@ai-sdk/anthropic/src/anthropic-error.ts

The **[Anthropic provider](https://ai-sdk.dev/providers/ai-sdk-providers/anthropic)** for the [AI SDK](https://ai-sdk.dev/docs) contains language model support for the [Anthropic Messages API](https://docs.anthropic.com/claude/reference/messages_post).

import {
  createJsonErrorResponseHandler,
  InferSchema,
  lazySchema,
  zodSchema,
} from '@ai-sdk/provider-utils';
import { z } from 'zod/v4';

export const anthropicErrorDataSchema = lazySchema(() =>
  zodSchema(
    z.object({
      type: z.literal('error'),
      error: z.object({
        type: z.string(),
        message: z.string(),
      }),
    }),
  ),
);

export type AnthropicErrorData = InferSchema<typeof anthropicErrorDataSchema>;

export const anthropicFailedResponseHandler = createJsonErrorResponseHandler({
  errorSchema: anthropicErrorDataSchema,
  errorToMessage: data => data.error.message,
});