langgraph-typescript-quickstart

LangGraph TypeScript quickstart Follow the live docs — do not invent an alternate API from memory: https://docs.langchain.com/oss/javascript/langgraph/quickstart Fetch that page (Docs MCP or HTTP) and implement what it shows (calculator / math agent with the Graph API). Prefer the Graph API path over the Functional API unless the user asks otherwise. Skip graph visualization. Local setup constraints Apply these on top of the quickstart (they keep setup minimal and model-agnostic): Ask which provider/model to use. Showcase that LangGraph works with any LangChain chat model. Suggested prompt: Which model should this agent use? Pass a provider:model string — e.g. openai:gpt-5.5 , anthropic:claude-sonnet-5 , google-genai:gemini-2.5-flash-lite . Default if you're unsure: anthropic:claude-sonnet-5 . The docs often hardcode Anthropic — replace with initChatModel("") (or equivalent) using their choice. If using Claude Sonnet 5+, omit temperature / top_p / top_k (unsupported). Create a new directory (e.g. langgraph-agent/ ) and do all work there — do not pollute the open project. Show more Installs 929 Repository langchain-ai/la…n-skills GitHub Stars 1.1K First Seen Jul 23, 2026 Security Audits Gen Agent Trust Hub Pass Socket Pass Snyk Warn