pi-agent stack

home/common.nix

@@ -21,6 +21,7 @@
     ./mise.nix
     ./migration.nix
     ./nvim.nix
+    ./pi.nix
     ./prompt.nix
     ./skills.nix
     ./scripts.nix

home/pi.nix

@@ -0,0 +1,47 @@
+{
+  lib,
+  pkgs,
+  hostConfig,
+  ...
+}:
+lib.mkIf hostConfig.isLinux {
+  # Install pi-coding-agent globally via npm at activation time.
+  home.activation.installPiAgent = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
+    export PATH="${
+      lib.makeBinPath [
+        pkgs.nodejs_22
+        pkgs.coreutils
+      ]
+    }:$PATH"
+
+    npm_prefix="$(npm prefix -g 2>/dev/null)"
+    pkg_dir="$npm_prefix/lib/node_modules/@mariozechner/pi-coding-agent"
+
+    if [ ! -d "$pkg_dir" ]; then
+      npm install -g @mariozechner/pi-coding-agent 2>/dev/null || true
+    fi
+  '';
+
+  # Install Pi extensions at activation time:
+  #   - @e9n/pi-channels: Telegram/Slack bridge with RPC-based persistent sessions
+  #   - pi-schedule-prompt: cron/interval scheduled prompts
+  #   - pi-subagents: background task delegation with async execution
+  home.activation.installPiExtensions = lib.hm.dag.entryAfter [ "installPiAgent" ] ''
+    export PATH="${
+      lib.makeBinPath [
+        pkgs.nodejs_22
+        pkgs.coreutils
+        pkgs.git
+      ]
+    }:$PATH"
+
+    npm_prefix="$(npm prefix -g 2>/dev/null)"
+    pi_bin="$npm_prefix/bin/pi"
+
+    if [ -x "$pi_bin" ]; then
+      for pkg in "@e9n/pi-channels" "pi-schedule-prompt" "pi-subagents"; do
+        "$pi_bin" install "npm:$pkg" 2>/dev/null || true
+      done
+    fi
+  '';
+}