Deep Agents TypeScript quickstart Follow the live docs — do not invent an alternate API from memory: https://docs.langchain.com/oss/javascript/deepagents/quickstart Fetch that page (Docs MCP or HTTP) and implement the research-agent shape it shows ( , research system prompt, invoke with a research question like “What is LangGraph?”). Requires Node 22+. Local setup constraints Apply these on top of the quickstart (they keep setup minimal and model-agnostic): 1. Ask which provider/model to use. Showcase that Deep Agents are model-agnostic. Suggested prompt: Which model should this agent use? Pa…