Systematic debugging for Encore.ts backend incidents using diagnostic scripts, database queries, and structured logging. Use when backend tests fail, services crash, or async flows stall.

Comprehensive backend development workflow that orchestrates expert analysis, architecture design, implementation, and deployment using the integrated toolset. Handles everything from API design and database architecture to security implementation and DevOps automation.

Senior Backend Developer with 10+ years Java and 5+ years Spring Boot experience. Use when implementing Spring Boot features, writing Java code, creating REST APIs, working with databases (R2DBC, JPA), implementing business logic, or writing unit/integration tests.

Orchestrate end-to-end backend feature development from requirements to deployment. Use when coordinating multi-phase feature delivery across teams and services.

Production backend systems development. Stack: Node.js/TypeScript, Python, Go, Rust | NestJS, FastAPI, Django, Express | PostgreSQL, MongoDB, Redis. Capabilities: REST/GraphQL/gRPC APIs, OAuth 2.1/JWT auth, OWASP security, microservices, caching, load balancing, Docker/K8s deployment. Actions: design, build, implement, secure, optimize, deploy, test APIs and services. Keywords: API design, REST, GraphQL, gRPC, authentication, OAuth, JWT, RBAC, database, PostgreSQL, MongoDB, Redis, caching, microservices, Docker, Kubernetes, CI/CD, OWASP, security, performance, scalability, NestJS, FastAPI, Express, middleware, rate limiting. Use when: designing APIs, implementing auth/authz, optimizing queries, building microservices, securing endpoints, deploying containers, setting up CI/CD.

Generate production-ready REST or GraphQL endpoints with request validation, error handling, and comprehensive tests.

Build robust backend systems with modern technologies (Node.js, Python, Go, Rust), frameworks (NestJS, FastAPI, Django), databases (PostgreSQL, MongoDB, Redis), APIs (REST, GraphQL, gRPC), authentication (OAuth 2.1, JWT), testing strategies, security best practices (OWASP Top 10), performance optimization, scalability patterns (microservices, caching, sharding), DevOps practices (Docker, Kubernetes, CI/CD), and monitoring. Use when designing APIs, implementing authentication, optimizing database queries, setting up CI/CD pipelines, handling security vulnerabilities, building microservices, or developing production-ready backend systems.

Ultimate 25+ years expert-level backend skill covering FastAPI, Express, Node.js, Next.js with TypeScript. Includes ALL databases (PostgreSQL, MongoDB, Redis, Elasticsearch), ALL features (REST, GraphQL, WebSockets, gRPC, Message Queues), comprehensive security hardening (XSS, CSRF, SQL injection, authentication, authorization, rate limiting), complete performance optimization (caching, database tuning, load balancing), ALL deployment strategies (Docker, Kubernetes, CI/CD), advanced patterns (microservices, event-driven, saga, CQRS), ALL use cases (e-commerce, SaaS, real-time, high-traffic), complete testing (unit, integration, E2E, load, security). Route protection, middleware, authentication implementation in PERFECTION. Use for ANY backend system requiring enterprise-grade security, performance, scalability, and architectural excellence.

Enforces Go backend best practices following clean architecture, dependency injection, and test-driven development. Automatically applied for Go backend implementation, API development, and microservices construction.

Explain backend service strategy and rules to respect all over any realization.

Master skill for TypeScript backend development. Decision framework for APIs (tRPC/REST), authentication (Auth.js/Passport), database (Prisma), validation (Zod), logging (Pino), testing (Vitest), and deployment (Docker). Routes to specialized skills for implementation. Use as entry point for any backend task.

Create and manage database schema migrations with reversible changes, clear naming, and safe deployment practices. Use this skill when writing database migration files, modifying database schemas, creating migration scripts, or managing database version control. When working on migration files in database migration directories, files defining schema changes (CREATE TABLE, ALTER TABLE, DROP TABLE), migration rollback/down methods, database index creation scripts, seed data or data migration files, ORM migration configurations (Prisma, Drizzle, TypeORM), or files handling database versioning and migration history.

backend-nodejs

High-performance structured JSON logging for Node.js. Use when building production APIs that need fast, structured logs for observability platforms (Datadog, ELK, CloudWatch). Provides request logging middleware, child loggers for context, and sensitive data redaction. Choose Pino over console.log for any production TypeScript backend.

Implement comprehensive testing strategies with pytest, fixtures, mocking, and test-driven development for FastAPI applications. Use when writing Python tests, setting up test suites, or implementing testing best practices.

Runs formatting, linting, and tests for the backend.

Expert in secure backend coding practices specializing in input

Generate OpenAPI/REST endpoints from tRPC routers. Use when you have a tRPC API but need to expose REST endpoints for third-party integrations, mobile apps, or public API documentation. Provides automatic Swagger UI and OpenAPI spec generation. Choose this when you want type-safe internal APIs (tRPC) with REST fallback for external consumers.

Fast unit testing framework for TypeScript/JavaScript. Use for testing tRPC procedures, Zod schemas, utility functions, and any TypeScript code. Built on Vite with native ESM, TypeScript support, and Jest-compatible API. Choose Vitest over Jest for modern TypeScript projects, especially with Vite-based setups.

Expert backlog manager that prioritizes work using multi-criteria scoring, analyzes dependencies, and recommends optimal next tasks. Activates when managing backlogs, prioritizing work, adding items, or analyzing what to work on next.

Bulk backlog scanner that analyzes the entire finans codebase vs CLAUDE.md, identifies ALL gaps, and generates a comprehensive, prioritized, numbered task backlog. Uses broad→narrow pattern.

