Pi is a deliberately minimal terminal coding agent — four tools, a unified multi-provider LLM API, and an extension system instead of a feature list. How its four-tool core, four run modes, tree sessions, and bring-your-own-model design differ from Claude Code, and the honest trade-offs of a harness you have to assemble yourself.
Pi
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Pi: The Agentic Coding Harness That Refuses to Have Opinions