Moshi Best Practices

Use this skill to make any host feel easy to use from Moshi.

Use it for either:

fresh setup
verification of an existing setup

Rules

Inspect before editing.
Prefer direct config edits over platform-specific setup scripts.
Verify every outcome after changing it.
For moshi DIR, use a shell function named moshi, not a literal alias. Aliases cannot take arguments safely.

1. Host Readiness

Target outcome:

preferred transport is Mosh plus tmux; fallback is SSH plus tmux
the host has a working SSH entry point
tmux is installed
mosh-server is installed when the user wants Mosh, otherwise SSH plus tmux is acceptable
both resolve in the current shell and in the login shell's non-interactive mode
at least one tmux session exists so the Moshi selector can appear.

Inspect with a small set of real checks. Keep OS-specific mechanics minimal, but do not skip verification.

Useful checks:

command -v tmux || true
command -v mosh-server || true
tmux list-sessions 2>/dev/null || true
LOGIN_SHELL="${SHELL:-/bin/sh}"
"$LOGIN_SHELL" -c 'command -v tmux'
"$LOGIN_SHELL" -c 'command -v mosh-server'

Useful macOS-specific checks when relevant:

dscl . -read "/Users/$USER" UserShell
systemsetup -getremotelogin || true

Verify after changes:

command -v tmux
tmux list-sessions
"$LOGIN_SHELL" -c 'command -v tmux'
"$LOGIN_SHELL" -c 'command -v mosh-server' || true

Then ask the user to reconnect from Moshi. Expected result: the tmux selector appears, and the transport can use Mosh instead of plain SSH when configured.

2. tmux Environment

Use these defaults unless the user wants something different:

set -g history-limit 100000
set -g mouse on
set -g set-titles on
set -g set-titles-string "#I: #W"
set -g base-index 1
setw -g pane-base-index 1
set -g renumber-windows on

Workflow:

inspect the existing tmux config
update overlapping settings instead of appending duplicates
reload tmux after editing

3. MOSHI_CLIENT Signal

MOSHI_CLIENT=1 is an opt-in environment variable the Moshi iOS client exports into the remote shell so rc files, prompts, and tmux configs can detect a Moshi-launched session and adapt. The user enables it in the app under Settings → Integrations → Export ENV (off by default). When on, it is set identically on both the Mosh path (via mosh-server -l MOSHI_CLIENT=1) and the SSH fallback (via an injected export at shell start).

The main use case is protecting Moshi's swipe-to-change-window gesture, which relies on reading the tmux status bar. A populated status-left / status-right from a custom theme can break detection. Conditionally clearing them when MOSHI_CLIENT is set keeps local themes intact while keeping Moshi detection reliable. Other uses: narrower prompts, dropping nerd-font glyphs, different key bindings.

Shell (in the user's rc file):

if [ -n "$MOSHI_CLIENT" ]; then
  # running under Moshi — trim prompts, skip heavy glyphs, etc.
fi

tmux (in ~/.tmux.conf):

# propagate the variable into tmux sessions attached by this shell
set-option -ga update-environment " MOSHI_CLIENT"

# clear status regions for Moshi clients so swipe detection stays clean
if-shell '[ -n "$MOSHI_CLIENT" ]' {
  set -g status-left ''
  set -g status-right ''
}

After editing, reload tmux (tmux source-file ~/.tmux.conf).

Verify, after the user toggles the setting on and reconnects from Moshi:

echo "$MOSHI_CLIENT"                       # expect: 1
tmux show-environment | grep MOSHI_CLIENT  # expect a value in new sessions

If echo prints nothing, the toggle is off in the app — confirm with the user before editing host configs. The variable only appears in sessions opened after the toggle was flipped.

4. tmux Project Session

When creating a new session:

read the current working directory
ask one concise question: should the session start from here?
if the answer is no, ask for the directory
default the session name to the directory basename
create the session detached
use the chosen directory for every initial window with tmux ... -c <dir>

Recommended windows:

agent
review
tests
servers
misc

Create the session detached and root every initial window at the chosen directory.

Then ask the user to reconnect in Moshi. Expected result: the session is visible in the tmux selector.

5. Optional `moshi DIR` Helper

Do not install this silently. Ask the user first if they want it.

If yes:

install a shell function named moshi in the correct startup file for the active shell
make it accept a directory argument, defaulting to $PWD
name the tmux session from the directory basename
create the standard detached session layout only if the session does not already exist
attach to the session afterward

Use the exact function from references/moshi-shell-function.md.

6. Agent Hooks

Moshi has switched to a new hook system: moshi-hook (singular), a portable Go daemon. Unlike the old fire-and-forget moshi-hooks CLI, the daemon holds a persistent WebSocket to Moshi, so approvals are bidirectional — users can approve or deny tool calls directly from the iOS Live Activity or the Apple Watch, and the answer round-trips back to the agent without leaving the terminal. It also covers Claude Code, Codex CLI, and OpenCode from a single install.

Use moshi-hook, not hand-written config, unless the user explicitly wants manual edits.

Install via the Homebrew tap, then pair and install hooks:

brew tap rjyo/moshi
brew install moshi-hook
moshi-hook pair --token <YOUR_TOKEN>   # token comes from the Moshi mobile app
moshi-hook install                     # writes hook configs for installed agents
brew services start moshi-hook         # keeps the daemon alive across reboots

On macOS, moshi-hook pair uses Keychain by default. If pairing over SSH fails because Keychain is locked or unavailable, prefer one of these explicit paths:

security unlock-keychain ~/Library/Keychains/login.keychain-db
moshi-hook pair --token <YOUR_TOKEN>

For headless hosts where Keychain access is undesirable or unreliable:

moshi-hook pair --token <YOUR_TOKEN> --store file

--store file writes the host secrets to ~/.config/moshi/secrets.json with 0600 permissions and remembers the store choice for future serve, status, usage --sync, and pair commands. Do not use it silently; call out that this stores secrets outside Keychain.

moshi-hook install is non-destructive — it writes Moshi entries into ~/.claude/settings.json, ~/.codex/config.toml, and .opencode/plugins/moshi-hooks.ts, leaving any user-owned hooks alone.

Verify:

moshi-hook status         # pairing state, socket path, WS connection
moshi-hook logs -f        # tail the daemon log

Then run a short real agent task and confirm Moshi receives a push notification or Live Activity update, and that approving from the Live Activity / Watch unblocks the agent.

For full CLI reference (every subcommand, flag, env var, and path), see app-hook/docs/usage.md in the monorepo, or the mirrored copy in the rjyo/homebrew-moshi tap.

Legacy: `moshi-hooks` (Bun CLI)

The previous Bun-based CLI still works for older agent versions and for environments where Homebrew is unavailable. It is fire-and-forget — no bidirectional approvals, no Live Activity / Watch round-trip — but it remains a valid fallback. Do not mix the two on the same host: if moshi-hook is installed and paired, prefer it.

bunx moshi-hooks setup
bunx moshi-hooks token <YOUR_TOKEN>

Optional integrations:

bunx moshi-hooks setup --local
bunx moshi-hooks setup .
bunx moshi-hooks setup --codex
bunx moshi-hooks setup --opencode