diff --git a/packages/markform/src/harness/programmaticFill.ts b/packages/markform/src/harness/programmaticFill.ts
index 73d61382..36dc5fa1 100644
--- a/packages/markform/src/harness/programmaticFill.ts
+++ b/packages/markform/src/harness/programmaticFill.ts
@@ -1276,6 +1276,19 @@ async function runMultiTurnForItems(
       };
     }
 
+    // Call onPatchesGenerated callback (after agent, before applying)
+    if (mergedCallbacks?.onPatchesGenerated) {
+      try {
+        mergedCallbacks.onPatchesGenerated({
+          turnNumber: startTurn + turnsUsed + 1,
+          patches: response.patches,
+          stats: response.stats,
+        });
+      } catch (cbError) {
+        warnCallbackError('onPatchesGenerated', cbError);
+      }
+    }
+
     // Apply patches
     let lastCoercionWarnings: PatchWarning[] | undefined;
     if (response.patches.length > 0) {