PaulJPhilp
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+description: Always use Effect.Service pattern for service definitions. Never use Context.Tag or Context.GenericTag.
+globs: "**/*.ts"
+alwaysApply: true
+
+# Always Use Effect.Service for Service Definitions
+**Rule:** Always use the `Effect.Service` pattern for defining services. Never use `Context.Tag` or `Context.GenericTag`.
+
+### Why This Rule Exists
+
+The `Effect.Service` pattern is the modern, recommended way to define services in Effect-TS. It provides:
+- Automatic service provision - services are available when you yield them
+- Better type safety and inference
+- Cleaner dependency management
+- Consistent service definition patterns across the codebase
+- Simplified testing - no need to manually provide services
+
+### Anti-Pattern (Forbidden)
+
+```typescript
+// ❌ FORBIDDEN: Using Context.Tag for service definition
+import { Context } from "effect";
+
+export class MyService extends Context.Tag("MyService")<
+  MyService,
+  {
+    readonly doSomething: () => Effect.Effect<void>;
+  }
+>() {}
+
+// ❌ FORBIDDEN: Using Context.GenericTag for service definition
+export const MyService = Context.GenericTag<MyServiceInterface>("MyService");
+
+// ❌ FORBIDDEN: Manual layer creation with Context.Tag
+const MyServiceLive = Layer.succeed(MyService, {
+  doSomething: () => Effect.succeed(undefined),
+});
+```
+
+### Correct Pattern (Required)
+
+#### 1. Synchronous Service (No Dependencies)
+
+```typescript
+// ✅ CORRECT: Use Effect.Service with sync for simple services
+import { Effect } from "effect";
+
+interface MyServiceInterface {
+  readonly doSomething: () => Effect.Effect<void>;
+}
+
+const makeMyService = (): MyServiceInterface => ({
+  doSomething: () => Effect.succeed(undefined),
+});
+
+export class MyService extends Effect.Service<MyService>()("MyService", {
+  sync: () => makeMyService(),
+}) {}
+
+// Usage: Just yield the service - Effect handles provision automatically
+const program = Effect.gen(function* () {
+  const service = yield* MyService;
+  // Use the service
+});
+```
+
+#### 2. Service with Dependencies
+
+```typescript
+// ✅ CORRECT: Use Effect.Service with effect and dependencies
+export class DatabaseService extends Effect.Service<DatabaseService>()(
+  "DatabaseService",
+  {
+    effect: Effect.gen(function* () {
+      const config = yield* ConfigService; // Effect.Service automatically infers ConfigService as a dependency
+      return createDatabase(config);
+    }),
+    // ✅ CORRECT: No dependencies array needed - Effect.Service infers dependencies automatically
+  }
+) {}
+
+// Usage: Just yield the service - Effect handles provision automatically
+```
+
+#### 3. Service with Scoped Resources
+
+```typescript
+// ✅ CORRECT: Use Effect.Service with scoped for resource management
+export class DatabaseService extends Effect.Service<DatabaseService>()(
+  "DatabaseService",
+  {
+    scoped: Effect.gen(function* () {
+      const config = yield* ConfigService; // Effect.Service automatically infers ConfigService as a dependency
+      return yield* Effect.acquireRelease(
+        () => createConnection(config),
+        (connection) => connection.close()
+      );
+    }),
+    // ✅ CORRECT: No dependencies array needed - Effect.Service infers dependencies automatically
+  }
+) {}
+```
+
+#### 4. Service with Accessors
+
+```typescript
+// ✅ CORRECT: Enable accessors for convenient static access
+export class LoggerService extends Effect.Service<LoggerService>()(
+  "LoggerService",
+  {
+    accessors: true,
+    sync: () => ({
+      log: (message: string) => Effect.sync(() => console.log(message)),
+    }),
+  }
+) {}
+
+// Usage: LoggerService.log("message") - static accessor available
+```
+
+### Migration from Context.Tag
+
+When migrating existing services:
+
+1. **Replace Context.Tag/GenericTag with Effect.Service class**
+2. **Move implementation to `sync`, `effect`, or `scoped` property**
+3. **Remove manual Layer creation** - Effect.Service handles it automatically
+4. **Remove all `.Default` usage** - Never explicitly use `.Default`
+5. **Just yield services** - Services are automatically available when you yield them
+
+**Example Migration:**
+
+```typescript
