalability & Effortless Concurrency?

Native Concurrency: Built on Elixir's lightweight processes and OTP supervision trees for fault-tolerant, horizontally scalable execution
Modular Tooling: Extendable via function-based tool definitions with clear separation between initialization and operation handling
Secure API Integration: Environment-variable driven configuration for third-party services like weather APIs
Protocol Compliance: Fully adheres to MCP specifications for interoperability with certified clients

Use cases of Elixir MCP Server: Real-Time Scalability & Effortless Concurrency?

Elixir MCP Server FAQ

FAQ from Elixir MCP Server: Real-Time Scalability & Effortless Concurrency?

Why Elixir? - Leverages BEAM's concurrency model for low-latency, high-throughput event processing
Tool Extension: Add capabilities by modifying handle_initialize/2 and implementing handle_call_tool/3 clauses
SSE Necessity: Provides bidirectional communication without WebSocket overhead while maintaining protocol compatibility
Scalability: Handles thousands of concurrent connections with minimal resource consumption
Testing: Use the NXP Inspector to validate tool registration and execution

Content

Elixir MCP Server

An Elixir implementation of the Model Context Protocol (MCP) server using Elixir with Bandit and Plug.

The Model Context Protocol (MCP) is an open protocol that enables AI models to securely interact with local and remote resources through standardized server implementations. This project is a basic example of an MCP server using SSE (Server-Sent Events) as the transport protocol. It is based off the example at https://modelcontextprotocol.io/quickstart/server

Prerequisites

Elixir 1.18 or higher
Erlang/OTP 27 or higher
The weather API key can be set through the WEATHER_API_KEY environment variable. The default service is using the free tier of https://www.weatherapi.com/.

Getting Started

Install dependencies:

mix deps.get
Start the server:

WEATHER_API_KEY="1234567890abcdef" mix run --no-halt
The server will be available at:

* SSE endpoint: http://localhost:4000/sse
* Message endpoint: http://localhost:4000/message

Available Tools

list_files: List files in a directory
echo: Echo a message back
get_weather: Get weather information

Testing with MCP Client

Install the NXP Inspector client and follow the instructions to connect to the server.

Make sure to use SSE (Server-Sent Events) as the transport protocol, then you should be able to list available tools and call them. Also to ping/keepalive the connection, you can use the ping tool.

Adding Custom Tools

To add custom tools, update the handle_initialize/2 function to include your tool definitions and implement corresponding handle_call_tool/3 clauses.