Agents & Orchestration
6 Layer Harness Guide
A six-layer agent harness that keeps long autonomous runs stable and on track.
Published May 2026
Look inside
On March 31, 2026, Anthropic accidentally shipped Claude Code with its full TypeScript source code attached. Researchers found that the AI decision logic is roughly 1.6 percent of the codebase. The harness is the other 98.4 percent. The model is a small node inside a large system, and the harness is where the leverage is.
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