fix(telegram-bot): skip empty structured messages (#1857)

services/telegram-bot/src/bots/telegram/agent/actions/send-message.test.ts

@@ -45,6 +45,16 @@ describe('parseMayStructuredMessage', () => {
     expect(result).toMatchObject({ messages: [text], reply_to_message_id: undefined })
   })
 
+  it('should return null when structured output has an empty messages array', () => {
+    const result = parseMayStructuredMessage('{"messages":[]}')
+    expect(result).toBeNull()
+  })
+
+  it('should return null when structured output has only blank messages', () => {
+    const result = parseMayStructuredMessage('{"messages":["", "   "]}')
+    expect(result).toBeNull()
+  })
+
   it('should return an array of messages from multi-line elements of input', () => {
     const result = parseMayStructuredMessage(`{"messages": [
 "Hello,

services/telegram-bot/src/bots/telegram/agent/actions/send-message.ts

@@ -26,7 +26,8 @@ export function parseMayStructuredMessage(responseText: string) {
     logger.withField('text', JSON.stringify(responseText)).withField('result', result).log('Multiple messages detected')
 
     const parsedResponse = parse(result[0]) as ({ messages?: unknown, reply_to_message_id?: unknown } | undefined)
-    const messages = Array.isArray(parsedResponse?.messages)
+    const hasMessagesArray = Array.isArray(parsedResponse?.messages)
+    const messages = hasMessagesArray
       ? parsedResponse.messages.filter((message): message is string => typeof message === 'string' && message.trim() !== '')
       : []
     const replyToMessageId = typeof parsedResponse?.reply_to_message_id === 'string'
@@ -37,6 +38,10 @@ export function parseMayStructuredMessage(responseText: string) {
       return { messages, reply_to_message_id: replyToMessageId }
     }
 
+    if (hasMessagesArray) {
+      return null
+    }
+
     return { messages: [responseText], reply_to_message_id: replyToMessageId }
   }