Lenny's Newsletter · 12 October 2026

How Meta designed Muse: an AI agent people actually want to talk to | Alex Cornell (Design Director)

Lenny Rachitsky

Meta design director Alex Cornell discusses how his team built Muse, a consumer AI agent with thoughtful interface patterns—custom avatar, three-layer status display, personalized feeds—and shares concrete design decisions that make it feel like messaging rather than an AI app.

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Topics: AI (Horizontal) · Consumer

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