Niri IPC

Use Niri IPC through the niri msg CLI (preferred) or by writing JSON requests to $NIRI_SOCKET.

This skill assumes:

• You are on Linux with Niri running.


• $NIRI_SOCKET is set (usually true inside the Niri session).

Quick start (recommended)

Use the bundled helper script (wrapper around niri msg --json):

./skills/niri-ipc/scripts/niri.py version
./skills/niri-ipc/scripts/niri.py outputs
./skills/niri-ipc/scripts/niri.py workspaces
./skills/niri-ipc/scripts/niri.py windows
./skills/niri-ipc/scripts/niri.py focused-window

Deeper control

1) High-level helpers (window matching)

Use scripts/niri_ctl.py when you want to refer to windows by title/app_id substring instead of ids:

# List windows (optionally filtered)
./skills/niri-ipc/scripts/niri_ctl.py list-windows --query firefox

# Focus a window by substring match
./skills/niri-ipc/scripts/niri_ctl.py focus firefox

# Close a matched window (focus then close)
./skills/niri-ipc/scripts/niri_ctl.py close firefox

# Move a matched window to a workspace (by index or by name)
./skills/niri-ipc/scripts/niri_ctl.py move-to-workspace firefox 3
./skills/niri-ipc/scripts/niri_ctl.py move-to-workspace firefox web

# Focus a workspace by index or name
./skills/niri-ipc/scripts/niri_ctl.py focus-workspace 2
./skills/niri-ipc/scripts/niri_ctl.py focus-workspace web

2) Full IPC access (raw socket)

Use scripts/niri_socket.py to talk to $NIRI_SOCKET directly (newline-delimited JSON):

# Send a simple request (JSON string)
./skills/niri-ipc/scripts/niri_socket.py raw '"FocusedWindow"'

# Batch requests: one JSON request per line on stdin
printf '%s\n' '"FocusedWindow"' '"Workspaces"' | ./skills/niri-ipc/scripts/niri_socket.py stdin

# Event stream (prints JSON events until interrupted)
./skills/niri-ipc/scripts/niri_socket.py event-stream

Actions

Pass through Niri actions:

# Focus workspace by index
./skills/niri-ipc/scripts/niri.py action focus-workspace 2

# Move focused window to workspace
./skills/niri-ipc/scripts/niri.py action move-window-to-workspace 3

# Focus a window by id
./skills/niri-ipc/scripts/niri.py action focus-window 123

# Close focused window
./skills/niri-ipc/scripts/niri.py action close-window

# Reload niri config
./skills/niri-ipc/scripts/niri.py action load-config-file

# Spawn (no shell)
./skills/niri-ipc/scripts/niri.py action spawn -- alacritty

# Spawn through shell
./skills/niri-ipc/scripts/niri.py action spawn-sh -- 'notify-send hello'

Output configuration

Use niri msg output ... via the wrapper:

./skills/niri-ipc/scripts/niri.py output --help

Working directly with niri msg

If you don’t want the helper script, call Niri directly:

niri msg --json windows
niri msg --json action focus-workspace 2

Tip: if niri msg parsing errors happen after upgrades, restart the compositor (new niri msg against old compositor is a common mismatch).

Event stream

For status bars/daemons: Niri can stream events.

# Raw JSON event lines (runs until interrupted)
./skills/niri-ipc/scripts/niri.py event-stream

# Just a few lines for a quick test
./skills/niri-ipc/scripts/niri.py event-stream --lines 5

Troubleshooting

• If commands fail with “NIRI_SOCKET is not set”: run inside your Niri session, or export the socket path.
• If you need the socket protocol details, read: ./skills/niri-ipc/references/ipc.md.
• If your goal is complex automation (pick the right window by title/app_id, etc.), first query windows, then act by window id.