Slack automation CLI for AI agents. Use when:
- Reading a Slack message or thread (given a URL or channel+ts)
- Browsing recent channel messages / channel history
- Getting all unread messages across channels
- Searching Slack messages or files
- Sending, editing, or deleting a message; adding/removing reactions
- Uploading files/images to channels or threads (including stdin piping)
- Downloading Slack files and attachments to local paths
- Listing, inspecting, or deleting files
- Listing channels/conversations; creating channels and inviting users
- Fetching a Slack canvas as markdown
- Looking up Slack users
- Marking channels/DMs as read
- Opening DM or group DM channels
Triggers: "slack message", "slack thread", "slack URL", "read slack", "reply on slack", "search slack", "channel history", "recent messages", "mark as read", "unread messages", "unread", "what did I miss", "upload file", "send image", "download file", "slack file", "attach file"
2026-06-03