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Harness² CLI: a general-purpose version of Harness² (google-research/harness2). Tune any coding agent's harness (CLAUDE.md/AGENTS.md, skills, subagents, hooks) on your own tasks, with your Claude or ChatGPT subscription or any model provider.
Harness² on Pi Durable: runs a task, tests harness changes on fresh copies, adopts the best, and learns lessons across tasks — model weights stay fixed.
Evidence-first document review with real LangGraph workflows, a custom Harness² adapter, durable human approval, and a transparent interactive walkthrough.