diff --git a/packages/fabric/core/src/error/tagged-error.ts b/packages/fabric/core/src/error/tagged-error.ts
index 876c87e..c01f0bf 100644
--- a/packages/fabric/core/src/error/tagged-error.ts
+++ b/packages/fabric/core/src/error/tagged-error.ts
@@ -3,14 +3,15 @@ import { TaggedVariant, VariantTag } from "../variant/index.js";
 /**
  * A TaggedError is a tagged variant with an error message.
  */
-export class TaggedError<Tag extends string = string>
+export abstract class TaggedError<Tag extends string = string>
   extends Error
   implements TaggedVariant<Tag>
 {
   readonly [VariantTag]: Tag;
 
-  constructor(tag: Tag) {
-    super();
+  constructor(tag: Tag, message?: string) {
+    super(message);
     this[VariantTag] = tag;
+    this.name = tag;
   }
 }
diff --git a/packages/fabric/core/src/error/unexpected-error.ts b/packages/fabric/core/src/error/unexpected-error.ts
index ba9fa23..a9ee30f 100644
--- a/packages/fabric/core/src/error/unexpected-error.ts
+++ b/packages/fabric/core/src/error/unexpected-error.ts
@@ -8,12 +8,7 @@ import { TaggedError } from "./tagged-error.js";
  * we must be prepared to handle.
  */
 export class UnexpectedError extends TaggedError<"UnexpectedError"> {
-  constructor(readonly context: Record<string, unknown> = {}) {
-    super("UnexpectedError");
-    this.message = "An unexpected error occurred";
-  }
-
-  toString() {
-    return `UnexpectedError: ${this.message}\n${JSON.stringify(this.context, null, 2)}`;
+  constructor(message?: string) {
+    super("UnexpectedError", message);
   }
 }