Skill UI

Presents advanced TypeScript techniques—generics, conditional types, mapped types, discriminated unions, and utility combinations—to help developers build safer, more expressive type systems and runtime guards for complex apps.

Polars is a blazing fast in-memory DataFrame library based on Apache Arrow that replaces pandas for 1-100GB workloads, offering expression-based lazy execution, parallel operators, and rich I/O for ETL pipelines.

Automatically scans modern API frameworks (Next.js, Express, FastAPI, Django) to generate comprehensive, ready-to-run test suites. It ensures complete coverage for critical areas including authentication, input validation (boundary/injection), error code matrices, pagination, file uploads, and rate limiting. Ideal for TDD, contract testing, and security audits.

Enables production-grade Stripe integrations across Next.js, Express, and Django with subscriptions, proration-aware upgrades/downgrades, usage-based billing, checkout sessions, idempotent webhooks, customer portals, and invoice automation for SaaS billing flows.

Scans GitHub Actions workflows and CI/CD pipeline files to flag unpinned actions, expressions that may inject scripts, dependency confusion, and exposed secrets while automating audits for analysts hardening build systems.

Guides applying Dart 3 branches, patterns, pattern types, and records when writing Flutter/Dart code, covering if-case, switch expressions, guards, and record usage to encourage correct, exhaustive handling in control-flow and destructuring scenarios.

This guide provides an expert resource for writing and debugging correct expressions within n8n workflows. It details how to use the {{...}} syntax to access dynamic data from various sources, including the current node output ($json), data from previous nodes ($node), environment variables ($env), and handling complex webhook payload structures. Essential for reliable workflow automation.

This expert guide provides comprehensive knowledge for interpreting and systematically resolving validation errors within n8n workflows. It covers various error types (e.g., missing required fields, type mismatches, invalid expressions) and outlines best practices for iterative validation, including understanding different validation profiles like 'runtime' and 'strict' for various deployment stages. Ideal for debugging complex automation logic.

This skill provides advanced, deep-dive debugging capabilities for failing Power Automate cloud flows using the FlowStudio MCP server. Unlike standard API calls that only show top-level status codes, this tool retrieves action-level inputs, outputs, and detailed error information. Use it to find the true root cause of complex failures, diagnose expression errors, check connector authentication issues, or trace intricate flow execution paths.

A comprehensive methodology for pinpointing the root cause of complex bugs, regressions, or unexpected behavior in large codebases. Techniques include binary search debugging, Git bisect for tracking regressions across commits, strategic data/control flow logging, component isolation, and advanced breakpoint strategies (conditional breakpoints, watch expressions). Ideal for scenarios where the bug source is unclear or difficult to reproduce.