/ production
05 Production Harnesses & Capstone
Day 5. We dissect three real harnesses to see how they implement, at scale, everything you just built by hand, then you assemble your own and demo it.
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pi internals: the minimal-surface philosophypi
How pi (pi.dev) stays tiny: extensions, models.json, and a deliberately small surface. The proof that a real harness doesn't have to be enormous.
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Hermes internals: a research lab's harnessHERMES
Nous Research's Hermes as a contrast: a different set of design choices for the same problems of loop, tools, memory, and control.
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Claude Code internals: skills, hooks, MCP, sub-agentsCC
The reference production harness: permission modes, hooks, skills, MCP servers, and sub-agent types, mapped onto the layers you built.
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Evaluating a harness: how you know yours works
Beyond 'it ran': task success, recovery under failure, token efficiency, and safe-by-default behavior. How to actually measure a harness.
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The capstone: your own harnessSHIP
Assemble the loop, tools, context engine, durability, and orchestration into your own pi-style coding harness, and demo it live. Yours forever.