AsyncSubAgent

Specification for an async subagent running on a remote Agent Protocol server.

Async subagents connect to any Agent Protocol-compliant server via the LangGraph SDK. They run as background tasks that the main agent can monitor and update.

Compatible with LangGraph Platform (managed) and self-hosted servers. Authentication for LangGraph Platform is handled automatically by the SDK via environment variables (LANGGRAPH_API_KEY, LANGSMITH_API_KEY, or LANGCHAIN_API_KEY). For self-hosted servers, pass custom auth via headers.