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Trip-level tags: admins configure available tags in the trip header (inline add/remove pills). The AI can also create new tags via the add_tag tool. Event tags: selectable in the Add Event modal, shown as colored pills on event cards in the timeline, and on AI suggestion cards. AI integration: sees available tags in its system prompt, applies them when proposing events, can create new ones with add_tag. Discord: tags shown as inline code blocks under each event in /trip view. Colors: auto-assigned from an 8-color palette by tag index, consistent everywhere.