• An open, growing reference for building agent runtimes — concepts, tutorials, papers, tools — in one curated place.
• The map to start from if harness engineering is the rabbit hole you are heading down.

• THpostThe Harness Is Everything: What Cursor, Claude Code, and Perplexity Actually Builtx.com
• MErepoMeta-Harness: End-to-End Optimization of Model Harnessesyoonholee.com
• AGarticleA Guide to Which AI to Use in the Agentic EraEthan Mollick

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