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AI Agents · Class

OutputGuardrail

LangChain streaming delivers live agent-run data while execution continues. It can show progress, tokens, custom data, and subgraph updates before the final result is ready.

Last updated

Since
v1.3 for the typed event-streaming API

Syntax

agent.stream(input, stream_mode=...)

In-depth API docs are only for subscribers: parameters, examples, common mistakes and interview practice.

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  • event streaming
  • agent progress
  • messages streaming
  • custom data streaming
  • subgraphs

Source: Streaming. Checked 2026-11-03.