Build Backstage backend plugins with createBackendPlugin and core services: DI, httpRouter, secure-by-default auth, Knex DB, routes, testing. Use for APIs and background jobs.

Build Backstage frontend plugins with the new Frontend System: createFrontendPlugin, blueprints, routes, Utility APIs, testing. Use for pages, nav, entity content, or cards.

BackstopJS visual regression testing for self-hosted visual comparison

Converting backtest visualizations from bar indices/timesteps to actual datetime axes for clearer time context

Comprehensive guidance for interpreting backtest results and detecting overfitting (project)

Designs backup and disaster recovery strategies for data and systems

Comprehensive guide to backward compatibility rules for APIs, databases, and data contracts with migration strategies and testing approaches

Create MicroPython applications for Universe 2025 (Tufty) Badge including display graphics, button handling, and MonaOS app structure. Use when building badge apps, creating interactive displays, or developing MicroPython programs.

Generates production-ready BAML applications from natural language requirements. Creates complete type definitions, functions, clients, tests, and framework integrations for data extraction, classification, RAG, and agent workflows. Queries official BoundaryML repositories via MCP for real-time patterns. Supports multimodal inputs (images, audio), 6 programming languages (Python, TypeScript, Ruby, Java, Go, C#), 10+ frameworks, 50-70% token optimization, and 95%+ compilation success.

Generate advertising banners and creatives for various platforms (X, Facebook, Instagram, PRTimes, YouTube, LINE, Web ads). Supports platform-specific presets, reference image search, and copy text generation. Use when creating social media posts, ads, or promotional materials.

Generate elegant cover images for articles with multiple style options.

Manage BAP (Bitcoin Attestation Protocol) identity files using bap-cli. This skill should be used when users need to create, decrypt, list, or extract BAP identity backups, work with .bep encrypted files, or generate test fixtures for Playwright tests involving BAP identities.

Specialized agent for BarqNet backend development. Focuses on Go backend API development, PostgreSQL database management, authentication systems, JWT tokens, OpenVPN integration, and production-ready backend architecture. Use this skill when working on server-side code, API endpoints, database migrations, or backend infrastructure.

You are an expert in barrel file generation and TypeScript/React project organization using barrel-craft. You excel at creating clean, maintainable import structures and automated barrel file generati

Use when starting a fine-tuning project to determine if fine-tuning is needed, or when evaluating whether a base model meets quality thresholds for a specific domain task

Base UI reference and workflows for @base-ui/react (unstyled, accessible React components, composition utilities, and form helpers). Use when implementing Base UI components, portals, styling/state hooks, render-prop composition, eventDetails customization, animations, forms/validation, TypeScript typing, CSP/RTL utilities, or checking Base UI docs, issues, or releases.

Update an existing BaseProject installation by syncing skills, docs, and AGENT.md from the latest upstream. Use when you want to pull the newest BaseProject templates, skills, and guides into your project.

Write robust, maintainable bash scripts with proper error handling.

Testing frameworks and patterns for shell scripts, focusing on shunit2 and shellspec.

Proper usage of Bash and file operation tools. Use this skill when executing shell commands, writing files, or when tempted to use echo/cat/heredoc to pipe content to files. Prevents permission circumvention patterns like piping multiline content through echo instead of using Write tool. Covers Bash tool, Write tool, Edit tool, and Read tool best practices.

You are an expert in defensive Bash scripting for production environments. Create safe, portable, and testable shell scripts following modern best practices.

Use when getting started with llmemory document storage and search - covers installation, initialization, adding documents, vector search, hybrid search, semantic search, BM25 full-text search, document management, and building RAG systems with multi-tenant support

This skill should be used when setting up, managing, or troubleshooting Basilica GPU miner operations on Bittensor Subnet 39 (mainnet) or 387 (testnet). Use it for GPU provider tasks including SSH configuration, validator authentication setup, node registration, performance monitoring, uptime optimization, and resolving common issues like SSH access problems, validator discovery failures, or GPU validation errors. Critical for miners struggling with SSH key deployment to GPU nodes or validator connectivity.

Bash Automated Testing System (BATS) for TDD-style testing of shell scripts. Use when: (1) Writing unit or integration tests for Bash scripts, (2) Testing CLI tools or shell functions, (3) Setting up test infrastructure with setup/teardown hooks, (4) Mocking external commands (curl, git, docker), (5) Generating JUnit reports for CI/CD, (6) Debugging test failures or flaky tests, (7) Implementing test-driven development for shell scripts.

Use when making predictions or judgments under uncertainty and need to explicitly update beliefs with new evidence. Invoke when forecasting outcomes, evaluating probabilities, testing hypotheses, calibrating confidence, assessing risks with uncertain data, or avoiding overconfidence bias. Use when user mentions priors, likelihoods, Bayes theorem, probability updates, forecasting, calibration, or belief revision.

Use when performing Bayesian statistical analysis, building probabilistic models, or when the task involves prior specification, posterior inference, or predictive checks.

DEPRECATED - Use domain-specific skills instead. Routes to bazinga-db-core, bazinga-db-workflow, bazinga-db-agents, or bazinga-db-context.

Bitcoin Cash (BCH) API implementation rules. Critical pattern for embedding Bitcoin struct and overriding BCH-specific methods. Use when working on BCH-related code in internal/infrastructure/api/btc/bch/.

Expert for Business Continuity Management (BCM) with deep knowledge of ISO 22301, ISO 22313, and integration with ISO 27001. Automatically activated when user asks about business continuity, disaster recovery, crisis management, emergency planning, BC plans, BC exercises, or BCM compliance.