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Overview
A live ReAct agent on LangGraph. It calls OpenAI from the sandbox and can use a small set of tools for time, arithmetic, and echo.
Tools
getCurrentTime— current time in the sandboxcalculator— basic arithmeticecho— returns the input string (useful for wiring checks)
How it works
The LangGraph graph runs a tool-calling loop: the model decides whether to call a tool or answer. System prompt and tool definitions live under src/ so you can swap behavior without touching the preview harness.
Environment
OPENAI_API_KEY — entered in the preview UI, held in memory, and sent only to your sandbox session.