LangChain DeepAgents Harness Profiles deliver 10–20pt tau2-bench gains via per-model system prompt and middleware overrides; harness is now a first-class versioned object.
deepagents ships ACP built-in: any interface (CLI, TUI, GUI, IDE) drives the same agent harness without lock-in. toad TUI and JetBrains IDE integration available on day one.
LangChain's coordinated release: deepagents-cli open-model profiles, Fleet multi-model sub-agent routing, LangGraph 1.2 alpha with node error handlers and live-update support.
LangChain DeepAgents deploy: a deepagents.toml config file covers model selection, sandboxing, multi-tenant auth, and a streaming frontend—agents in cloud in minutes.
DeepAgents middleware gains adoption with batteries-included defaults and full hook-based customisation, now running in production for manufacturing diagnostics.
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