From 11dbfafd445a5a3de17c3c9e539fe4af04d3f50f Mon Sep 17 00:00:00 2001
From: Miroslav Drbal <miroslav.drbal@gendigital.com>
Date: Sun, 10 May 2026 15:56:33 +0200
Subject: [PATCH] fix(coding-agent): disable PTY bash in rpc-ui mode

rpc-ui sets hasUI=true which causes the bash tool to take the
runInteractiveBashPty path when pty=true. RpcExtensionUIContext.custom()
is a stub returning undefined, so result.cancelled dereferences undefined
and throws. PTY bash requires a live TUI overlay; rpc-ui only provides
dialog-style UI. Set PI_NO_PTY for rpc-ui so the usePty guard in
bash.ts stays false.
---
 packages/coding-agent/src/main.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/coding-agent/src/main.ts b/packages/coding-agent/src/main.ts
index 753ff8569..8c52f145d 100644
--- a/packages/coding-agent/src/main.ts
+++ b/packages/coding-agent/src/main.ts
@@ -659,7 +659,7 @@ export async function runRootCommand(parsed: Args, rawArgs: string[]): Promise<v
 	if (parsedArgs.mode === "rpc" || parsedArgs.mode === "rpc-ui") {
 		applyRpcDefaultSettingOverrides();
 	}
-	if (parsedArgs.noPty) {
+	if (parsedArgs.noPty || parsedArgs.mode === "rpc-ui") {
 		Bun.env.PI_NO_PTY = "1";
 	}
 	if (parsedArgs.noTitle || parsedArgs.mode === "rpc" || parsedArgs.mode === "rpc-ui") {