--- title: Your application layout: framework_docs objective: Demonstrates running an MCP server inside your application status: beta order: 3 --- [Tidewave](https://tidewave.ai/) is an example of a MCP server that runs inside your application. It currently is available for Phoenix and Rails. Phoenix installation: ```elixir # mix.exs {:tidewave, "~> 0.1", only: :dev} # lib/my_app_web/endpoint.ex # just above the `if code_reloading? do` block if Code.ensure_loaded?(Tidewave) do plug Tidewave end ``` Rails installation: ```ruby gem "tidewave", group: :development ``` Example `.cursor/mcp.json`: ```json { "mcpServers": { "tidewave": { "url": "http://localhost:4000/tidewave/mcp" } } } ``` For Claude and others, they recommend an [mcp-proxy](https://github.com/sparfenyuk/mcp-proxy?tab=readme-ov-file#1-stdio-to-sse).

# mix.exs
{:tidewave, "~> 0.1", only: :dev}

# lib/my_app_web/endpoint.ex
# just above the `if code_reloading? do` block
if Code.ensure_loaded?(Tidewave) do
  plug Tidewave
end

gem "tidewave", group: :development

{
  "mcpServers": {
    "tidewave": {
      "url": "http://localhost:4000/tidewave/mcp"
    }
  }
}