Backend

Start Flask server locally for development. Runs server in foreground or background with nohup. Use when starting local Python server for testing or development.

This skill should be used when the user requests to audit, check, or generate authentication and authorization protection for Next.js routes, server components, API routes, and server actions. It analyzes existing routes for missing auth checks and generates protection logic based on user roles and permissions. Trigger terms include auth check, route protection, protect routes, secure endpoints, auth middleware, role-based routes, authorization check, api security, server action security, protect pages.

Guides creation of high-quality MCP (Model Context Protocol) servers that enable LLMsto interact with external services through well-designed tools. Use when building MCPservers to integrate external APIs or services, whether in Python (FastMCP) orNode/TypeScript (MCP SDK). Covers tool design, authentication, Docker deployment,and evaluation creation. NOT when consuming existing MCP servers (use the server directly).

Provides idiomatic Go programming expertise and best practices. Ensures clean, efficient, and maintainable code following official Go conventions. Specializes in concurrent programming patterns, interface design, error handling strategies, and performance optimization. Masters standard library usage and ecosystem integration.Use when: writing Go code (.go files), designing interfaces and struct types, implementing concurrent patterns (goroutines/channels), handling errors idiomatically, writing table-driven tests, creating Go modules, optimizing performance-critical code, managing dependencies with go.mod, implementing HTTP servers and clients, working with context propagation, or designing package APIs for public libraries.

Search for Lean 4 and Mathlib theorems, lemmas, and definitions by type signature, name, or subexpression pattern. Use when the user asks to find a theorem, look up a Lean definition, search for lemmas, or needs help discovering Mathlib functions.

Class and method usage analyzer for Pharo Smalltalk. Provides expertise in understanding class responsibilities through class comments (get_class_comment), discovering usage patterns via references (search_references_to_class), finding example methods (exampleXXX patterns), analyzing method usage in context (search_references with polymorphism handling), generating package overviews (list_classes with comment analysis), and resolving ambiguous names (search_classes_like, search_methods_like). Use when understanding what a class does, finding usage examples for classes or methods, discovering how to use an API, analyzing package structure and purpose, resolving unclear class or method names, or learning usage patterns from real-world code.

Query the China Historical GIS (CHGIS) Temporal Gazetteer (TGAZ) API to search for historical Chinese placenames from 222 BCE to 1911 CE. Use this skill when searching for information about historical Chinese places, administrative units, or geographic locations during the dynastic period. Applicable for queries about historical place names, administrative hierarchies, or when users mention specific Chinese locations with historical context.

Set up a fresh Ubuntu VPS for web development with Node.js, Python, Nginx, PM2, SSL, and security hardening. Use when setting up a new server, configuring web hosting, deploying apps, or helping users create a development playground server.

OpenAI SDK development with GPT-5 family, Chat Completions, Responses API, embeddings, and tool calling. Use for AI-powered applications, chatbots, agents, and semantic search.

Rust design patterns and advanced language patterns. Use when designing APIs, implementing complex abstractions, applying type-level programming, or looking for idiomatic solutions to common problems.

Comprehensive Firebase skill for TypeScript/Next.js 16 projects. Use when configuring Firebase services (Firestore Client SDK with aggregations/vector search, Authentication, Storage, Cloud Functions v2, FCM push notifications, App Check bot protection), implementing security rules and indexes, troubleshooting Firebase errors, setting up auth providers (email/password, Google Sign-In), configuring VAPID keys for notifications, custom action URLs, reCAPTCHA Enterprise, replay protection, or resolving permission issues. Covers TypeScript patterns, Next.js 16 SSR/App Router integration, and common pain points like CORS, duplicate documents, notification setup, and bot abuse prevention.

[Extends backend-developer] Kafka specialist for Spring/Reactor. Use for Kafka producers/consumers, DLT, retry mechanisms, transactional outbox, event sourcing. Covers Spring Kafka 4.x and Reactor Kafka 1.3.x. Invoke alongside backend-developer.

Processes images with Sharp, the high-performance Node.js library for resizing, converting, and optimizing images. Use when building image pipelines, generating thumbnails, or optimizing uploads server-side.

Use when the user is exploring possibilities, asking for ideas, or expressing uncertainty. Trigger cues include "ideas", "alternatives", "what could we do", "brainstorm", "different approaches", "I'm not sure yet". Use this skill to generate distinct conceptual directions before any evaluation or refinement.

API versioning strategies for Node.js backends. Use when implementing versioned APIs.

Backend Cloud Run/Express/Firestore do Sr Cardoso. Use quando criar ou alterar endpoints, auth JWT, regras de agenda, financeiro, branding, WhatsApp, cron jobs, ou modelagem Firestore.

Writes E2E and component tests with Cypress including selectors, commands, fixtures, and API testing. Use when testing web applications end-to-end, testing user flows, or writing integration tests.

Expert on Anthropic Claude API, models, prompt engineering, function calling, vision, and best practices. Triggers on anthropic, claude, api, prompt, function calling, vision, messages api, embeddings

Java/Spring Boot conventions for Violet services

Implement authentication with Scalekit for web applications, APIs, and MCP servers. Supports full-stack auth, modular SSO (SAML/OIDC), and MCP OAuth 2.1. Handles login, SSO, session management, token validation, and enterprise identity providers. Works with Node.js, Express, Next.js, Python, FastAPI, and MCP servers. Use when implementing authentication, adding SSO, securing APIs, or protecting MCP servers.