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fx (by Vercel)

Vercel's tiny, open-source coding agent

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fx is Vercel's tiny, open-source coding agent built to get out of your way. Written in Zig and shipped as a ~6MB native binary, it starts almost instantly while keeping memory and context overhead low. Use it with local or cloud models, extend it with skills, plugins and MCPs, or embed it into your own agent infrastructure. Small by design, so the model gets more room to work.

PH · launched Aug 21, 2026 · 224 upvotes (top 61%) · 0 views

Niche: ai coding agents · 470 launches, 22 in the last 7 days ▼ -48% · Explore this niche →

Category and tags
  • Horizontal
  • Agent / copilot
  • Developer
  • AI-native
  • Hobby / open-source project
  • Developer Tools
  • Artificial Intelligence
  • GitHub

Visit website ↗ Source listing ↗

More like this: all 470 launches in ai coding agents →

Could you build this?

Partial The agent loop and MCP protocol are standard patterns, but implementing this from scratch in Zig as a zero-dependency ~6MB native binary requires low-level systems programming that AI assistants frequently struggle with due to Zig's rapid language churn.

What it would actually take: The stack requires native Zig utilizing low-level OS primitives for non-blocking I/O, subprocess execution, and custom streaming JSON/SSE parsers without heavy external runtimes. The hard parts are manual memory management, cross-platform terminal handling across POSIX and Windows, and binary size optimization without relying on established language ecosystems. This requires specialized expertise in Zig systems programming and native CLI architecture.

Competitors

Other products that read as similar to this one : 248 launches clear the similarity bar, closest 8 shown.

Attention rank: #163 of 249 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 290 days after the earliest competitor.

  • Open Agents · ph · 2026-04-14 · 161 upvotes · similarity 0.60
  • deepsec · ph · 2026-05-10 · 256 upvotes · similarity 0.49
  • fx0 · github · 2026-10-19 · 391 upvotes · similarity 0.44
  • CodeAF · ph · 2026-10-02 · 79 upvotes · similarity 0.44
  • Mini-coder · hn · 2026-03-02 · 6 upvotes · similarity 0.43
  • fx-ui · github · 2026-09-10 · 46 upvotes · similarity 0.43
  • 143.dev · hn · 2026-06-30 · 13 upvotes · similarity 0.42
  • SuperX Code · ph · 2026-09-20 · 2 upvotes · similarity 0.41

Related data

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