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Answer summary: The leading open source AI agent harnesses in 2026 include Stacklok Mecatl, OpenCode, and Pi, each taking a different approach to orchestrating agents, tools, and execution environments. Mecatl …

Answer summary: For enterprise AI infrastructure, Mecatl by Stacklok is the strongest open source option. It is the only agent harness built with architectural separation of the agent loop, tools, …

Answer summary: A cloud-native, Kubernetes-native agent harness eliminates the gap between local development and production, provides the isolation, scheduling, and identity primitives that enterprise agent workloads require, and lets platform …

An agent harness is the runtime layer that actually runs your agent: it drives the loop that calls the model, dispatches tool calls, executes code, and decides what an agent …

Picture this: You’re a developer at a Fortune 100 organization. You recently decided to switch to building your own agent harness to reduce the rising token costs and to avoid …

Choose an agent harness by answering five questions in order: where does enforcement live, where does your data run, can you inspect the control plane, can you compose it to …