Skill UI

Practical reference to validate and correct n8n expressions, covering {{ }} usage, $json/$node/$now/$env variables, webhook payload access, and common pitfalls so workflow authors write error-free automations.

A practical decision framework for determining whether to use regular expressions or Large Language Models (LLMs) when parsing structured text (e.g., forms, quizzes, invoices). It recommends starting with deterministic, low-cost regex for 95-98% of structured data, and only invoking expensive LLM calls for identifying and validating ambiguous edge cases, optimizing both cost and accuracy.

This tool scans GitHub Actions workflows and CI/CD configurations to identify critical supply chain attack vectors. It specifically checks for unpinned actions, risks from script injection using expressions, dependency confusion, and secrets exposure, helping organizations harden their build systems against sophisticated threats.

This skill covers the advanced language features introduced in Dart 3, including Pattern Matching, Records, sealed classes, and enhanced control flow structures. Learn how to use `if-case` and switch expressions to write safer, more concise, and idiomatic Dart code, and how to manage complex data shapes using records and patterns.

Use the cron tool to schedule reminders, recurring tasks, or one-time events with simple expressions for intervals, cron syntax, or ISO timestamps; supports listing and removing jobs.

This is an expert guide for writing, debugging, and validating complex expressions within n8n workflows. It covers core variables such as $json, $node, $now, and $env, detailing how to correctly access nested data from current nodes, previous nodes, and webhook payloads. Learn best practices for handling data structures, managing variable scopes, and avoiding common syntax errors to ensure reliable workflow automation.

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.

This utility evaluates complex arithmetic expressions using arbitrary-precision decimal mathematics. It is specifically designed for scientific, financial, or engineering calculations where standard floating-point arithmetic causes unacceptable rounding errors (e.g., 0.1 + 0.2). Supports addition, subtraction, multiplication, division, exponents, and parentheses.

This skill provides expert guidance on writing and executing C# scripts to deeply manipulate Power BI semantic models. It allows users to perform bulk operations, manage security roles (RLS/OLS), format DAX expressions, and query model metadata via the TOM API, supporting both Tabular Editor 2 and 3 environments for advanced data engineering tasks.

This comprehensive guide covers the entire lifecycle of Power Query M expressions within semantic models. Learn how to author correct M code, optimize performance using query folding techniques, validate syntax, and test expressions against live data sources. It provides best practices for data filtering, type handling, and building robust, efficient data pipelines.