From 5aadc85808f3d196a4e10f3a48b8c0a571199515 Mon Sep 17 00:00:00 2001
From: mptyl <mp@tylconsulting.it>
Date: Tue, 11 Aug 2026 19:20:54 +0200
Subject: [PATCH] fix: surface sanitized operator failure detail during P2
 diagnosis

---
 backend/src/workspace-maintenance.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/backend/src/workspace-maintenance.ts b/backend/src/workspace-maintenance.ts
index e506eeaa..bb66d8b3 100644
--- a/backend/src/workspace-maintenance.ts
+++ b/backend/src/workspace-maintenance.ts
@@ -41,8 +41,10 @@ function boundedJson(result: WorkspaceOperationResult): string {
   return encoded;
 }
 
-function sanitizeStderr(_error: unknown): string {
-  return "workspace maintenance failed\n";
+function sanitizeStderr(error: unknown): string {
+  const detail = error instanceof Error ? error.message : String(error);
+  const safe = detail.replace(/[\r\n]+/g, " ").slice(0, 512);
+  return safe.length > 0 ? `workspace maintenance failed: ${safe}\n` : "workspace maintenance failed\n";
 }
 
 function parseRequest(command: string, stdin: string): Record<string, unknown> {