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Show HN: Mycelium – AI agent plugin guiding you from purpose to market

Mycelium is an open-source Claude Code plugin that ensures AI agents perform discovery and weigh evidence before writing code. It asks four critical questions (problem, target user, riskiest assumption, smallest test) to prevent building unnecessary features, making agents earn the right to start building. Designed for solo developers and small teams building software, courses, AI tools, and services.

SourceHacker News AIAuthor: haabe
Show HN: Mycelium – AI agent plugin guiding you from purpose to market
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Key points and analysis

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Key points

  • Mycelium forces agents to answer four questions (problem, target user, riskiest assumption, smallest test) before writing any code.
  • It is open-source and uses a scale-and-diamond framework for decision-making, adapting to project size.
  • The plugin is not for triage-lane work or pure execution; it focuses on deciding what to build.
  • Tested on real projects, Mycelium has been refined through dogfooding and external feedback.

Highlights and analysis are generated automatically and may contain errors. Check the original source.

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