# Plugins

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> Bundle interceptors, context propagators, data converters, and built-in definitions into reusable packages.

A Plugin bundles multiple extensibility primitives - interceptors, context propagators, data converters, and built-in Workflow/Activity/Nexus definitions - into a single reusable package. Plugins let platform teams and library authors ship ready-made functionality that application developers can adopt with a single registration call.

Common use cases:

- AI Agent SDKs (for example, OpenAI Agents, Pydantic AI, LangGraph)
- Observability packages (tracing, logging, metrics)
- Encryption or compliance middleware
- Shared infrastructure integrations (messaging, payments, LLM calls)

## Implementing Plugins

See the [Plugins guide](/develop/plugins-guide) for how to build and use plugins across all supported SDKs.