Create or edit a PostHog freeform canvas — a sandboxed browser application (data board, document, form, small tool, graphics experiment) stored in PostHog and rendered by the desktop/web app. Use when a task asks to build, generate, update, or fix a standalone canvas app, or when a freeform canvas id is given as the publish target.
Install
npx skills add PostHog/ai-plugin --skill building-canvasesnpx skills add PostHog/ai-plugin --skill building-canvases -a claude-code -gnpx skills add PostHog/ai-plugin --skill building-canvases -a codex -ggemini skills install https://github.com/PostHog/ai-plugin.git --path skills/building-canvasesgh skill install PostHog/ai-plugin building-canvasesgit clone --depth 1 https://github.com/PostHog/ai-plugin /tmp/PostHog__ai-plugin
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/PostHog__ai-plugin/skills/building-canvases ~/.claude/skills/building-canvases # Claude Code
cp -R /tmp/PostHog__ai-plugin/skills/building-canvases ~/.agents/skills/building-canvases # Codex, Cursor, Gemini CLI, Copilot, OpenCode