From 3953e9ef497024d13c6f4aa646d0adda2e37b0f8 Mon Sep 17 00:00:00 2001
From: yzchen <yzchen_space@163.com>
Date: Thu, 13 Aug 2026 12:17:37 +0800
Subject: [PATCH] fix(examples): todo renderResult returns undefined on
 validation errors

When a todo call fails schema validation, createErrorToolResult produces
details: {} (a truthy empty object), so renderResult skips both the
!details and details.error branches, then switch (details.action) has no
default and returns undefined. ToolExecutionComponent.updateDisplay()
then calls addChild(undefined), and the next Box.render pass crashes the
whole interactive TUI.

Add a default case that renders the validation error text.
---
 packages/coding-agent/examples/extensions/todo.ts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/packages/coding-agent/examples/extensions/todo.ts b/packages/coding-agent/examples/extensions/todo.ts
index 67cba7424..71b7aae87 100644
--- a/packages/coding-agent/examples/extensions/todo.ts
+++ b/packages/coding-agent/examples/extensions/todo.ts
@@ -276,6 +276,13 @@ export default function (pi: ExtensionAPI) {
 
 				case "clear":
 					return new Text(theme.fg("success", "✓ ") + theme.fg("muted", "Cleared all todos"), 0, 0);
+
+				default:
+					return new Text(
+						result.content[0]?.type === "text" ? theme.fg("error", result.content[0].text) : "",
+						0,
+						0,
+					);
 			}
 		},
 	});