http://fx.sh 0.0.7:

• hugely improved MCP support, eval’d with top MCPs like @context7ai, @datadoghq, @mongodb, @linear, @notionhq, @supabase, @neondatabase, @stagehanddev, @usekernel…

• more minimalist: fewer tools and improved shell execution. One of the trickiest things about CLI agents is that running commands is actually not that simple.

e.g: commands might hang or run for very long, their output needs to be monitorable by the agent, they might produce huge amounts of output, or none.

This is an area where 𝚏𝚡 really shines and will continue to get better.

fx - Tiny, open, native coding agent

Source: https://fx.sh/ v0.0.7(notes)6.19mibstatus: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.

fxis 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 6.19mib binary.

For end users, its CLI output style and form factor aims to be closer to a Unix shell than a heavy “IDE in the terminal” TUI.

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

Tiny ~6mb binary

Designed for instant installation and embedding in resource constrained environments and agent sandboxes.

Instant time to prompt

fx cold starts in10µsand does no unnecessary work or I/O prior to accepting user input, making it ideal for programmatic use.

Wasm support

Optimal fx.wasm builds produced by the Zig toolchain, which further reduce fx’s size, making the network stack pluggable.

Minimal memory footprint

fx contributes single-digit megabytes of memory baseline, allowing you to pack many instances in one machine.

Shell-like UI and ergonomics

fx preserves scroll history by default, produces minimal output, and makes sparing use of complex TUI or paints

Context efficient

Minimal system prompt and tools, to save on token costs and to yield optimal time-to-first-token performance (TTFT).

Embeddable and extensible

Small core, extended via skills, plugins, MCPs, with a Unix-like philosophy to extensibility.

Pranit (@fazxes): fx v0.0.7

MCP now feels native to fx. • Added 𝚏𝚡 𝚖𝚌𝚙 commands • Project-level MCP configuration • MCP management from the CLI • Better compatibility with existing servers • Cleaner transcripts & live turn feedback • Steer active turns with Ctrl+Enter • 8 fewer tools