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POST
/
v1
/
experimental
/
generate_prompt
cURL
curl -X POST https://api.anthropic.com/v1/experimental/generate_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 \
'{
    "task": "a chef for a meal prep planning service",
    "target_model": "claude-3-7-sonnet-20250219"
}'
{
  "messages": [
    {
      "content": "<string>",
      "role": "user"
    }
  ],
  "system": "",
  "usage": {
    "cache_creation": {
      "ephemeral_1h_input_tokens": 0,
      "ephemeral_5m_input_tokens": 0
    },
    "cache_creation_input_tokens": 2051,
    "cache_read_input_tokens": 2051,
    "input_tokens": 1,
    "output_tokens": 1,
    "server_tool_use": {
      "web_fetch_requests": 0,
      "web_search_requests": 0
    },
    "service_tier": "standard"
  }
}
The prompt tools APIs are in a closed research preview. Request to join the closed research preview.

​
Before you begin

The prompt tools are a set of APIs to generate and improve prompts. Unlike our other APIs, this is an experimental API: you’ll need to request access, and it doesn’t have the same level of commitment to long-term support as other APIs. These APIs are similar to what’s available in the Anthropic Workbench, and are intended for use by other prompt engineering platforms and playgrounds.

​
Getting started with the prompt generator

To use the prompt generation API, you’ll need to:
  1. Have joined the closed research preview for the prompt tools APIs
  2. Use the API directly, rather than the SDK
  3. Add the beta header prompt-tools-2025-04-02
This API is not available in the SDK

​
Generate a prompt

Headers

​
anthropic-beta
string[]

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.

​
x-api-key
string
required

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.

Body

application/json
​
task
string
required

Description of the prompt's purpose.

The task parameter tells Claude what the prompt should do or what kind of role or functionality you want to create. This helps guide the prompt generation process toward your intended use case.

Example:

{"task": "a chef for a meal prep planning service"}
​
target_model
string | null
default:""

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"
Required string length: 1 - 256
Example:

"claude-3-7-sonnet-20250219"

Response

Successful Response

​
messages
InputMessage · object[]
required

The response contains a list of message objects in the same format used by the Messages API. Typically includes a user message with the complete generated prompt text, and may include an assistant message with a prefill to guide the model's initial response.

These messages can be used directly in a Messages API request to start a conversation with the generated prompt.

Example:

{
  "messages": [
    {
      "role": "user",
      "content": [
        {
          "type": "text",
          "text": "You are a chef for a meal prep planning service..."
        }
      ]
    },
    {
      "role": "assistant",
      "content": [
        {
          "type": "text",
          "text": "<recipe_planning>"
        }
      ]
    }
  ]
}
​
system
string
default:""
required

Currently, the system field is always returned as an empty string (""). In future iterations, this field may contain generated system prompts.

Directions similar to what would normally be included in a system prompt are included in messages when generating a prompt.

​
usage
Usage · object
required

Usage information