What problem does it solve? Frontend and backend codebases drift apart over time, causing runtime failures from mismatched field names, enums, and payload structures between the Flutter app and Firebase Functions. This Skill systematically audits every cross-stack interface to surface inconsistencies before they reach production. ## Core Features & Use Cases - Paired File Comparison: Reads 11 defined frontend-backend file pairs (checkout, orders, products, auth, shipping, subscriptions, returns, notifications) and compares field names, types, enums, error handling, and response formats. - Schema Constant Verification: Checks that schema_constants.dart and schema_constants.py remain identical, plus field-by-field comparison of generated Dart models against Python models. - Standardized Mismatch Reporting: Reports every inconsistency in a standard MISMATCH format for easy triage. - Use Case: After adding a new order field in the Python handler, run the audit to confirm the Dart order models and checkout provider send and parse the same field name and type. ## Quick Start Ask the assistant to run a full-stack audit of the Flutter app against the Firebase Functions backend and report all field and enum mismatches.