LangGraph 1.2.0 Alpha Ships Deep Agents — May 1 Release Adds Subagent Planning, Async Background Tasks, and Multimodal File Access

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LangGraph released version 1.2.0a5 on May 1, 2026, introducing Deep Agents that enable planning, subagent delegation, and file system access for complex multi-step tasks. Key additions include non-blocking background tasks for async subagents, read_file support for PDFs, audio, and video files, type-safe streaming v2 with unified StreamPart output, and dynamic push-task timeouts.