@rauchg: http://fx.sh can now orchestrate subagents with different models & reasoning efforts. e.g: Fable planning and Grok exec…

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coding-agent subagent-orchestration open-source zig-toolchain model-agnostic experimental cli-tool

Summary

fx is an open-source, model-agnostic coding agent tool that allows orchestration of subagents with different models and reasoning efforts, written in Zig for performance and embeddability.

http://fx.sh can now orchestrate subagents with different models & reasoning efforts. e.g: Fable planning and Grok executing. Fable is a genius, Grok is a fast workhorse. ① Simple. 𝙰𝙶𝙴𝙽𝚃𝚂.𝚖𝚍 or your prompt can indicate this preference. ② Steer as you please. It’s extremely enjoyable to use. You just talk to the agent and interrupt at will. Worth noting this works with any model, any gateway. No fancy server-side routing. Just harnessing (no pun intended) the model’s intelligence and ability to orchestrate.
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http://fx.sh can now orchestrate subagents with different models & reasoning efforts.

e.g: Fable planning and Grok executing. Fable is a genius, Grok is a fast workhorse.

① Simple. 𝙰𝙶𝙴𝙽𝚃𝚂.𝚖𝚍 or your prompt can indicate this preference.

② Steer as you please. It’s extremely enjoyable to use. You just talk to the agent and interrupt at will.

Worth noting this works with any model, any gateway. No fancy server-side routing. Just harnessing (no pun intended) the model’s intelligence and ability to orchestrate.

fx - Tiny, open, native coding agent

Source: https://fx.sh/ v0.0.9(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.

Pranit (@fazxes): fx v0.0.9

Use a frontier model to steer, then hand implementation to a fast workhorse.

• Give each subagent its own model and reasoning effort • Subagents keep working while you steer • Send feedback to subagents mid-task • Switch models with Ctrl+P without losing your

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