Slack Block Kit UI framework for building rich, interactive layouts in Slack messages, modals, and App Home. CRITICAL: Two Markup Systems Text inside Block Kit text objects uses Slack mrkdwn syntax ( , ), NOT standard Markdown. The only exception is the block which uses standard Markdown. Quick Decision Trees "Should I use blocks?" "Which block type?" "mrkdwn or markdown block?" Block Types Overview header Large bold text for section titles. only. Max 150 chars. section Primary content block. Supports text, two-column fields, and one accessory element. Two-column fields layout: Either or requ…