Pieter Omvlee Announces Elyx: A Local-First Design Tool Built for Code and AI Agents

X postPieter OmvleeAnnouncement

Pieter Omvlee has unveiled Elyx, a local-first design tool powered by a human-readable design language. Elyx files live directly inside Git repositories alongside application code, enabling designers, developers, and AI agents to collaborate without proprietary lock-in or MCP servers.

Key points

  1. Elyx introduces a structured, human-readable, and AI-friendly file format (.elyx) stored in Git alongside source code.
  2. Omvlee notes that Elyx avoids the Model Context Protocol (MCP), opting for direct local file access by agents instead.
  3. The editor is a cross-platform application with a fast Metal- and GPU-accelerated native rendering stack, featuring design tokens, components, variants, and stacks.
  4. A dedicated CLI and agent skills allow automated tasks, such as scheduled checks for drift between design and code.
  5. The tool is currently accepting sign-ups for a private beta.

Why it matters

Mainstream interface design tools often lock design decisions behind proprietary cloud platforms and paid AI credits. By adopting a local-first, plain-text approach managed by version control, Elyx treats design assets like source code that can be read and edited by any LLM or developer tooling.

Analysis

The release addresses the growing divergence between fluid AI-assisted software development and static UI mockups. By removing intermediary layers like MCP servers in favour of standard files in a repository, Elyx aims to establish a shared source of truth between human designers, engineers, and automated agents.

Original post

Pieter Omvlee

@pieteromvlee · 15 September 2026

So excited to finally be able to share what we've been working on: Elyx, a new design tool for a new age. t.co/a3mLm0RFh5

196 likes7 replies45 bookmarks11.9k views

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More posts in the thread (1)
  1. @sworup_ku First of all: no MCP 😄. You don’t need it, no need for that clunky mechanism if you can just get the files directly
Selected replies (5)
  • @sworup_ku @pieteromvlee Can't wait to see how is it different from using MCPs in other tools!
  • @sheherenow_ @pieteromvlee omggg i can't wait to see this!!!
  • @RamanduLight @pieteromvlee The suspense is killing me...
  • @lexrodba @pieteromvlee Signing up asap
  • @usedarkroom @pieteromvlee Congratulations, Pieter!

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Summary generated by AI (Gemini 3.8 Flash, 27 September 2026). It may contain errors – the original source is authoritative.

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