MCP Spec Assistant

Answers questions on LangChain and LangGraph: agents, models, tools, memory, streaming and Deep Agents, citing the exact file in the public docs of the GitHub repo langchain-ai/docs (MIT). Not an official LangChain product.

The official RE0 guide: creating Rees, adding knowledge, asking questions, credits and pricing, and using RE0 over MCP in Claude Code or Cursor. Ask in English or Chinese.

Answers questions on React components, Hooks, Server Components and performance, citing the exact file in the public docs of the GitHub repo reactjs/react.dev (CC BY 4.0). Not an official React product.

Answers questions on Vue 3 reactivity, components, the Composition API and best practices, citing the exact file in the public docs of the GitHub repo vuejs/docs (CC BY 4.0). Not an official Vue product.

Answers questions on Ruby on Rails: Active Record, migrations, routing, controllers, views and more, citing the exact file in the Rails Guides of the GitHub repo rails/rails (CC BY-SA 4.0). Not an official Rails product.

Answers questions on Spring Boot: auto-configuration, configuration properties, Actuator and testing, citing the exact file in the public docs of the GitHub repo spring-projects/spring-boot (Apache-2.0). Not an official Spring product.

Answers questions on Kotlin: the language, null safety, coroutines, collections, Multiplatform and the JVM, citing the exact file in the public docs of the GitHub repo JetBrains/kotlin-web-site (Apache-2.0). Not an official Kotlin product.

Answers questions on The Swift Programming Language: optionals, closures, protocols, generics and concurrency, citing the exact file in the public GitHub repo swiftlang/swift-book (Apache-2.0). Not an official Swift product.