diff --git a/src/agent/core/SystemPrompts.ts b/src/agent/core/SystemPrompts.ts
index 9f4e80d..ad292da 100644
--- a/src/agent/core/SystemPrompts.ts
+++ b/src/agent/core/SystemPrompts.ts
@@ -262,6 +262,6 @@ export class SystemPrompts {
    * Clear the cached template (useful for development/testing)
    */
   static clearCache(): void {
-    this.cachedTemplate = null;
+    this.cachedTemplates.clear();
   }
 }
diff --git a/src/util/opfsModelCache.ts b/src/util/opfsModelCache.ts
index 6d37198..1b6202e 100644
--- a/src/util/opfsModelCache.ts
+++ b/src/util/opfsModelCache.ts
@@ -123,13 +123,14 @@ export class OpfsModelCache {
       const finalWritable = await finalHandle.createWritable();
       try {
         const tempFile = await tempHandle.getFile();
+        const tempBuffer = await tempFile.arrayBuffer();
         console.log('[opfsModelCache] Temp file ready for finalize copy.', {
           filename,
           tempFilename,
           tempSize: tempFile.size,
           expectedSize: sizeValue,
         });
-        await finalWritable.write(tempFile);
+        await finalWritable.write(tempBuffer);
         await finalWritable.close();
       } catch (error) {
         await finalWritable.abort();