=== AI SDK Bug Reproduction ===

Input messages we provide to AI SDK:
Message 0 (user): {
  "role": "user",
  "content": "generate 10 items"
}
Message 1 (assistant): {
  "role": "assistant",
  "content": [
    {
      "type": "tool-call",
      "toolCallId": "tool-example-123",
      "toolName": "json",
      "input": {
        "message": "generate 10 items"
      }
    },
    {
      "type": "text",
      "text": "I generated code for 10 items."
    }
  ]
}
Message 2 (tool): {
  "role": "tool",
  "content": [
    {
      "type": "tool-result",
      "toolCallId": "tool-example-123",
      "toolName": "json",
      "output": {
        "type": "json",
        "value": {
          "code": "export const code = () => [...]",
          "packageJson": "{}"
        }
      }
    }
  ]
}
Message 3 (user): {
  "role": "user",
  "content": "generate 100 items"
}

=== Calling AI SDK generateObject ===

ERROR (expected):
{
  "name": "AI_APICallError",
  "url": "https://api.anthropic.com/v1/messages",
  "requestBodyValues": {
    "model": "claude-4-sonnet-20250514",
    "max_tokens": 4096,
    "system": [
      {
        "type": "text",
        "text": "You are a helpful assistant. Respond with JSON."
      }
    ],
    "messages": [
      {
        "role": "user",
        "content": [
          {
            "type": "text",
            "text": "generate 10 items"
          }
        ]
      },
      {
        "role": "assistant",
        "content": [
          {
            "type": "tool_use",
            "id": "tool-example-123",
            "name": "json",
            "input": {
              "message": "generate 10 items"
            }
          },
          {
            "type": "text",
            "text": "I generated code for 10 items."
          }
        ]
      },
      {
        "role": "user",
        "content": [
          {
            "type": "tool_result",
            "tool_use_id": "tool-example-123",
            "content": "{\"code\":\"export const code = () => [...]\",\"packageJson\":\"{}\"}"
          },
          {
            "type": "text",
            "text": "generate 100 items"
          }
        ]
      }
    ],
    "tools": [
      {
        "name": "json",
        "description": "Respond with a JSON object.",
        "input_schema": {
          "type": "object",
          "properties": {
            "response": {
              "type": "string",
              "description": "Your response to the user"
            }
          },
          "required": [
            "response"
          ],
          "additionalProperties": false,
          "$schema": "http://json-schema.org/draft-07/schema#"
        }
      }
    ],
    "tool_choice": {
      "type": "tool",
      "name": "json"
    }
  },
  "statusCode": 400,
  "responseHeaders": {
    "anthropic-organization-id": "afeff4d1-2dba-4bc5-93e7-afacdc41d499",
    "cf-cache-status": "DYNAMIC",
    "cf-ray": "975a040f5f30ca29-OTP",
    "connection": "keep-alive",
    "content-length": "306",
    "content-type": "application/json",
    "date": "Wed, 27 Aug 2025 07:57:03 GMT",
    "request-id": "req_011CSXrhod7Lyo6xF9pjaGJh",
    "server": "cloudflare",
    "strict-transport-security": "max-age=31536000; includeSubDomains; preload",
    "via": "1.1 google",
    "x-envoy-upstream-service-time": "15",
    "x-robots-tag": "none",
    "x-should-retry": "false"
  },
  "responseBody": "{\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1: `tool_use` ids were found without `tool_result` blocks immediately after: tool-example-123. Each `tool_use` block must have a corresponding `tool_result` block in the next message.\"},\"request_id\":\"req_011CSXrhod7Lyo6xF9pjaGJh\"}",
  "isRetryable": false,
  "data": {
    "type": "error",
    "error": {
      "type": "invalid_request_error",
      "message": "messages.1: `tool_use` ids were found without `tool_result` blocks immediately after: tool-example-123. Each `tool_use` block must have a corresponding `tool_result` block in the next message."
    }
  }
}

✅ BUG REPRODUCED: This confirms AI SDK is combining messages incorrectly
The error indicates Claude received malformed messages despite our correct input