Comments
Comments keep discussion on the initiative, bug, todo, or pull request it is about, where people will look for it later.
Comment and reply
Open an item and add a comment. Reply to a comment to start a thread, and react with an emoji to acknowledge an update without adding another message. @mentions and threads waiting on your reply also appear in your Work Inbox, where you can answer without opening the item.
Work tables show a comment count on items that have comments. Select it to open the thread.
Each comment shows where it was written, such as the dashboard, an MCP client, or the API. Editing a comment does not change its source.
Mention people and link work
Type @ in a comment or description to mention a person or link an initiative. A linked initiative appears as a chip that opens it.
Pasted One Horizon URLs also render as chips with the item's title and status. To copy a link, select Copy link or Copy ID in the detail view header, or use Copy... in the item's menu (⋯) to copy the URL, ID, or the title and description as Markdown. Paste an ID into search to jump straight to the item.
When a discussion needs the whole channel, start a Slack thread from the item.
Deleting comments
Deleting a comment that has replies removes its text but keeps the thread, so the replies still make sense.