[▲ Vercel Community](/) · [Categories](/categories) · [Latest](/latest) · [Top](/top) · [Live](/live) [Showcase](/c/showcase/41) # Library to build Claude Code-style agent harnesses with the AI SDK 50 views · 3 likes · 2 posts Max Gfeller (@maxgfeller) · 2026-03-25 · ♥ 2 Hey! Wanted to share OpenHarness: a code-first, composable SDK to build agent harnesses like Claude Code in no time, built with the AI SDK. It provides a set of composable primitives, like an agent, session, and a basic set of tools. The session handles turns, retries, hooks, context management, etc., and the agent class supports AGENTS.md, agent skills, MCP servers, subagents, etc. There are a few examples in the repo, including a Next.js full-stack application. I believe this is currently the easiest way to build a Claude Code-style app. Would love to get your feedback on this! Repo: https://github.com/MaxGfeller/open-harness Max BestCodes (@bestcodes) · 2026-03-31 · ♥ 1 Lots of stars! :eyes:  This is very interesting. I've been messing around with AI agents a lot recently, will have to check this out.
