mastra-ai/mastra ? reverse-engineered prompt

Build me a framework for creating AI-powered applications and agents using TypeScript. It should be a comprehensive, production-ready solution that works for both frontend and backend development.

I want it to be able to connect to lots of different LLM providers like OpenAI, Anthropic, and Gemini through a single, standard interface. It should support building autonomous agents that can reason and use tools to complete tasks. It also needs a way to create more structured, multi-step workflows where I can control the exact execution flow and even pause a process to wait for human input or approval.

Make sure to include features for context management, like conversation history and long-term memory for the agents. It should integrate easily with modern frameworks like React and Next.js. Finally, include built-in tools for observability and evaluations so I can monitor, test, and improve the AI models over time. Please base this on the Mastra project.