Extract Openapi From Code

What it does

This skill automatically generates OpenAPI specifications directly from existing codebases. It analyzes your implementation to map out endpoints, request/response schemas, and authentication flows without manual documentation.

When to use it

• You need to document a legacy API where original specs are missing or outdated.
• You want to ensure your AI agents understand the exact structure of your backend services.
• You are refactoring code and need to verify that new implementations match expected API contracts.
• You require machine-readable documentation for rapid client SDK generation.

Key capabilities

• Parses source code to identify HTTP methods, paths, and parameters.
• Infers data models and validation rules from typed variables and function signatures.
• Outputs standard OpenAPI 3.x format compatible with major tools like Swagger UI.
• Handles complex scenarios including authentication headers and file uploads.

Example prompts

"Extract an OpenAPI spec from my Python FastAPI application located in the src directory." "Generate an OpenAPI document from this Node.js Express server code to help my AI agent interact with it." "Analyze my Go HTTP handlers and create a corresponding OpenAPI specification file."

Tips & gotchas

Ensure your codebase includes type hints or explicit struct definitions, as the extraction relies on these for accurate schema generation. Review the output carefully, as inferred logic may occasionally miss edge cases present only in runtime behavior.