CLAURST

Agentic coding for builders who ship

Claurst is an open-source, multi-provider terminal coding agent built from the ground up in Rust. It started as a clean-room reimplementation of Claude Code's behavior (from spec) and has since evolved into an amazing TUI pair programmer with multi-provider support, a rich UI, plugin system, a companion named Rustle, chat forking, memory consolidation, and much more.

It's fast, it's memory-efficient, it's yours to run however you want, and there's no tracking or telemetry.

[!NOTE]
Recent Updates:

• /goal support: Try out /goal <objective> to see claurst keep working an objective, spanning multiple turns instead of stopping after one normal turn. [EXPERIMENTAL]

• Managed Agents Preview: Run /managed-agents to create a better agentic loop with a Manager-Executor relation and dramatically improved performance for fractions of the cost from running a larger model. Choose from 6 pre-built templates or build your own.[EXPERIMENTAL]

• Speech modes: Try /rocky and /caveman to hear the difference! /normal to go back.

Getting Started

Quick install (one-liner)

Linux / macOS:

curl -fsSL https://github.com/kuberwastaken/claurst/releases/latest/download/install.sh | bash

Windows (PowerShell):

irm https://github.com/kuberwastaken/claurst/releases/latest/download/install.ps1 | iex

This drops claurst into ~/.claurst/bin (or %USERPROFILE%\.claurst\bin on Windows) and adds it to your PATH automatically. Open a new terminal and run claurst.

To upgrade later, run:

claurst upgrade

Pin a specific version with --version 0.0.9 on either installer, or claurst upgrade --version 0.0.9.

Manual download

If you'd rather grab the binary yourself, the latest archives are on GitHub Releases:

Each archive contains a single claurst (or claurst.exe) binary. Extract it and put it on your PATH.

Build from source

git clone https://github.com/kuberwastaken/claurst.git
cd claurst/src-rust
cargo build --release --package claurst

# Binary is at target/release/claurst

Raspberry Pi / systems without ALSA (e.g. Debian Trixie, headless servers):

# Build without voice/microphone support — no libasound2-dev required
cargo build --release --package claurst --no-default-features

First run

# Set your API key (or use /connect inside Claurst to configure)
export ANTHROPIC_API_KEY=sk-ant-...

# Start Claurst
claurst

# Or run a one-shot headless query
claurst -p "explain this codebase"

Devcontainer setup

After cloning this repository, open it in VS Code and use Reopen in Container to start the development environment.

Prerequisites:

• Docker installed on your host machine: https://www.docker.com/products/docker-desktop/

GPG and SSH forwarding is enabled in the devcontainer, given you have it set up on your host machine. Follow this guide if you need help with that.

Devcontainer features

• Base image: rust:1-bullseye.
• Preinstalled build dependencies: gnupg2, libasound2-dev, libxdo-dev, and pkg-config.
• Devcontainer features enabled: common-utils (with vscode user uid/gid 1000 and Zsh install disabled), git, and docker-outside-of-docker (moby: false).
• Runs as vscode user by default.
• Persistent Cargo caches via named volumes for /usr/local/cargo/registry and /usr/local/cargo/git.
• Binds local .claurst into /home/vscode/.claurst for local settings/session history access.
• Sets GNUPGHOME=/home/vscode/.gnupg and prepends src-rust/target/debug and src-rust/target/release to PATH.
• Post-create setup creates and permissions .gnupg, and fixes ownership for /usr/local/cargo.
• VS Code setting terminal.integrated.inheritEnv is enabled.

Documentation

For more info on how to configure Claurst, head over to our docs.

PS: The original breakdown of the findings from Claude Code's source that started this project is on my blog - the full technical writeup of what was found, how the leak happened, and what it revealed.

Contributing

Claurst is built for the community, by the community and we'd love your help making it better.

Open an issue for bugs, ideas, or questions, or Raise a PR to fix bugs, add features, or improve documentation.

Important Notice

This repository does not hold a copy of the proprietary Claude Code TypeScript source code.
This is a clean-room Rust reimplementation of Claude Code's behavior.

The process was explicitly two-phase:

Specification spec/ — An AI agent analyzed the source and produced exhaustive behavioral specifications and improvements, deviated from the original: architecture, data flows, tool contracts, system designs. No source code was carried forward.

Implementation src-rust/ — A separate AI agent implemented from the spec alone, never referencing the original TypeScript. The output is idiomatic Rust that reproduces the behavior, not the expression.

This mirrors the legal precedent established by Phoenix Technologies v. IBM (1984) — clean-room engineering of the BIOS — and the principle from Baker v. Selden (1879) that copyright protects expression, not ideas or behavior.