Production-grade tabular data manipulation using pandas & openpyxl. This skill should be used when editing, creating, filtering, sorting, merging, pivoting, deduplicating, validating, or transforming CSV, Excel (xlsx/xls), JSON, Parquet, or TSV files. Supports 18 operations via CLI scripts, advanced Excel formatting (multi-sheet, freeze, auto-filter, validation, styling), and file-converter integration for format pipelines.

Efficiently navigate codebase documentation during Research phase. Use instead of Grep/Glob for finding architectural decisions, feature specs, and technical docs. Maps topics to doc locations for fast context retrieval. If codebase lacks documentation structure, provides patterns to establish one.

Convert & transform files - images (resize, format, HEIC), markdown (PDF/HTML), data (CSV/JSON/YAML/TOML/XML), SVG, base64, text encoding. Cross-platform, single & batch mode. This skill should be used when converting file formats, resizing images, generating PDFs from markdown, or transforming data between formats.

Comprehensive MongoDB Atlas + mongosh skill for performance auditing, all index types (b-tree/text/2dsphere/hashed/TTL/partial/wildcard/Atlas-Search/Vector-Search), Performance Advisor analysis, query explain, schema advice, backup status, alerts, week-over-week diffs, and additive index creation. Read-only by default; create-index ops gated behind explicit `--confirm`. Hard-blocks any destructive op (delete, drop, restore, pause, terminate, kill, dbuser write, network change). Works against Atlas Cloud (full feature set) and self-hosted/local mongo (mongosh-based subset).

Senior Next.js 15+/16 Engineer skill for App Router. Use when scaffolding production apps, enforcing RSC patterns, auditing codebases, or optimizing performance.

Official skills from Obsidian for vault management and content operations.

Generate SEO-optimized competitor comparison and alternatives pages. Covers "X vs Y" layouts, "alternatives to X" pages, feature matrices, schema markup, and conversion optimization. Use when user says "comparison page", "vs page", "alternatives page", "competitor comparison", or "X vs Y".

This skill explains the 3 test levels (Unit, Integration, E2E) using the "Building a Car" analogy and provides guidance on when to use each type. Includes project-specific Playwright examples.

Production-grade testing strategies for robust, maintainable systems. Covers unit/integration/E2E testing, contract testing, accessibility, mutation testing, and CI/CD patterns. Supports Python (pytest) and TypeScript (Jest/Vitest/Playwright).

Reduce token count in prompts, docs, and prose. Covers prompt compression (40-60% savings), doc formatting, TOON data serialization, and Strunk's prose clarity rules. Use when compressing prompts, optimizing docs for LLM context, or writing clear technical prose.

Security-focused static analysis and code auditing skills from Trail of Bits. Includes CodeQL deep analysis, Semgrep scanning, and SARIF result processing. Use when performing security audits, running static analysis, scanning for vulnerabilities, or processing scan results.

Comprehensive UX/UI evaluation meta-skill combining design theory and UX methodology. Use when conducting UI/UX audits, visual design reviews, accessibility compliance (WCAG 2.2), user flow analysis, responsive testing, interaction design evaluation, or design system audits. Evaluates using Nielsen's heuristics, Gestalt principles, typography theory, color theory, and modern methodologies (OOUX, JTBD, Cognitive Walkthrough).

Safely upgrade JavaScript packages with breaking change detection, migration guidance, and automated code migrations (npm/pnpm/yarn). Cross-platform with git safety branch enforcement.

Web quality optimization skills based on Google Lighthouse guidelines and Core Web Vitals. Use when asked to audit web quality, optimize performance, improve accessibility, fix SEO, apply best practices, or analyze Core Web Vitals (LCP, INP, CLS).