Plain: Full-Stack Python Framework Designed for Both Humans and AI Agents

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Plain, an open-source full-stack Python web framework designed to be equally usable by human developers and AI agents, hit 92 points and 51 comments on Hacker News. The framework prioritizes agent-friendly interfaces including structured tool use, deterministic file layouts, and machine-readable error messages alongside traditional developer ergonomics. It represents an emerging pattern: frameworks being designed agent-first rather than retrofitting AI capabilities onto human-first tools.