# Radian

> A fast, efficient coding agent in one binary for development pipelines

- Website: https://getrad.dev
- Category: AI coding assistants & app builders
- Launched on RankRoot: 2026-10-25
- Visitors sent by RankRoot: 0
- Show HN discussion: https://news.ycombinator.com/item?id=50233447

## About

Radian is a coding agent packaged as a single Rust binary that operates from a full-screen terminal interface or headless shell commands. It includes arc, an orchestration system that turns requests into plans, runs tasks using separate worker processes, and evaluates them against a verification gate. Sessions are stored as individual files, enabling users to resume, fork, and export their work.

## Who it's for

Developers looking for a fast coding agent and task orchestration tool that integrates into development pipelines.

## Use cases

- Summarizing project files and codebases
- Running automated coding tasks via headless shell commands
- Planning and task orchestration with git worktrees and branch verification

## Features

- Runs as a single Rust binary with no runtime startup overhead
- Full-screen terminal interface (TUI) with built-in file and shell tools
- Headless command mode that outputs execution steps as JSON lines
- Arc orchestration system for managing plans, tasks, verification gates, and workers
- Session management supporting resume, fork, search, export, and attach

## FAQ

### What is Radian?

Radian is a fast, efficient coding agent distributed as a single Rust binary that fits into development pipelines and can be driven from a terminal interface or headless shell commands.

### How do you install Radian?

You can install Radian using Homebrew with 'brew install hisea/tap/radian', from a release tarball, or from source using Cargo with 'cargo install --git https://github.com/hisea/radian radian-tui'.

### How does Radian manage model credentials?

Radian runs a login wizard via 'radian login' that checks your key with a read-only request and saves it in '~/.radian/credentials/auth.json', or you can store the key in an environment variable like OPENAI_API_KEY.

### What is Radian arc?

Arc is built into the Radian binary to turn requests into repository tasks, run each task as a separate headless worker, and merge only the code that passes a fixed verification gate.


Source: https://getrankroot.com/launches/radian. Product facts come from the maker or the product's own website.