curl -X POST https://api.anthropic.com/v1/experimental/improve_prompt \
     --header "x-api-key: $ANTHROPIC_API_KEY" \
     --header "anthropic-version: 2023-06-01" \
     --header "anthropic-beta: prompt-tools-2025-04-02" \
     --header "content-type: application/json" \
     --data \
'{
    "messages": [{"role": "user", "content": [{"type": "text", "text": "Create a recipe for {{food}}"}]}],
    "system": "You are a professional chef",
    "feedback": "Make it more detailed and include cooking times",
    "target_model": "claude-3-7-sonnet-20250219"
}'

{
  "messages": [
    {
      "content": [
        {
          "text": "<improved prompt>",
          "type": "text"
        }
      ],
      "role": "user"
    },
    {
      "content": [
        {
          "text": "<assistant prefill>",
          "type": "text"
        }
      ],
      "role": "assistant"
    }
  ],
  "system": "",
  "usage": [
    {
      "input_tokens": 490,
      "output_tokens": 661
    }
  ]
}