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What Is an Agent Harness? The Layer That Makes AI Agents Actually Work

calendar_today July 17, 2026 person Mike Ranellone domain comet-ml

If you’ve shipped an LLM-powered feature beyond a simple chat interface, you’ve already built parts of an agent harness. The retry logic around a failed tool call, the code assembling a system prompt at runtime — these are harness components. Most teams build these pieces incrementally as problems surface in production, which means the agent […] The post What Is an Agent Harness?

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