UI5 development best practices and coding standards derived exclusively from official SAP UI5 guidelines. Use when writing UI5 applications to ensure modern, maintainable code following SAP standards. Covers: async module loading (sap.ui.define, ES6 imports, core:require), ComponentSupport initialization, data binding with OData types, i18n management, CSP compliance (no inline scripts), TypeScript event types (UI5 >= 1.115.0), MCP tooling (get_api_reference, run_ui5_linter), CAP integration patterns, and form creation rules (never SimpleForm, always Form with ColumnLayout).

SAP Fiori design guidelines for building enterprise applications. Use this skill when designing, building, or reviewing SAP Fiori applications, implementing SAPUI5 or UI5 Web Components, working with SAP enterprise UX patterns, or needing guidance on buttons, forms, tables, object pages, list reports, navigation, messaging, colors, typography, accessibility, AI/Joule integration, or any SAP Fiori UI element. Triggers on mentions of Fiori, SAPUI5, UI5, SAP UX, SAP design system, or enterprise application design following SAP standards.

Use when migrating UI5 apps from legacy FLP sandbox to the new sandbox (New Sandbox). Triggers on /modernize-flp-sandbox, mentions of "flpSandbox.html", "sap-ushell-config", or requests to update sandbox configuration.

Modernize QUnit unit tests and OPA5 integration tests to the UI5 Test Starter concept. Use this skill when: - The linter reports `prefer-test-starter` for *.qunit.html or *.qunit.js files - Test HTML files use manual sap-ui-core.js bootstrapping instead of Test Starter's runTest.js/createSuite.js - Test JS files use Core.ready(), Core.attachInit(), or jsUnitTestSuite instead of sap.ui.define - OPA test HTML files exist with per-test Opa5.extendConfig and manual bootstrapping - An AllJourneys.js orchestrator loads OPA journeys dynamically - OPA journeys call `iStartMyUIComponent` instead of `iStartMyAppInAFrame` - User asks to modernize tests, modernize test infrastructure, or adopt Test Starter Handles unit tests (Core.ready removal, sap.ui.define wrapping) and OPA challenges (page-object imports, Opa5 config, journey orchestration, QUnit 1.x assert modernization, in-window-to-iframe launcher migration). Trigger on: prefer-test-starter warnings, test modernization requests, iStartMyUIComponent.