I built this because I kept trying to use Claude Agent SDK, Codex, and OpenCode programmatically, and they were too "heavy" and uncustomizable for that. I wanted a TypeScript library I could import into my own app and build agents on top of. OpenHarness is built on Vercel's AI SDK 5, so it works with any model the SDK supports. The main things it gives you: loading agent instructions from AGENTS.md files, MCP server connections for tools, subagents (agents delegating to child agents), agent skills, tool approval prompts, and auto-compaction for long conversations. There's a CLI example and a Next.js chat interface in the repo if you want to try it out. Still early -- feedback on the API and what's missing would be useful.
Eventually, there will be sets of tools for various platforms, e.g., filesystem tools for Node.js and Bun, and a set of tools specifically for building agents that use certain sandbox providers.
Fair question! ADK is a great framework for building agentic systems. OpenHarness is meant to be a set of higher-level primitives that can be used to quickly run more general and capable agents, and can easily work with existing AGENTS.md or agent skills standards. Basically, if you automated a task with Claude Code, and now you want to be able to *easily* run it programmatically. Or if you want to integrate an OpenCode-like agent into your application. OpenHarness is obviously new, but it also doesn't reinvent the wheel - it's built on top of Vercel's AI SDK!
Claude Code et al. are amazing, but they are not that great to build on top of them. That's why I created OpenHarness: a code-first, composable, and configurable SDK for building powerful, capable AI agents deeply embedded in existing applications.
Sutro | Senior Full-Stack Engineer | REMOTE | Full time
At Sutro, we're building the next generation AI-native no-code platform. Our code base is mostly written in TypeScript, with React (Native) for the frontend, with a particular focus on complex agentic workflows and many patterns from the fields of compilers and the theory of software languages.
We are looking for an experienced full-stack engineer with experience in architecting agentic workflows, building tasteful UIs, and knowledge in the field of compilers and software architecture theory.
Our primary location is Oakland, CA, and as such, our core working hours with everyone online are 8 am-11 am California time. Feel free to hit me up with questions!
I find it weird that the only sample application built with it is the old Wunderlist. Wunderlist 2 - which was released a few weeks ago - was developed native for each platform.
Looks very promising. I think there is still no good tool to manage all your links correctly. However, I have some ideas for you:
- Sharing lists (so that they show up under your list) with teams
- Mobile integration if this is possible
That is exactly what annoys me when looking at the website of a new framework. Often you are completely impressed by how simple it is to set up a blog but while building a larger application you realize that it is not suited for your project.
They have good and well written articles that cover local, national and international subjects and they have a nice website and a very good mobile website. And their office is just next to ours :) Nice to see them on the yc frontpage :)
I thought exactly the same way. But I really like the new Ubuntu, gotta give it a try on my pc at home.
I think with all the possibilities you have now on the web, it is a nice thing to have a light weight operating system. There is not much native software that I regularly use, most things work in my browser.