tl;dr: Earendil released Pi 1.0, a minimal, extensible agent harness/coding CLI that now adds Codemode (with MCP and non-LLM model support), virtual model extensions, deferred tool loading, Anthropic cache warming, mid-conversation system messages, and a full-screen TUI by default. Alongside it, they're shipping Pi Durable, an experimental MIT-licensed package for building long-running agentic applications beyond the terminal. Both are installable via shell script or npm.