Relay is a working demo of the supervisor pattern taught in most agentic-AI courses: an orchestrator reads your task, decides which specialists it actually needs — including a Coder that writes and really runs Python, live, via Pyodide — then hands off until a final answer comes back.
Waiting for a task to route.
Pulls in relevant facts and context.
Works through logic, steps, trade-offs.
Writes Python, then really runs it.
Composes the final answer you see.
Each station is its own call to Claude. Coder is different: its code doesn't just get described, it's actually executed in your browser via Pyodide (real CPython compiled to WebAssembly) inside a Web Worker — real stdout, real stderr, real exit code, sandboxed, no server involved. First run boots the runtime, so it's slower than the rest.