LangChain Launches Open-SWE: Open-Source Async Coding Agent With Slack, Linear, and PR Automation — 7,819 Stars

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LangChain released Open-SWE on March 17–21, 2026 — an open-source asynchronous coding agent built on LangGraph that analyzes codebases, plans implementation, writes code, runs tests, and opens PRs autonomously. It integrates directly with GitHub, Slack (mention @openswe in any thread), and Linear (comment @openswe on any issue), giving teams the same internal agent architecture that companies like Cognition and Devin built privately. Fully open-source, forkable, and designed for self-hosted deployment with cloud sandboxes and subagent orchestration.