Apply and build the Universal App functions capability. Use for trusted server-side logic, secrets, external APIs, custom model endpoints, published Fabric data agents, webhooks, or privileged operations.
Install
npx skills add microsoft/rayfin --skill functions-capabilitynpx skills add microsoft/rayfin --skill functions-capability -a claude-code -gnpx skills add microsoft/rayfin --skill functions-capability -a codex -ggemini skills install https://github.com/microsoft/rayfin.git --path samples/universal-app/template/.agents/skills/functions-capabilitygh skill install microsoft/rayfin functions-capabilitygit clone --depth 1 https://github.com/microsoft/rayfin /tmp/microsoft__rayfin
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/microsoft__rayfin/samples/universal-app/template/.agents/skills/functions-capability ~/.claude/skills/functions-capability # Claude Code
cp -R /tmp/microsoft__rayfin/samples/universal-app/template/.agents/skills/functions-capability ~/.agents/skills/functions-capability # Codex, Cursor, Gemini CLI, Copilot, OpenCode