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_SOCKETis set (usually true inside the Niri session).
Quick start (recommended)
Use the bundled helper script (wrapper around niri msg --json):
bash./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:
bash# 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):
bash# 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:
bash# 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:
bash./skills/niri-ipc/scripts/niri.py output --help
Working directly with niri msg
If you don’t want the helper script, call Niri directly:
bashniri 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.
bash# 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.

