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DeepSeek Harness vs. xAgent: Choosing an Agent Harness Architecture

· 8 min read

DeepSeek Harness treats the Agent runtime as a composable plugin tree. xAgent starts with a different question: when a task has been running for hours, called Tools, waited for approval, and survived a service restart, who owns each piece of state?

That question sends the two architectures in different directions.

Both sit above the model API and handle Sessions, context, Tools, and execution. Both qualify as full Agent Harnesses. DeepSeek concentrates on making the runtime replaceable and recomposable. xAgent concentrates on keeping long-running work coherent. A feature checklist tends to hide that distinction rather than explain it.