Backend

Manages connections to Logseq graphs via HTTP API, CLI, or MCP Server. Auto-invokes when users mention connecting to Logseq, API tokens, graph paths, connection issues, or backend configuration. Handles backend detection, environment setup, and connectivity troubleshooting.

Backend development - APIs, authentication, business logic

When creating vector artwork, illustrations, or SVG graphics for creative expression - provides iterative drawing workflow with visual feedback using render-svg tool

Comprehensive guide for the Echo web framework. Use when building scalable, high-performance web applications and REST APIs in Go with features like flexible routing, middleware support, request/response binding, static file serving, and template rendering. Applies to installing Echo, defining routes, implementing middleware, handling requests/responses, and building web services.

Model Context Protocol (MCP) server implementation specialist for Claude Desktop integration. Handles TypeScript/Node.js server scaffolding, endpoint creation, telemetry setup, npx distribution, and comprehensive documentation. Follows MCP specification and best practices for production-grade server deployment.

Bun runtime and toolkit for JavaScript/TypeScript. Use for package management, running scripts, testing, and bundling. Replaces npm, yarn, pnpm, and node.

Configure CNF networking components including netkit BPF-programmable network devices, tcx (Traffic Control eXpress for kernel 6.6+), virtual interfaces, network namespaces, routing, and eBPF program attachment. Use when setting up network topology for eBPF-based CNFs or testing packet processing pipelines.

Guardrails to keep the pipeline pure: specs + SEA + generators only.

TypeScript/Playwright Test + Generator/Healer Agents活用によるE2Eテスト作成パターンガイド。E2Eテスト実装時・data-testid属性設計時・Blazor Server SignalR対応時に使用。Phase B2で確立した93.3%効率化パターン + Phase B2-F2でTypeScript移行完了。

Improve code quality, reduce technical debt, restructure for maintainability

Use this skill to take a user's infrastructure request (e.g., "deploy a new web server") and create a complete Terraform (HCL) file and a corresponding execution plan. This skill ONLY plans; it NEVER applies.

Build backend AI with Vercel AI SDK v5/v6. Covers v6 beta (Agent abstraction, tool approval, reranking), v4→v5 migration (breaking changes), latest models (GPT-5/5.1, Claude 4.x, Gemini 2.5), Workers startup fix, and 12 error solutions (AI_APICallError, AI_NoObjectGeneratedError, streamText silent errors). Use when: implementing AI SDK v5/v6, migrating v4→v5, troubleshooting errors, fixing Workers startup issues, or updating to latest models.

Build production-grade FastAPI backends with SQLModel, Pydantic, and JWT authentication. Use this skill when building REST APIs, integrating with Neon PostgreSQL, implementing Better Auth JWT verification, or creating CRUD endpoints. Includes patterns for audit logging, worker/agent parity, and OpenAPI documentation.

Build Shopify applications, extensions, and themes using GraphQL/REST APIs, Shopify CLI, Polaris UI components, and Liquid templating. Capabilities include app development with OAuth authentication, checkout UI extensions for customizing checkout flow, admin UI extensions for dashboard integration, POS extensions for retail, theme development with Liquid, webhook management, billing API integration, product/order/customer management. Use when building Shopify apps, implementing checkout customizations, creating admin interfaces, developing themes, integrating payment processing, managing store data via APIs, or extending Shopify functionality. | Sử dụng khi: Shopify, cửa hàng online, thương mại điện tử, Liquid.

Fast, persistent, and token-optimized browser automation using Playwright. Supports navigation, clicking, typing, screenshots, batch execution, and more. Use when working with web pages, browser automation, or when the user mentions browsing, clicking, or web scraping.

Use when working on worker implementation, ServiceOrchestrator patterns, WorkerAPIBase, operation dispatch, progress tracking, cancellation, backend-to-worker communication, or adding new worker types.

This skill should be used for Python idioms, type hints, async/await, pytest, Django, Flask, FastAPI, Python web frameworks, pandas, data processing

Production error patterns with thiserror and anyhow, including error classification, HTTP/gRPC protocol mappings, context chains, retry logic, and testing. Use when designing error types for libraries or applications, mapping errors to API responses, or implementing retry mechanisms.

Guide for building MCP (Model Context Protocol) servers that integrate external APIs/services with LLMs. Covers Python (FastMCP) and TypeScript (MCP SDK) implementations.

Test Spring Boot applications - MockMvc, TestContainers, test slices, integration testing