How To Design In The Agent Era

Stephen Haney presents Paper, an AI-native design tool built by a 12-person team of designers and engineers. Unlike traditional design tools with custom rendering engines, Paper uses HTML and CSS as its rendering engine, making it inherently compatible with AI agents that understand web standards. This architectural choice results in faster execution, lower token spend, and higher accuracy when agents interact with designs.

The conversation covers Paper's technical advantages and design philosophy. Because Paper renders HTML/CSS natively, designers unknowingly create code-ready designs that agents can understand directly. The tool includes innovative features like customizable shader effects (created by studying physical paper's randomness), image generation libraries using multiple models simultaneously, and direct integration with code repositories through MCP servers. Stephen demonstrates how designers can extract colors, vectorize graphics, and export designs as React components or Tailwind CSS.

A major focus is identifying and avoiding "AI tells" — visual patterns that signal a design was generated without human refinement. Common tells include: excessive font weights (designers should pull back to regular or light weights), too many font sizes (consolidate to three), overuse of cards and widgets, unnecessary icons and decorative elements, side swoops of color, purple gradients, dark mode implementations, overly spaced all-caps headers, and numbered badges. Stephen argues these patterns don't inherently look bad but become problematic through repetition, making designs look generic and untrustworthy.

The discussion emphasizes that human design judgment remains irreplaceable. While models like Fable show improved taste and thoughtfulness, they cannot make high-level organizational decisions about what to build, which stakeholders to satisfy, or how to communicate value propositions. Models excel at tactical improvements (typography, spacing, contrast) but struggle with strategic design thinking. Stephen argues that exceptional design is the differentiator between great companies and average ones, citing that every successful company of the past 20 years has had exceptional design.

Paper's go-to-market strategy relied heavily on values alignment before the product existed. Stephen spent the first year building Twitter followers and podcast presence by authentically discussing design principles. This grassroots approach created a movement among designers who appreciated the team's genuine passion for design tooling. The company has achieved comparable adoption to Sketch (according to Ramp subscription data) within a highly competitive market dominated by Figma.

Stephen contrasts Paper with his previous company, Modules, which attempted designer-developer handoff but failed to achieve venture-scale business. He emphasizes learning to focus on "bottlenecks first" — identifying what's preventing growth and solving that rather than building comprehensive feature sets. At Paper's current stage, the bottleneck has shifted from awareness to missing features like comments and components, which will guide development priorities.

The conversation demonstrates Paper in action across multiple use cases: creating animated shader effects for YC branding and acceptances, generating brand illustrations with multi-model exploration, extracting color palettes, live editing websites captured via Chrome extension, and requesting agent iterations on designs. Real website reviews (Legion Health, SciTechs, Moretta) show how pulling back font weights, reducing font sizes to three maximum, and removing decorative elements dramatically improves professionalism and trustworthiness.

Stephen's team internally takes a measured approach to agents despite building tools for them. All code receives human review from multiple team members because design tool development requires precision and consistency. However, agents assist with marketing sites, videos, and non-critical features. Agu, Paper's brand designer, built the entire marketing website in one week using Paper and agents, demonstrating designer-agent collaboration at its best.