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Rubberduck

Rubberduck is a software design agent that keeps the human in charge of architectural decisions instead of silently generating an implementation. The product is useful for developers, tech leads and AI-assisted teams who want a structured design partner before handing work to a coding agent. Its positioning on Show HN emphasizes that the agent helps reason about software design while users make the decisions, which is a healthier workflow than letting an autonomous tool invent hidden assumptions. Rubberduck fits Smartoolbox as a code-assistant and AI-agent tool because it targets the planning layer where many vibe-coded projects go wrong. It is notable now because it has a fresh launch, reachable official site, visible pricing, and a specific design-assistance niche rather than generic chatbot copy.

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