diff --git a/AGENTS.md b/AGENTS.md
index 57ad8ef..daddebf 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -150,6 +150,7 @@ learning_ai_clock/
 | **Backend** | Platform-service (Fastify 5, port 4003) in sibling repo `learning_ai_common_plat` |
 | **Database** | Azure Cosmos DB via `@bytelyst/cosmos` (`productId: "chronomind"`) |
 | **Tests** | Vitest (web, 373 tests), XCTest (iOS, 129 tests), JUnit5 (Android, 30 tests) |
+| **Design system** | `@bytelyst/design-tokens` (CSS custom properties), `@bytelyst/ui` (shared React components) |
 
 ## 4. Coding Conventions
 
@@ -162,6 +163,9 @@ learning_ai_clock/
 - Android engine in `android/app/.../engine/` — pure Kotlin, no Android framework deps
 - Theme tokens use `--cm-*` CSS custom properties (web) or `ChronoMindTheme` (native)
 - Commit messages: `type(scope): description` — types: `feat`, `fix`, `docs`, `refactor`, `test`, `chore`
+- Use `@bytelyst/ui` components (Button, Card, Badge, Toast, etc.) — never build custom equivalents
+- All web colors via `--cm-*` CSS custom properties from `@bytelyst/design-tokens` — never hardcode hex values
+- Every interactive element must have `aria-label` or visible text label
 
 ### MUST NOT do