Enhance tool result conversion by validating toolCallId

- Added checks to ensure toolCallId exists and is a valid string before processing tool results.
- Preserves the original part if toolCallId is missing or invalid, improving robustness in message conversion.

packages/ai/src/utils/message-conversion.ts

@@ -167,6 +167,12 @@ function convertToolResultPart(part: unknown): unknown {
       }
     }
 
+    // Ensure toolCallId exists and is valid
+    // If it's missing or invalid, preserve the original part
+    if (!rest.toolCallId || typeof rest.toolCallId !== 'string') {
+      return part;
+    }
+
     return {
       ...rest,
       output,

packages/database/src/queries/messages/chatConversationHistory.ts

@@ -166,6 +166,12 @@ function convertToolResultPart(part: unknown): unknown {
       }
     }
 
+    // Ensure toolCallId exists and is valid
+    // If it's missing or invalid, preserve the original part
+    if (!rest.toolCallId || typeof rest.toolCallId !== 'string') {
+      return part;
+    }
+
     return {
       ...rest,
       output,