Evidence-first mailbox triage, drafting, send verification, and sent-mail-safe follow-up workflow for ECC. Use when the user wants to organize email, draft or send through the real mail surface, or prove what landed in Sent.

Write articles, guides, blog posts, tutorials, newsletter issues, and other long-form content in a distinctive voice derived from supplied examples or brand guidance. Use when the user wants polished written content longer than a paragraph, especially when voice consistency, structure, and credibility matter.

Clean up merged branches locally and on remote, keeping only main, dev, and gh-pages.

Design multi-stage CI/CD pipelines with approval gates, security checks, and deployment orchestration. Use when architecting deployment workflows, setting up continuous delivery, or implementing GitOps practices.

Guide and audit Node.js CLI application development against 37 established best practices covering UX, distribution, interoperability, accessibility, testing, error handling, development setup, analytics, versioning, and security. Use this skill when building, extending, reviewing, or scaffolding a Node.js CLI — including when someone says "audit my CLI", "review my CLI code", "I'm building a CLI tool", or asks about adding argument parsing, error handling, color output, STDIN, --json flags, exit codes, --version flags, or npm publishing. Applies even when best practices are not explicitly mentioned. Also trigger for "how should I implement X in my CLI" or "what's the right way to do Y in a Node.js CLI". Do NOT use for Node.js backend or API development with no CLI entry point.

Proactively searches the Tessl registry for best-practice tiles before starting work that involves frameworks, libraries, or technologies where conventions matter. Triggers automatically when about to write tests, configure CI, set up auth, handle errors, design APIs, write database migrations, configure Docker, set up linting, or work with any framework or technology. Also triggers when the agent thinks "I should check if there are established best practices for this." Do NOT use for trivial edits, renaming variables, or tasks that don't involve technology-specific conventions. Requires Tessl MCP tools: search and install.

Apply this skill when designing, building, or reviewing API routes, Server Actions, or data fetching patterns in a Next.js + TypeScript + Drizzle application. Triggers on requests like "create an API endpoint", "add a server action", "design the API", "add pagination", "handle this request", "validate query params", or any time you are building the boundary between client and server. Use proactively — all API design decisions should follow these patterns.

Apply this skill when writing, reviewing, or planning tests for a Next.js + TypeScript + Drizzle application using Vitest, React Testing Library, MSW, and Playwright. Triggers on requests like "write tests for", "add test coverage", "test this component", "test this hook", "test this API route", "add E2E tests", "is this testable", or any time you are building features that need verification. Use proactively — all new features should include tests.

Apply this skill when writing, reviewing, or refactoring any code in a React + TypeScript + Tailwind + shadcn + Drizzle project. Triggers on requests like "review this code", "refactor this component", "is this good practice", "write a hook for", "clean this up", "add types to", "write a form", or any time you are producing code that should meet production standards. Use proactively — all generated code should conform to these standards without being asked.

Apply this skill when building, optimising, or reviewing components, data fetching, or database queries in a Next.js App Router + TypeScript + Tailwind + shadcn + Drizzle application where performance matters. Triggers on requests like "optimise this", "this is slow", "reduce re-renders", "improve load time", "this list is laggy", "bundle is too large", "slow query", or any time you are building features that involve large lists, frequent updates, heavy computations, or significant data volumes. Use proactively for anything rendering more than ~50 items or running on every keystroke.

Gemini CLI Core - Core functionality library for the open-source AI agent that brings the power of Gemini directly into your terminal.

Spatial econometric regression models for analyzing geographically-related data interactions.

A comprehensive machine learning library providing supervised and unsupervised learning algorithms with consistent APIs and extensive tools for data preprocessing, model evaluation, and deployment.

Python compatibility wrapper for computing string edit distances and similarities using fast Levenshtein algorithms.

Pure Python COM package for Windows COM automation and interoperability

Python implementation of WebRTC and ORTC for real-time peer-to-peer communication

Fiona reads and writes spatial data files

A CSS Modules transform to extract local aliases for inline imports

A slightly nicer interface to Postgres over node-libpq providing both sync and async operations

Babel plugin that compiles ES2015 computed properties to ES5-compatible code