diff --git a/packages/coding-agent/test/agent-dashboard-create-editor.test.ts b/packages/coding-agent/test/agent-dashboard-create-editor.test.ts
index 8569492c8..d23745a9a 100644
--- a/packages/coding-agent/test/agent-dashboard-create-editor.test.ts
+++ b/packages/coding-agent/test/agent-dashboard-create-editor.test.ts
@@ -36,8 +36,8 @@ function stubStdoutGeometry(cols: number): { setRows(n: number): void; restore()
 	const rowsDesc = Object.getOwnPropertyDescriptor(process.stdout, "rows");
 	const colsDesc = Object.getOwnPropertyDescriptor(process.stdout, "columns");
 	let rows = 24;
-	Object.defineProperty(process.stdout, "rows", { configurable: true, get: () => rows });
-	Object.defineProperty(process.stdout, "columns", { configurable: true, get: () => cols });
+	Object.defineProperty(process.stdout, "rows", { configurable: true, get: () => rows, set: () => {} });
+	Object.defineProperty(process.stdout, "columns", { configurable: true, get: () => cols, set: () => {} });
 	const restoreOne = (key: "rows" | "columns", desc: PropertyDescriptor | undefined) => {
 		if (desc) Object.defineProperty(process.stdout, key, desc);
 		else Object.defineProperty(process.stdout, key, { configurable: true, value: undefined, writable: true });
diff --git a/packages/coding-agent/test/agent-hub-advisor-scroll.test.ts b/packages/coding-agent/test/agent-hub-advisor-scroll.test.ts
index cf39f0d84..ea00815e8 100644
--- a/packages/coding-agent/test/agent-hub-advisor-scroll.test.ts
+++ b/packages/coding-agent/test/agent-hub-advisor-scroll.test.ts
@@ -123,7 +123,7 @@ describe("AgentTranscriptViewer", () => {
 		await Settings.init({ inMemory: true });
 		initTheme();
 		rowsDesc = Object.getOwnPropertyDescriptor(process.stdout, "rows");
-		Object.defineProperty(process.stdout, "rows", { configurable: true, get: () => 24 });
+		Object.defineProperty(process.stdout, "rows", { configurable: true, get: () => 24, set: () => {} });
 	});
 
 	afterEach(() => {
diff --git a/packages/coding-agent/test/agent-hub-ordering.test.ts b/packages/coding-agent/test/agent-hub-ordering.test.ts
index 8f1d1c7ee..e6cbcc2da 100644
--- a/packages/coding-agent/test/agent-hub-ordering.test.ts
+++ b/packages/coding-agent/test/agent-hub-ordering.test.ts
@@ -23,8 +23,8 @@ function stubStdoutGeometry(cols: number): GeometryStub {
 	const rowsDesc = Object.getOwnPropertyDescriptor(process.stdout, "rows");
 	const colsDesc = Object.getOwnPropertyDescriptor(process.stdout, "columns");
 	let rows = 24;
-	Object.defineProperty(process.stdout, "rows", { configurable: true, get: () => rows });
-	Object.defineProperty(process.stdout, "columns", { configurable: true, get: () => cols });
+	Object.defineProperty(process.stdout, "rows", { configurable: true, get: () => rows, set: () => {} });
+	Object.defineProperty(process.stdout, "columns", { configurable: true, get: () => cols, set: () => {} });
 	const restoreOne = (key: "rows" | "columns", desc: PropertyDescriptor | undefined) => {
 		if (desc) Object.defineProperty(process.stdout, key, desc);
 		else Object.defineProperty(process.stdout, key, { configurable: true, value: undefined, writable: true });
diff --git a/packages/coding-agent/test/modes/components/settings-selector-memory-refresh.test.ts b/packages/coding-agent/test/modes/components/settings-selector-memory-refresh.test.ts
index 369a072c9..3e1bd8aa6 100644
--- a/packages/coding-agent/test/modes/components/settings-selector-memory-refresh.test.ts
+++ b/packages/coding-agent/test/modes/components/settings-selector-memory-refresh.test.ts
@@ -25,8 +25,8 @@ function stubStdoutGeometry(cols: number): { restore(): void } {
 	const rowsDesc = Object.getOwnPropertyDescriptor(process.stdout, "rows");
 	const colsDesc = Object.getOwnPropertyDescriptor(process.stdout, "columns");
 	const rows = 40;
-	Object.defineProperty(process.stdout, "rows", { configurable: true, get: () => rows });
-	Object.defineProperty(process.stdout, "columns", { configurable: true, get: () => cols });
+	Object.defineProperty(process.stdout, "rows", { configurable: true, get: () => rows, set: () => {} });
+	Object.defineProperty(process.stdout, "columns", { configurable: true, get: () => cols, set: () => {} });
 	const restoreOne = (key: "rows" | "columns", desc: PropertyDescriptor | undefined) => {
 		if (desc) Object.defineProperty(process.stdout, key, desc);
 		else Object.defineProperty(process.stdout, key, { configurable: true, value: undefined, writable: true });