Use when a developer wants to build or validate Block Kit layouts for Slack messages, modals, or Home tabs: message layouts, modals/forms/dialogs, Home tab interfaces, interactive buttons or menus, or modifying existing Block Kit JSON.
Install
npx skills add slackapi/slack-skills-plugin --skill block-kitnpx skills add slackapi/slack-skills-plugin --skill block-kit -a claude-code -gnpx skills add slackapi/slack-skills-plugin --skill block-kit -a codex -ggemini skills install https://github.com/slackapi/slack-skills-plugin.git --path skills/block-kitgh skill install slackapi/slack-skills-plugin block-kitgit clone --depth 1 https://github.com/slackapi/slack-skills-plugin /tmp/slackapi__slack-skills-plugin
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/slackapi__slack-skills-plugin/skills/block-kit ~/.claude/skills/block-kit # Claude Code
cp -R /tmp/slackapi__slack-skills-plugin/skills/block-kit ~/.agents/skills/block-kit # Codex, Cursor, Gemini CLI, Copilot, OpenCode