hermes-mcp

Overview

Hermes MCP is a comprehensive implementation of the Model Context Protocol in Elixir, offering both client and server functionality. The SDK leverages Elixir's actor model and BEAM VM to handle concurrent MCP connections efficiently. It supports multiple transport mechanisms including streamable HTTP and SSE, with detailed examples for Plug and Phoenix integration. The library follows the official MCP specification closely and includes built-in tool registration, request handling, and response management.

Try asking AI

After installing, here are 5 things you can ask your AI assistant:

• echo

  echoes everything the user says to the LLM

  Try:Echo this text back to meTry:Can you repeat what I just said?

Note: The README shows how to define tools using the library but only provides one complete example with the 'echo' tool. Other tools would need to be defined by users of this SDK.

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Installation

def deps do
  [
    {:hermes_mcp, "~> 0.14.1"}
  ]
end

{
  "mcpServers": {
    "hermes-elixir": {
      "command": "elixir",
      "args": ["--no-halt", "path/to/your/server.exs"]
    }
  }
}

FAQ

What transport protocols does Hermes MCP support?

Hermes MCP supports streamable HTTP and Server-Sent Events (SSE) for transport, with examples provided for both Plug and Phoenix applications.

How do I implement a custom tool in Hermes MCP?

To implement a custom tool, define a module that uses `Hermes.Server`, register the tool with `register_tool/3`, and implement the `handle_tool/3` callback to handle tool requests.

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