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    3. MaxGfeller

    MaxGfeller

    MaxGfeller builds OpenHarness, an open-source TypeScript SDK for constructing composable AI agent harnesses. The project is MIT-licensed and hosted on GitHub, providing stateless primitives, middleware, and subagent hierarchies for developers building Claude Code-like products. OpenHarness is built on top of Vercel's AI SDK and supports any compatible model provider.

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    OpenHarness

    Open Source AI Agent SDK

    Agent HarnessAgent FrameworksAI Dev Libraries

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