Everyone is discussing what a harness is. Nobody shows you how to build one. And everyone can.
So, I built my own Claude Code: t.co/sHXZ5g2YDL
It's called Mini Harness: about 1,200 lines of Python.
Other minimal harnesses exist, but none has /goal mode, permissions + auto mode, skills and MCP servers. I wanted a fully working one to explain how a harness is built, down to Anthropic's server-side compaction.
Surprisingly, it became the top harness on Claude Haiku.
How it works: 🧵
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Mini Harness: a 1,200-line Python Claude Code clone
Paweł Huryn built Mini Harness, a 1,200-line Python harness with /goal mode, permissions, auto mode, skills, and MCP servers. It became the top harness on Claude Haiku.
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