discord.com
reply_to_message
Input
message requiredThe reply text. Discord's own limit is 2000 characters.
messageUrl requiredFull url of the message to reply to, e.g. https://discord.com/channels/<guildId>/<channelId>/<messageId>. discord.com/read_messages or discord.com/search_messages return the ids to build one.
Output
sent requiredchannelId requiredrepliedTo requiredThe id of the message this replied to, as Discord's own response records it.
content optionalmessageId optionaltimestamp optional