google/adk-js ? reverse-engineered prompt

Build me a TypeScript toolkit for making AI agents that feels flexible and easy to use in real projects.

I want a core library for defining agents, giving them instructions, attaching tools, and letting them work in simple or multi agent flows. It should run in Node and the browser, support modern TypeScript with strong typing, and validate tool inputs cleanly. Include a few useful built in tools like web search and URL context, plus a way to plug in custom functions and connect to remote agents when needed.

Also add a small developer experience around it, with a command line tool and a local web UI for testing agents, running them, and debugging tool calls. Please make it so someone can create a basic agent quickly, then grow it into more complex workflows later. If anything about the current best practices or SDK setup has changed, look up the latest docs online before you start.