Interceptors

Interceptors let you add cross-cutting behavior before and after SDK operations such as starting a Workflow, executing an Activity, or handling a Signal. They work like middleware: each interceptor wraps the next, forming a chain that executes around the underlying operation.

Common use cases:

• Observability (logging, metrics, tracing)
• Authorization and authentication checks
• Header manipulation (propagating metadata)
• Input/output validation

Implementing Interceptors

Here are SDK-specific guides:

• Python
• TypeScript