What are the prerequisites for using Reverse API Engineer?

You must have the Playwright MCP installed for browser control and Python available on your system to execute the analysis scripts and test the generated clients.

What quality of code does the generator produce?

The skill generates production-grade Python code that includes PEP 484 type hints, comprehensive docstrings, robust error handling, and session-based request management.

How does the skill handle large, noisy HAR files?

It utilizes a specialized har_filter.py script that automatically removes static assets, tracking scripts, and CDN traffic, often reducing file size by 90% to focus on core API logic.

Can this skill handle authenticated web sessions?

Yes, it is designed to observe login flows during the browser capture phase, identifying token patterns and required headers to replicate authentication in the final API client.

Does it support GraphQL and REST?

Yes, it analyzes XHR and Fetch requests regardless of the architectural style, extracting schemas from JSON payloads for both RESTful endpoints and GraphQL queries.

Reverse API Engineer

Name: Reverse API Engineer
Author: kalil0321

bykalil0321

•

284

•

Web Scraping & Data Collection

Transforms browser traffic into production-ready Python API clients through automated HAR analysis and code generation.

The Reverse API Engineer skill automates the process of reverse-engineering web APIs by capturing network traffic (HAR files) via browser automation and converting those interactions into structured, maintainable Python code. It streamlines the developer workflow by filtering out noise such as analytics and static assets, automatically detecting authentication patterns, and mapping complex request/response schemas. This skill is essential for developers who need to interact with undocumented APIs, automate website workflows, or transition from fragile web scraping to robust, API-based integrations.

Key Features

01Automated HAR capture and noise filtering to isolate relevant API traffic

02Built-in validation engine to verify implementation coverage against captured data

03Generation of type-hinted Python clients with session management and error handling

04284 GitHub stars

05Domain mapping and sitemap parsing for comprehensive discovery of site structures

06Structural endpoint analysis including authentication and pagination detection

Use Cases

01Automating multi-step web interactions like secure logins and data exports

02Developing API clients for websites that lack official public documentation

03Replacing legacy web scrapers with high-performance, direct API integration scripts

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add kalil0321/reverse-api-engineer reverse-engineering-api

For use in Claude.ai and ChatGPT

Download Skill