diff --git a/app/api/0pt/documents/structure/route.ts b/app/api/0pt/documents/structure/route.ts
index 51689f3..53ffe79 100644
--- a/app/api/0pt/documents/structure/route.ts
+++ b/app/api/0pt/documents/structure/route.ts
@@ -244,6 +244,7 @@ export async function POST(request: NextRequest) {
     );
   }
 
+  console.log('[0pt-workbench] doc0 source read:', sources.sources.length, 'segments');
   const sourceChars = sources.sources.reduce((total, source) => total + source.text.length, 0);
   const estimatedInputTokens = Math.ceil(JSON.stringify(sources.sources).length / 4) + 1024;
   if (estimatedInputTokens > policy.maxInputTokens) {
@@ -433,6 +434,7 @@ export async function POST(request: NextRequest) {
       }
     }
     const message = error instanceof Error ? error.message : 'Structuring failed';
+    console.error('[0pt-workbench] structure failed:', message);
     return NextResponse.json(
       { error: 'STRUCTURE_FAILED', message, reservation_id: reservationId },
       { status: 502 },