Dify Review — Open-Source AI Workflow Platform With MCP, RAG, and Multi-Agent Orchestration

Dify is an open-source platform for building, deploying, and operating AI applications — combining visual workflow orchestration, RAG pipelines, agent execution, and MCP support in a single self-hostable package. 131K GitHub stars, $30M funding, 1M+ apps in production. Here's what it actually is, what's changed in 2026, and who should use it.