chatmux MCP server

chatmux

Local-first personal chat data layer daemon. Connects IM platforms (v0.1: LINE) via child-process adapters, stores messages to JSONL + SQLite/FTS5, exposes MCP tools for AI clients.

The three repos

chatmux is the core. Platforms plug in below it, consumers sit above it, and both sides of that boundary live in their own repos:

Adapters speak the adapter protocol; consumers speak MCP. Either side can be replaced without touching the other.

Quickstart

1. Install

git clone https://github.com/echoedinvoker/chatmux.git
cd chatmux
bun install

2. Decide whether to connect an account yet

With no adapters.json, bun run start launches the LINE adapter, which means step 3 puts your LINE account on the line — read Account Risk Warning before you run it. If you would rather look around first, start with no adapter at all:

mkdir -p ~/.local/share/chatmux
cat > ~/.local/share/chatmux/adapters.json <<'JSON'
{
  "adapters": [],
  "mcp": { "port": 7717 }
}
JSON
bun run start

The daemon comes up with storage and the full MCP interface — you can initialize, list tools, and read resources. There is simply no chat data behind them until an adapter is connected. Set CHATMUXDATADIR to keep this trial run out of your real data directory:

CHATMUX_DATA_DIR=/tmp/chatmux-trial bun run start

Each entry in adapters takes platform, a command string, and an args array (plus optional cwd and env):

{ "platform": "telegram", "command": "python", "args": ["-m", "chatmux_adapter_telegram"] }

For Telegram, follow the setup in chatmux-adapter-telegram — it has its own credentials and login flow, and does not involve LINE.

3. First login (QR code)

bun run start
# A QR code will appear in the terminal
# Open LINE on your phone → open the QR scanner → scan
#   iOS:     Home → the scan icon
#   Android: Home → Add friends → QR code
# After successful login, authToken is saved for future auto-login

4. Connect Claude Code

Register the daemon's MCP endpoint with Claude Code:

claude mcp add --transport http chatmux http://127.0.0.1:7717/mcp
claude mcp list   # chatmux: ... - ✔ Connected

The daemon listens on two transports at once: a TCP port on 127.0.0.1 (default 7717) for standard MCP clients like Claude Code, and a unix socket for same-host sidecar consumers like chat.nvim. Use the TCP url for Claude Code — the MCP spec only defines stdio and streamable HTTP transports, so no MCP client accepts a unix socket path.

Port is configurable via CHATMUXMCPPORT, or mcp.port in adapters.json; set it to 0 to disable the TCP listener. See docs/mcp-interface.md.

Architecture

LINE adapter ←── stdio JSON-RPC ──→ core daemon ←── MCP Streamable HTTP ──→ Claude Code
(Node+tsx)        (child process)    (Bun)         (127.0.0.1 TCP / unix)     (MCP client)
                                     ├─ SafetyRail
                                     ├─ Storage (JSONL → SQLite/FTS5)
                                     ├─ Adapter Runner
                                     └─ MCP Server

Shortened. The full README is on GitHub.