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I Wanted a Streaming LangChain Agent. The Agent SDK Already Had the Hard Parts.

This story is from 2026-09-04. It is preserved in the archive; the latest stories are on the live feed.

Subhead: Tokens, tool calls, reconnects, and crash recovery — one durable actor shape instead of four subsystems. Every streaming agent demo ends at the same cliff: the model streams a pretty answer, and then real life shows up. A user asks a follow-up. Then another one before the first answer fini…

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  1. 2026-09-04 19:38 · DEV Community — AI
    I Wanted a Streaming LangChain Agent. The Agent SDK Already Had the Hard Parts.

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