Mux FAQs

Question 1

Is Mux difficult to set up or manage?

Accepted Answer

Mux is designed for simple setup. You define your backend servers in a `.mcp-mux.json` file and point Claude Code to the Mux shim. The broker auto-starts on first use and auto-exits after inactivity, requiring no manual daemon management.

Question 2

What happens if a backend server crashes while using Mux?

Accepted Answer

Mux includes robust crash recovery. Backend servers that crash are automatically restarted with exponential backoff. If a server exceeds its maximum restart attempts, it's marked as failed, and in-flight requests receive an error response instead of hanging.

Question 3

What is Mux (mcp-mux)?

Accepted Answer

Mux is a stdio-to-stdio MCP multiplexer designed for Claude Code. It allows multiple Claude Code sessions to share backend stdio MCP server processes via a central broker, significantly reducing the number of spawned processes and overall resource overhead.

Question 4

How does Mux reduce server process overhead?

Accepted Answer

Claude Code typically spawns a new MCP server process per session. Mux replaces this with lightweight 'shims' (one per session) that connect to a single background 'broker'. The broker then manages a shared pool of backend MCP servers, reducing many individual processes to just a few.

Question 5

Does Mux support both shared and per-session server configurations?

Accepted Answer

Yes, Mux offers flexible server modes. 'Shared' mode (default) uses one backend process for all sessions, ideal for stateless tools. 'Per-session' mode spawns a dedicated backend process for each Claude Code session, suitable for stateful servers like Playwright.

Mux

Mux

Key Features

Use Cases

Key Features

Use Cases