diff --git a/agents/knowledge-base.md b/agents/knowledge-base.md
index af6abfc2a2..13bfe08e7c 100644
--- a/agents/knowledge-base.md
+++ b/agents/knowledge-base.md
@@ -420,6 +420,28 @@ export interface BookingDTO {
 }
 ```
 
+### DTO Location and Naming
+
+**Location**: All DTOs go in `packages/lib/dto/`
+
+**Naming conventions**:
+- Base entity: `{Entity}Dto` (e.g., `BookingDto`)
+- With relations: `{Entity}With{Relations}Dto` (e.g., `BookingWithAttendeesDto`)
+- For specific projections: `{Entity}For{Purpose}Dto` (e.g., `BookingForConfirmationDto`)
+- Avoid: `{Entity}Dto2`, `{Entity}DtoForHandler`, or other use-case-specific names
+
+**Enum/union pattern** – use string literal unions to stay ORM-agnostic:
+
+```typescript
+// ✅ Good - ORM-agnostic string literal union
+export type BookingStatusDto = "CANCELLED" | "ACCEPTED" | "REJECTED" | "PENDING";
+
+// ❌ Bad - importing Prisma enum
+import { BookingStatus } from "@calcom/prisma/client";
+```
+
+**Type safety** – never use `as any` in DTO mapping functions. If types don't align, fix the mapping explicitly.
+
 ### Prisma boundaries
 
 - **Allowed**: `packages/prisma`, repository implementations (`packages/features/**/repositories/*Repository.ts`), and low-level data access infrastructure.