From 72a43dc0636e30fd93958aa3b006a4d202f24b58 Mon Sep 17 00:00:00 2001
From: Mario Zechner <badlogicgames@gmail.com>
Date: Sat, 4 Apr 2026 12:41:09 +0200
Subject: [PATCH] fix(coding-agent): forward RpcClient subprocess stderr to
 parent in real-time

fixes #2805
---
 packages/coding-agent/CHANGELOG.md                | 4 ++++
 packages/coding-agent/src/modes/rpc/rpc-client.ts | 1 +
 2 files changed, 5 insertions(+)

diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 182a03d6..9273fc51 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- RpcClient now forwards subprocess stderr to parent process in real-time ([#2805](https://github.com/badlogic/pi-mono/issues/2805))
+
 ## [0.65.0] - 2026-04-03
 
 ### New Features
diff --git a/packages/coding-agent/src/modes/rpc/rpc-client.ts b/packages/coding-agent/src/modes/rpc/rpc-client.ts
index e012ca05..fce737bf 100644
--- a/packages/coding-agent/src/modes/rpc/rpc-client.ts
+++ b/packages/coding-agent/src/modes/rpc/rpc-client.ts
@@ -92,6 +92,7 @@ export class RpcClient {
 		// Collect stderr for debugging
 		this.process.stderr?.on("data", (data) => {
 			this.stderr += data.toString();
+			process.stderr.write(data);
 		});
 
 		// Set up strict JSONL reader for stdout.