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Optional header to specify the beta version(s) you want to use.

To use multiple betas, use a comma separated list like beta1,beta2 or specify the header multiple times for each beta.

Your unique API key for authentication.

This key is required in the header of all API requests, to authenticate your account and access Anthropic's services. Get your API key through the Console. Each key is scoped to a Workspace.

The prompt to improve, structured as a list of message objects.

Each message in the messages array must:

• Contain only text-only content blocks
• Not include tool calls, images, or prompt caching blocks

As a simple text prompt:

[
  {
    "role": "user", 
    "content": [
      {
        "type": "text",
        "text": "Concise recipe for {{food}}"
      }
    ]
  }
]

With example interactions to guide improvement:

[
  {
    "role": "user", 
    "content": [
      {
        "type": "text",
        "text": "Concise for {{food}}.\n\nexample\mandu: Put the mandu in the air fryer at 380F for 7 minutes."
      }
    ]
  }
]

Note that only contiguous user messages with text content are allowed. Assistant prefill is permitted, but other content types will cause validation errors.

Feedback for improving the prompt.

Use this parameter to share specific guidance on what aspects of the prompt should be enhanced or modified.

Example:

{
  "messages": [...],
  "feedback": "Make the recipes shorter"
}

When not set, the API will improve the prompt using general prompt engineering best practices.

The existing system prompt to incorporate, if any.

{
  "system": "You are a professional meal prep chef",
  [...]
}

Note that while system prompts typically appear as separate parameters in standard API calls, in the improve_prompt response, the system content will be incorporated directly into the returned user message.

The model this prompt will be used for. This optional parameter helps us understand which models our prompt tools are being used with, but it doesn't currently affect functionality.

Example:

"claude-3-7-sonnet-20250219"