suggest_reply returns a suggested reply for a conversation. It does not send the reply. The message goes out only if you ask for a separate send.
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What the assistant calls
1
Read the thread
list_conversations and list_conversation_messages load the conversation. The assistant needs the conversation id before it can suggest a reply.2
Suggest
suggest_reply returns the text. The assistant shows it to you and waits.3
Send only if you ask
A later
send_message with type: text is a different request. It still has to fall inside the 24-hour window.