fx (by Vercel)

fx is a compact, open-source coding agent designed for developers who prioritize speed and efficiency. Key features include: • Extremely small native binary (~6MB) • Instantaneous startup times • Low memory and context overhead • Support for local and cloud models • Highly extensible with skills, plugins, and MCPs Crafted in Zig, fx provides a minimal command-line interface that integrates seamlessly into existing workflows. Its design focuses on removing unnecessary friction, allowing developers to interact with code generation functionalities without heavy resource consumption. This makes it ideal for integrating into larger systems or using in resource-constrained environments. The tool’s shell-like UI and efficient context management mean it contributes minimal system overhead, preserving scroll history and reducing token costs. It's an excellent choice for engineering teams, researchers, and developers who require a flexible, high-performance coding agent that can be customized and embedded into their infrastructure.