diff --git a/.pi/extensions/run_make_test.ts b/.pi/extensions/run_make_test.ts
new file mode 100644
index 0000000..7983ba6
--- /dev/null
+++ b/.pi/extensions/run_make_test.ts
@@ -0,0 +1,37 @@
+import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
+
+export default function (pi: ExtensionAPI) {
+  pi.on("session_start", async (_event, ctx) => {
+    try {
+      const { stdout, stderr, code } = await pi.exec("make", ["test"]);
+      const output = stdout + stderr;
+
+      if (code === 0) {
+        ctx.ui.notify("make test passed", "info");
+      } else {
+        ctx.ui.notify(`make test failed (exit ${code})`, "error");
+      }
+
+      // Also send the output as a message so it's visible in the session
+      pi.sendMessage({
+        customType: "run-make-test",
+        content: [
+          {
+            type: "text",
+            text: `Here's the result of running \`make test\`:\n\n\`\`\`\n${output}\`\`\``,
+          },
+        ],
+        display: true,
+      }, { deliverAs: "followUp" });
+    } catch (error) {
+      const message = error instanceof Error ? error.message : String(error);
+      pi.sendMessage({
+        customType: "run-make-test",
+        content: [
+          { type: "text", text: `Error running make test: ${message}` },
+        ],
+        display: true,
+      }, { deliverAs: "followUp" });
+    }
+  });
+}