Overview
API Studio turns a natural-language description into a private, callable research endpoint. The manual builder is available at critique-labs.ai/en/design. If you want a coding agent to create and integrate the endpoint for you, select Set up an agent beside the API description form. You can copy the setup prompt, open it in ChatGPT or Claude, or download the skill package for Codex, Claude Code, Cursor, and other clients that support agent skills.The manual builder and agent workflow create the same kind of private API.
Endpoints created by an agent appear under Saved designs in API Studio.
Creating an API
1
Describe Your API
Write a natural language description of your desired API functionality:
- Purpose and use cases
- Required inputs and exact output fields
- Research behavior and preferred sources
- How to handle missing or conflicting information
2
Configure Settings
Customize your API configuration:
- Input request format
- Output response format
- Detailed API instructions
3
Test Your API
Test your API with sample requests and responses:
- Enter an input request
- View the output response
- Review the returned source context
- Revise API instructions if needed
4
Integrate
In the Run step, copy the endpoint URL, request schema, example payload,
or generated JavaScript, Python, and cURL code. Keep the API key in the
CRITIQUE_API_KEY environment variable.Build with an agent
See Build APIs with an agent for setup, endpoint lifecycle commands, and the runtime response contract.Best Practices
Writing Descriptions
- Be specific about functionality
- Name every required input
- Define the exact output shape and value types
- State freshness and source requirements
- Explain how to represent missing information
Testing
- Validate all endpoints
- Test edge cases
- Check error responses
- Verify rate limits
Pricing
- $0.50 per million tokens (including internal processing tokens).
- Rate limits exist for the free and pro tiers. See API rate limits and the pricing page for details.