meow 2

config/modules/ai/model-cost.ts

@@ -0,0 +1,61 @@
+/**
+ * Model cost display extension - shows cost info in status bar.
+ *
+ * Format: "$X.XX (Y.YY) in" where Y.YY is cache write cost if present.
+ *
+ * Usage: pi -e ./model-cost.ts
+ */
+
+import type {
+	ExtensionAPI,
+	ModelSelectEvent,
+	UIContext,
+} from "@earendil-works/pi-coding-agent";
+
+export default function (pi: ExtensionAPI) {
+	const modelSelectHandler = async (
+		event: ModelSelectEvent,
+		ctx: UIContext,
+	) => {
+		const { model } = event;
+
+		// Get cost data from model config
+		const cost = getModelCost(model);
+
+		if (cost) {
+			ctx.ui.setStatus("model", cost);
+		} else {
+			ctx.ui.setStatus("model", "");
+		}
+	};
+
+	pi.on("model_select", modelSelectHandler);
+}
+
+function getModelCost(model: any): string {
+	if (!model?.cost) return "";
+
+	const { input, output, cacheRead, cacheWrite } = model.cost;
+
+	// Only show if there's actual cost data
+	const hasCost =
+		input !== 0 || output !== 0 || cacheRead !== 0 || cacheWrite !== 0;
+	if (!hasCost) return "";
+
+	// Format: "$X.XX (Y.YY) in"
+	const parts: string[] = [];
+
+	if (input !== 0) {
+		const cachePrefix = cacheRead > 0 ? ` (↙${cacheRead}) ` : "";
+		parts.push(`$${input}${cachePrefix}in`);
+	}
+
+	if (output !== 0) {
+		const cachePrefix = cacheWrite > 0 ? ` (↗${cacheWrite}) ` : "";
+		parts.push(`$${output}${cachePrefix}out`);
+	}
+
+	if (parts.length === 0) return "";
+
+	return parts.join(" / ");
+}

config/modules/ai/pi.nix

@@ -188,7 +188,12 @@
         home.file.".pi/agent/extensions/model-filter.ts" = {
           source = ./model-filter.ts;
         };
-
+    
+        # Show model cost in status bar
+        home.file.".pi/agent/extensions/model-cost.ts" = {
+          source = ./model-cost.ts;
+        };
+    
         # Model filter config: per-provider filters applied by model-filter.ts
         home.file.".pi/agent/model-filters.json" = {
           text = builtins.toJSON {