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Agent Framework vs Agent Harness: What I Would Build On in 2026

Every agent you ship sits on one of two routes. On the framework route, you build inside someone else's runtime: LangGraph, Mastra, an SDK agent class. On the harness route, the runtime is yours: a loop you wrote, tools you registered, limits you set. I have shipped both, including a 200-line TypeS…

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  1. 2026-11-13 04:30 · DEV Community — AI
    Agent Framework vs Agent Harness: What I Would Build On in 2026

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