+// Before (❌ FORBIDDEN)
+export const StateStore = Context.GenericTag<StateStoreService>("StateStore");
+const makeStateStore = (): StateStoreService => { /* ... */ };
+export const StateStoreLive = Layer.succeed(StateStore, makeStateStore());
+
+// Usage (❌ FORBIDDEN)
+Effect.provide(program, StateStoreLive);
+
+// After (✅ CORRECT)
+const makeStateStore = (): StateStoreService => { /* ... */ };
+export class StateStore extends Effect.Service<StateStore>()("StateStore", {
+  sync: () => makeStateStore(),
+}) {}
+
+// Usage (✅ CORRECT)
+// Just yield the service - Effect handles provision automatically
+const program = Effect.gen(function* () {
+  const store = yield* StateStore;
+  // Use the service
+});
+Effect.runPromise(program); // Service is automatically provided
+```
+
+### Exception: Test Mocks
+
+Test mocks may use `Context.Tag` for isolated test scenarios, but production service definitions must always use `Effect.Service`:
+
+```typescript
+// ✅ ACCEPTABLE: Test-only mock using Context.Tag
+const MockDisplayService = Context.Tag<{ isMocked: true }>();
+```
+
+**Explanation:**  
+The `Effect.Service` pattern is the standard way to define services in Effect-TS. It provides better type safety, automatic layer generation, and consistent patterns across the codebase. Using `Context.Tag` or `Context.GenericTag` directly is deprecated in favor of the `Effect.Service` pattern.
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+description: Never use 'as any' type assertions - they bypass TypeScript's type safety.
+globs: "**/*.ts"
+alwaysApply: true
+
+# Never Use 'as any' Type Assertions
+**Rule:** Never use `as any` type assertions. They bypass TypeScript's type safety and are an anti-pattern.
+
+### Why This Is Forbidden
+
+Using `as any` disables TypeScript's type checking, which defeats the purpose of using a type-safe language. It can lead to:
+- Runtime errors that could have been caught at compile time
+- Loss of IDE autocomplete and type hints
+- Hidden bugs that surface in production
+- Reduced code maintainability
+
+### Anti-Pattern (Forbidden)
+
+```typescript
+// ❌ FORBIDDEN: Using 'as any' to bypass type checking
+const result = someFunction() as any;
+const value = (someOption as any).value;
+const effect = someEffect.gen(function* () {
+  // ...
+}) as any;
+```
+
+### Correct Approaches
+
+#### 1. Fix Type Mismatches Properly
+
+If you encounter type errors, fix the underlying issue:
+
+```typescript
+// ✅ CORRECT: Fix the type definition or use proper type narrowing
+const result: ExpectedType = someFunction();
+const value = Option.isSome(someOption) ? someOption.value : defaultValue;
+```
+
+#### 2. Use Type Guards
+
+```typescript
+// ✅ CORRECT: Use type guards for runtime type checking
+function isExpectedType(value: unknown): value is ExpectedType {
+  return typeof value === "object" && value !== null && "property" in value;
+}
+
+if (isExpectedType(value)) {
+  // TypeScript knows value is ExpectedType here
+  console.log(value.property);
+}
+```
+
+#### 3. Use Proper Type Assertions
+
+If you must assert a type, use a more specific assertion:
+
+```typescript
+// ✅ CORRECT: Use specific type assertions when you're certain
+const result = someValue as SpecificType;
+// Or use type predicates
+const result = someValue as unknown as SpecificType;
+```
+
+#### 4. Fix Dependency Version Conflicts
+
+If type errors are caused by multiple versions of the same library:
+
+```typescript
+// ✅ CORRECT: Resolve dependency conflicts at the package level
+// Update package.json to use consistent versions
+// Use workspace hoisting or resolution strategies
+```
+
+#### 5. Use Effect's Type System Properly
+
+For Effect-specific type issues:
+
+```typescript
+// ✅ CORRECT: Use Effect's type system features
+const effect = Effect.gen(function* () {
+  const value = yield* someEffect;
+  return value;
+});
+
+// ✅ CORRECT: Use Effect.map, Effect.flatMap, etc. for type transformations
+const transformed = effect.pipe(
+  Effect.map((value) => value.property)
+);
+```
+
+**Explanation:**  
+Type safety is one of TypeScript's core benefits. Using `as any` throws away this protection and should never be used. Always fix the underlying type issue instead of bypassing it.