diff --git a/default/pi/agent/extensions/omarchy-system-theme.ts b/default/pi/agent/extensions/omarchy-system-theme.ts
new file mode 100644
index 00000000..18c6fef6
--- /dev/null
+++ b/default/pi/agent/extensions/omarchy-system-theme.ts
@@ -0,0 +1,41 @@
+/**
+ * Syncs pi's light/dark theme with the active Omarchy theme.
+ *
+ * Omarchy light themes include:
+ *   ~/.config/omarchy/current/theme/light.mode
+ */
+
+import { existsSync } from "node:fs";
+import { join } from "node:path";
+import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
+
+const home = process.env.HOME ?? "";
+const lightModePath = join(home, ".config/omarchy/current/theme/light.mode");
+
+function omarchyPiTheme(): "light" | "dark" {
+	return existsSync(lightModePath) ? "light" : "dark";
+}
+
+export default function (pi: ExtensionAPI) {
+	let intervalId: ReturnType<typeof setInterval> | null = null;
+
+	pi.on("session_start", (_event, ctx) => {
+		let currentTheme = omarchyPiTheme();
+		ctx.ui.setTheme(currentTheme);
+
+		intervalId = setInterval(() => {
+			const nextTheme = omarchyPiTheme();
+			if (nextTheme !== currentTheme) {
+				currentTheme = nextTheme;
+				ctx.ui.setTheme(currentTheme);
+			}
+		}, 2000);
+	});
+
+	pi.on("session_shutdown", () => {
+		if (intervalId) {
+			clearInterval(intervalId);
+			intervalId = null;
+		}
+	});
+}
diff --git a/install/config/all.sh b/install/config/all.sh
index 39d5c6d1..72effc32 100644
--- a/install/config/all.sh
+++ b/install/config/all.sh
@@ -24,6 +24,7 @@ run_logged $OMARCHY_INSTALL/config/unmount-fuse.sh
 run_logged $OMARCHY_INSTALL/config/sudoless-asdcontrol.sh
 run_logged $OMARCHY_INSTALL/config/input-group.sh
 run_logged $OMARCHY_INSTALL/config/omarchy-ai-skill.sh
+run_logged $OMARCHY_INSTALL/config/pi.sh
 run_logged $OMARCHY_INSTALL/config/omarchy-toggles.sh
 run_logged $OMARCHY_INSTALL/config/kernel-modules-hook.sh
 run_logged $OMARCHY_INSTALL/config/powerprofilesctl-rules.sh
diff --git a/install/config/pi.sh b/install/config/pi.sh
new file mode 100644
index 00000000..4afefecb
--- /dev/null
+++ b/install/config/pi.sh
@@ -0,0 +1,2 @@
+mkdir -p ~/.pi/agent/extensions
+cp "$OMARCHY_PATH/default/pi/agent/extensions/omarchy-system-theme.ts" ~/.pi/agent/extensions/
diff --git a/migrations/1778151386.sh b/migrations/1778151386.sh
new file mode 100644
index 00000000..5f9fb388
--- /dev/null
+++ b/migrations/1778151386.sh
@@ -0,0 +1,4 @@
+echo "Add Omarchy pi system theme extension"
+
+mkdir -p "$HOME/.pi/agent/extensions"
+cp "$OMARCHY_PATH/default/pi/agent/extensions/omarchy-system-theme.ts" "$HOME/.pi/agent/extensions/"