Elixir MCP Server

@epinault

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基本情報

カテゴリ

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ライセンス

MIT license

トランスポート

stdio

作者

epinault

Elixir MCP Server について

An example of how to implement an MCP server using Elixir and SSE transport

#elixir #mcp #server #sse #protocol

Elixir MCP Server の設定

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リポジトリ

Elixir MCP Server のツール

List files in a directory

Echo a message back

Get weather information

概要

What is Elixir MCP Server?

An Elixir implementation of the Model Context Protocol (MCP) server using Elixir with Bandit and Plug. It uses SSE (Server-Sent Events) as the transport protocol and provides example tools for AI models to interact with local and remote resources.

How to use Elixir MCP Server?

Install dependencies with mix deps.get, then start the server with the WEATHER_API_KEY environment variable set: WEATHER_API_KEY="your_key" mix run --no-halt. The server is available at http://localhost:4000/sse for SSE and http://localhost:4000/message for messages.

Key features of Elixir MCP Server

Implements the Model Context Protocol (MCP) using SSE transport
Built with Elixir, Bandit, and Plug
Provides three built-in tools: list_files, echo, get_weather
Supports custom tools by modifying handle_initialize and handle_call_tool
Can be tested with the NXP Inspector client

Use cases of Elixir MCP Server

Integrate AI models with local file systems via the list_files tool
Create echo or debugging endpoints for AI interactions
Fetch weather data using the get_weather tool and a free WeatherAPI key
Build custom MCP servers by extending the provided example

よくある質問

What are the runtime requirements?

Elixir 1.18 or higher and Erlang/OTP 27 or higher are required.

How is the server transport configured?

The server uses Server-Sent Events (SSE) as the transport protocol. The SSE endpoint is at `/sse` and the message endpoint is at `/message`.

Where does the weather API key come from?

The `WEATHER_API_KEY` environment variable should hold your API key from the free tier of https://www.weatherapi.com/.

How can I test the server?

Use the NXP Inspector client with SSE transport to list tools, call them, and send ping/keepalive requests.

Can I add my own tools?

Yes. Update the `handle_initialize/2` function to define new tools and implement corresponding `handle_call_tool/3` clauses.

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