by r3bl-org
TUI framework and developer productivity apps in Rust 🦀
# Add to your Claude Code skills
git clone https://github.com/r3bl-org/r3bl-open-coreGuides for using mcp servers skills like r3bl-open-core.
Last scanned: 8/20/2026
{
"issues": [],
"status": "PASSED",
"scannedAt": "2026-08-20T04:35:26.843Z",
"npmAuditRan": true,
"pipAuditRan": true,
"promptInjectionRan": true
}r3bl-open-core is an open-source mcp servers skill for AI coding assistants such as Claude Code, Codex CLI, and ChatGPT, built by r3bl-org. TUI framework and developer productivity apps in Rust 🦀. It has 478 GitHub stars.
Yes. r3bl-open-core passed SkillsLLM's automated security scan — a dependency vulnerability audit plus prompt-injection heuristics — with no high-severity issues. You can read the full report in the Security Report section on this page.
Clone the repository with "git clone https://github.com/r3bl-org/r3bl-open-core" and add it to your Claude Code skills directory (see the Installation section above).
r3bl-open-core is primarily written in Rust. It is open-source under r3bl-org on GitHub, so you can review or fork the full source.
Yes. SkillsLLM lists many other MCP Servers skills you can browse and compare side by side. Open the MCP Servers category from the badge at the top of this page, or use the Related Skills and comparison links further down to weigh r3bl-open-core against similar tools.
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⚠️ Third-Party Software Notice
This skill is third-party open-source software developed and hosted independently on GitHub. SkillsLLM is an informational directory and does not control or maintain the underlying repository.
Any security checks, ratings, or warnings displayed by SkillsLLM are automated and limited in scope. They do not constitute a security certification or guarantee that the software is safe, error-free, or free from malicious code, vulnerabilities, compromised dependencies, or prompt-injection risks.
Review the source code, permissions, dependencies, and configuration before installing or running any third-party skill. Use is at your own risk. To the maximum extent permitted by applicable law, SkillsLLM is not liable for losses arising from third-party software.
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Table of contents:
rust-toolchain-update.fish - Smart Validated Toolchain Updatesrust-toolchain-sync-to-toml.fish - Sync to Existing Configrust-toolchain-validate.fish - Unified Toolchain Validationremove_toolchains.sh - Testing UtilityAfter leaving Google in 2021, I (Nazmul Idris) embarked on a journey to create infrastructure for modern, powerful, async CLI and TUI experiences built from the ground up in Rust.
The core architectural innovation: a purely async, immediate mode reactive UI (every state
change triggers a render from scratch) where nothing blocks the main thread - unlike
traditional approaches using platform-specific blocking operations like POSIX
readline() on Linux/macOS or
Windows ReadConsole().
R3BL TUI is fundamentally different from vim,
neovim, and ratatui through its immediate
mode reactive UI with clean separation between rendering and state mutation, and purely
async nature.
This fully async, responsive framework works seamlessly across Linux, macOS, and Windows. It's optimized for use over SSH connections by painting only diffs, and handles complex concurrent operations with low latency while ensuring no thread blocking.
I initially tried Node.js with ink, but encountered fundamental limitations:
Our framework supports the full spectrum from CLI to hybrid TUI to full TUI experiences with deep system integration.
Key Innovation: "Applets" - A revolutionary state management system that allows processes to persist state across their lifecycle and share it with other instances or processes. And the underlying systems level infrastructure mechanisms that make this possible.
Async Readline: Unlike POSIX readline which is single-threaded and blocking, our implementation is fully async, interruptable, and non-blocking.
Choose API: Single-shot user interactions that enter raw mode without taking over the screen or disrupting the terminal's back buffer.
Full TUI: Complete raw mode with alternate screen support, fully async and non-destructive.
All components are end-to-end testable using our:
InputDevice and OutputDevice types for stdin, stdout, and stderr.PTY infrastructure.VT-100 parser / generator infrastructure.CSS-like styling with JSX-inspired declarative layoutsR3BL TUI brings the ergonomics of modern web development (React, flexbox, CSS) to
terminal applications in Rust, creating a new paradigm for command-line productivity
tools.
We are building command line apps with rich text user interfaces (TUI). We want to lean into the terminal as a place of productivity, and build all kinds of delightful, ergonomic, and useful experiences for it.