Safari 27 supports JSPI, a magic WebAssembly capability for sync native code to suspend on an async 𝙿𝚛𝚘𝚖𝚒𝚜𝚎.

On https://t.co/3Z4NESzNKd, libfx uses the built-in browser 𝚏𝚎𝚝𝚌𝚑 stack to make API calls.

As more code goes native, I expect WebAssembly to play a huge role https://t.co/AzhTVut0gM

fx - Tiny, open, native coding agent

Source: https://fx.sh/ v0.0.10(notes)6.17mibstatus:experimentaluse at your own risk, we will be making frequent changes

This demo runs the full fx CLI as WebAssembly compiled with the Zig toolchain. Networking is delegated to browserfetch, and every SDK aspect is configurable in thedocs.

fx is a coding agent harness and CLI written in Zig, optimized for research and embeddability as part of larger systems.

It focuses on minimalism and performance across the board, from system prompt design to its tools, feature set, and 6.17 MiB binary.

Its output is closer to a Unix shell than an IDE in the terminal.

It is open source (Apache-2.0), model-agnostic, and suitable for both local and cloud inference.

Tiny native binary

Install one binary for your terminal, CI, or agent sandbox.

Fast startup

Start an interactive session or run a single request withfx ask. No background service is required.

WebAssembly support

Run the agent or terminal in the browser withlibfx. Your application controls storage, tools, and network access.

Shell-like UI and ergonomics

fx preserves scroll history and keeps tool activity in the conversation. Open the full transcript when you need more detail.

Context efficient

Concise tool schemas keep the context small. Skill instructions and MCP tool schemas load when needed.

Embeddable and extensible

Embed the core withlibfx, add your own tools, and connect skills or MCP servers.