add_reaction
Input
emoji requiredA single unicode emoji, e.g. a thumbs up. Limited to a set of common emoji this script can name for Discord's picker search (thumbs up/down, heart, laughing, fire, 100, eyes, check mark, clap, party popper, thinking, and a few more); an emoji outside that set is refused with a clear reason rather than guessed at. Custom server emoji are not supported.
messageUrl requiredFull message url, e.g. https://discord.com/channels/<guildId>/<channelId>/<messageId>. discord.com/read_messages returns the ids to build one. Must not be a forum/thread post's own opening message (where the channelId and messageId segments are equal) — that message's context menu has no add-reaction entry, so it is refused; react to a reply inside the post instead.
remove optionalLeave false (the default) to add your reaction. Set true to take your own reaction off; other people's reactions are never touched.
Default: falseOutput
emoji requiredreacted requiredWhether your reaction is on the message after this run.
channelId requiredmessageId requiredalready_present requiredTrue when the message was already in the requested state, so nothing was written.
count optionalHow many people have reacted with this emoji afterwards, as Discord shows it; null once no pill remains.
request_seen optionalWhether Discord's own reaction request was observed for this change.
FAQ
Read Discord messages
Reads the most recent messages of a Discord channel (author, timestamp, text), newest first, scrolling up to load more until the requested count. Requires being logged in. It also reads a thread or a forum post, since both are channels in their own right: pass the post's url (from discord.com/list_forum_posts) and you get its replies plus the opening post, newest first — there is no separate thread-reading script. To list the posts of a forum channel rather than its messages, use discord.com/list_forum_posts instead.
Post a Discord message
Posts a text message in a Discord channel, addressed by channel URL. Requires being logged in to Discord. Returns `sent` plus the created message's messageId, channelId, timestamp and content as Discord stored it. This is a write: the message appears in the channel and is visible to everyone who can see it. Discord's own message limits are checked before anything is sent, so a message that is empty or whitespace-only, or longer than 2000 characters, is refused straight away with a clear reason.
Discord login
Opens the Discord web app in the browser and reports whether the account is signed in, together with the username and display name it is signed in as. Run this first: the other Discord scripts need the web app open on a signed-in session.