How do I add a new child MCP server?

Edit `priv/config/mcp_servers.json` with the server's command, arguments, environment variables, and tool definitions. The server starts automatically as a supervised process.

What MCP endpoints are available?

- `GET /mcp/stream` – SSE stream (returns `x-mcp-client-id` header). - `POST /mcp/rpc` – JSON-RPC 2.0 (requires `x-mcp-client-id` header).

What credentials does it need?

It reads `API_KEY`, `BFL_API_KEY`, `DART_TOKEN`, `CLOUDFLARE_WORKER_URL`, `CLOUDFLARE_ACCOUNT_ID`, `CLOUDFLARE_API_TOKEN` from the environment. Store these in your client's env block or a secrets manager — never commit them to a repository — and grant the narrowest scope that still covers your use case.

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MCPheonix MCP Server

A simplified implementation of the Model Context Protocol (MCP) server using Elixir's Phoenix Framework.

Local serverstdioPython

What is the MCPheonix MCP Server?

A simplified implementation of the Model Context Protocol (MCP) server using Elixir's Phoenix Framework.

What you get

MCP server built on Phoenix Framework (Elixir). Exposes Server-Sent Events and JSON-RPC endpoints for MCP clients, with support for managing multiple child MCP servers through JSON configuration.

Configuration and credentials

| Dependency | Version | |-----------|---------| | Elixir | >= 1.14 | | Erlang/OTP | >= 25 | | Phoenix | ~> 1.7.0 | | Node.js | >= 18 (for child MCP servers) | | Python | >= 3.9 (for Flux/Dart integration) |

More MCP options

Compare MCP servers by category, or browse hosted MCP servers if you prefer an endpoint over a local process.

Maintainer setup documentation.

Recorded tools

Check the linked publisher documentation and your connected client's tool list. Names and availability can vary with the server version and account permissions.

Tool	What it does
phoenix	~> 1.7.0
phoenix_live_view	~> 0.19.0
ash	~> 2.9

Configuration

Variable	Description	Required
API_KEY	Credential the server authenticates with.	Yes
BFL_API_KEY	Credential the server authenticates with.	Yes
DART_TOKEN	Credential the server authenticates with.	Yes
CLOUDFLARE_WORKER_URL	Endpoint or connection string the server talks to.	Yes
CLOUDFLARE_ACCOUNT_ID	Configuration value read at startup.	Optional
CLOUDFLARE_API_TOKEN	Credential the server authenticates with.	Yes

Example prompts to try

“Use MCPheonix to Area.”
“Use MCPheonix to Transport.”
“Use MCPheonix to Framework.”

Frequently asked questions

Elixir >= 1.14, Erlang/OTP >= 25, Phoenix ~> 1.7, Node.js >= 18, and Python >= 3.9 (optional for Flux/Dart).

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