Development

Use when you have a spec or requirements for a multi-step task, before touching code

Nest.js framework expert specializing in module architecture, dependency injection, middleware, guards, interceptors, testing with Jest/Supertest, TypeORM/Mongoose integration, and Passport.js authentication. Use PROACTIVELY for any Nest.js application issues including architecture decisions, testing strategies, performance optimization, or debugging complex dependency injection problems. If a specialized expert is a better fit, I will recommend switching and stop.

Create custom external web service APIs for Moodle LMS. Use when implementing web services for course management, user tracking, quiz operations, or custom plugin functionality. Covers parameter validation, database operations, error handling, service registration, and Moodle coding standards.

Comprehensive JavaScript reference covering 33+ essential concepts every developer should know. From fundamentals like primitives and closures to advanced patterns like async/await and functional programming. Use when explaining JS concepts, debugging JavaScript issues, or teaching JavaScript fundamentals.

Expert patterns for HubSpot CRM integration including OAuth authentication, CRM objects, associations, batch operations, webhooks, and custom objects. Covers Node.js and Python SDKs. Use when: hubspot, hubspot api, hubspot crm, hubspot integration, contacts api.

Pragmatic coding standards - concise, direct, no over-engineering, no unnecessary comments

Modern JavaScript/TypeScript development with Bun runtime. Covers package management, bundling, testing, and migration from Node.js. Use when working with Bun, optimizing JS/TS development speed, or migrating from Node.js to Bun.

Expert patterns for Azure Functions development including isolated worker model, Durable Functions orchestration, cold start optimization, and production patterns. Covers .NET, Python, and Node.js programming models. Use when: azure function, azure functions, durable functions, azure serverless, function app.

Specialized skill for building production-ready serverless applications on AWS. Covers Lambda functions, API Gateway, DynamoDB, SQS/SNS event-driven patterns, SAM/CDK deployment, and cold start optimization.

Every product will be AI-powered. The question is whether you'll build it right or ship a demo that falls apart in production. This skill covers LLM integration patterns, RAG architecture, prompt engineering that scales, AI UX that users trust, and cost optimization that doesn't bankrupt you. Use when: keywords, file_patterns, code_patterns.

Expert in Langfuse - the open-source LLM observability platform. Covers tracing, prompt management, evaluation, datasets, and integration with LangChain, LlamaIndex, and OpenAI. Essential for debugging, monitoring, and improving LLM applications in production. Use when: langfuse, llm observability, llm tracing, prompt management, llm evaluation.

When the user wants to create or update a README.md file for a project. Also use when the user says 'write readme,' 'create readme,' 'document this project,' 'project documentation,' or asks for help with README.md. This skill creates absurdly thorough documentation covering local setup, architecture, and deployment.

适用于 Filament Resource 的 Table 配置文件（如 `OrdersTable.php`、`UsersTable.php` 等）。

Filament/PHP代码格式化规则，包括链式调用换行、参数省略默认值、schema/components区分等。

Build and maintain MCPs in the decocms/mcps monorepo. Covers deco HTTP server pattern (withRuntime, createPrivateTool), tool definitions, app.json config, and the two MCP types: custom server vs official external server.

Build responsive deco CMS home widgets (MCP-App tiles). Covers the resizable tile grid (Size picker up to 4×5), observed pixel sizes, the golden rules for filling + scrolling inside a tile, ResizeObserver-based breakpoints, and how to register a widget (tool _meta.ui.resourceUri → resource → constants → vite entry → html).

Set up, check, stop, or delete a retalk relay server (retalk-server). Use when the user needs their OWN relay rather than an existing URL. Invoke as `relay setup`, `relay ping`, `relay stop`, or `relay delete`. Uses AskUserQuestion to pick the host (Local / Local+Cloudflare / Hugging Face / GCP) and gather settings.

Write clear technical documentation. Use when creating READMEs, API docs, or user guides. Covers documentation types and best practices.

Manage project context effectively. Use when onboarding, context switching, or maintaining project knowledge. Covers context capture and sharing.

Write TypeScript code following best practices. Use when developing TypeScript/JavaScript applications. Covers type safety, patterns, and tooling.

Write Python code following best practices. Use when developing Python applications. Covers type hints, async, and modern tooling.

Troubleshoot and fix bugs systematically. Use when errors occur, tests fail, or unexpected behavior is observed. Covers root cause analysis and debugging strategies.

Design clean, consistent APIs. Use when creating new endpoints, defining contracts, or improving API ergonomics. Covers REST, versioning, and error handling.

Bootstrap or align Webpack asset builds while preserving custom entries, manifest consumers, deployment paths and Umbrella framework integration.