Retry and Fallback Paths

APIs fail.

The Retry Policy

LangGraph nodes can have retry policies attached.

• 503 Service Unavailable -> Wait 1s, Retry.
• 400 Bad Request -> Do NOT Retry. Fail immediately.

The Fallback Edge

If a tool fails permanently:

• Don't crash.
• Route to a Fallback Node.
  • Example: Primary Stock API failed? Rout to Backup Stock API.
  • Example: Calculator Tool failed? Ask LLM to estimate (with a warning).

This resilience is defined in the graph edges, keeping your business logic clean.