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docs/content/copilot/tutorials/customization-library/prompt-files/document-api.md
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Co-authored-by: Claire W <78226508+crwaters16@users.noreply.github.com>
Co-authored-by: Anne-Marie <102995847+am-stead@users.noreply.github.com>
Co-authored-by: Jules <19994093+jules-p@users.noreply.github.com>
Co-authored-by: Jules Porter <jules-p@users.noreply.github.com>
Co-authored-by: hubwriter <hubwriter@github.com>
Co-authored-by: Robert Sese <734194+rsese@users.noreply.github.com>
2025-10-29 18:30:03 +00:00

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---
title: Document API
intro: 'Generate comprehensive API documentation from your code.'
versions:
feature: copilot
category:
- Prompt files
- Development workflows
- Configure Copilot
complexity:
- Advanced
octicon: copilot
topics:
- Copilot
contentType: tutorials
---
{% data reusables.copilot.prompt-files-preview-note %}
This prompt file generates OpenAPI 3.0 specifications for REST API endpoints by analyzing your API code and creating standardized, machine-readable documentation.
## OpenAPI specification prompt
```text copy
---
mode: 'agent'
description: 'Generate OpenAPI 3.0 specification for API endpoints'
---
## Task
Analyze the API endpoint code and generate a valid OpenAPI 3.0 specification in YAML format.
## OpenAPI Structure
Generate a complete OpenAPI spec including:
1. **OpenAPI Header**
- OpenAPI version (3.0.3)
- API info (title, description, version)
- Server configuration
2. **Path Definitions**
- HTTP method and path
- Operation summary and description
- Tags for organization
3. **Parameters Schema**
- Path parameters with type validation
- Query parameters with constraints and defaults
- Request body schema using proper JSON Schema
- Required vs optional parameters
4. **Response Schemas**
- Success responses (200, 201, etc.) with schema definitions
- Error responses (400, 401, 404, 500) with error schema
- Content-Type specifications
- Realistic example values
5. **Components Section**
- Reusable schemas for request/response models
- Security schemes (Bearer token, API key, etc.)
- Common parameter definitions
## Requirements
- Generate valid OpenAPI 3.0.3 YAML that passes validation
- Use proper JSON Schema for all data models
- Include realistic example values, not placeholders
- Define reusable components to avoid duplication
- Add appropriate data validation (required fields, formats, constraints)
- Include security requirements where applicable
Focus on: ${input:endpoint_focus:Which specific endpoint or endpoints should be documented?}
Generate production-ready OpenAPI specification that can be used with Swagger UI, Postman, and code generators.
```
## How to use this prompt file
1. Save the above content as `document-api.prompt.md` in your `.github/prompts` folder.
1. In {% data variables.product.prodname_vscode %}, display the {% data variables.copilot.copilot_chat_short %} view and enter `/document-api`. Optionally, you can also specify what specific endpoint you want documentation for by typing `endpoint_focus=GET /activities`, for example.
{% data reusables.copilot.prompt-files-further-reading %}