diff --git a/packages/core/src/entities/errors/auth.ts b/packages/core/src/entities/errors/auth.ts
new file mode 100644
index 0000000..39cbb76
--- /dev/null
+++ b/packages/core/src/entities/errors/auth.ts
@@ -0,0 +1,17 @@
+export class AuthenticationError extends Error {
+  constructor(message: string, options?: ErrorOptions) {
+    super(message, options);
+  }
+}
+
+export class UnauthenticatedError extends Error {
+  constructor(message: string, options?: ErrorOptions) {
+    super(message, options);
+  }
+}
+
+export class UnauthorizedError extends Error {
+  constructor(message: string, options?: ErrorOptions) {
+    super(message, options);
+  }
+}
diff --git a/packages/core/src/entities/errors/common.ts b/packages/core/src/entities/errors/common.ts
new file mode 100644
index 0000000..ee3e94d
--- /dev/null
+++ b/packages/core/src/entities/errors/common.ts
@@ -0,0 +1,11 @@
+export class NotFoundError extends Error {
+  constructor(message: string, options?: ErrorOptions) {
+    super(message, options);
+  }
+}
+
+export class InputParseError extends Error {
+  constructor(message: string, options?: ErrorOptions) {
+    super(message, options);
+  }
+}
diff --git a/packages/core/src/entities/errors/index.ts b/packages/core/src/entities/errors/index.ts
new file mode 100644
index 0000000..edb5fbd
--- /dev/null
+++ b/packages/core/src/entities/errors/index.ts
@@ -0,0 +1,6 @@
+export {
+  AuthenticationError,
+  UnauthenticatedError,
+  UnauthorizedError,
+} from "./auth.js";
+export { NotFoundError, InputParseError } from "./common.js";
diff --git a/packages/core/src/entities/index.ts b/packages/core/src/entities/index.ts
new file mode 100644
index 0000000..fd3412e
--- /dev/null
+++ b/packages/core/src/entities/index.ts
@@ -0,0 +1,2 @@
+export * from "./models/index.js";
+export * from "./errors/index.js";