ClaudeCode (Open Source)

A high-performance, open-source AI coding agent written in Rust.

ClaudeCode is a terminal-native CLI agent designed to bring advanced LLM capabilities directly into your development workflow. Built for speed, safety, and efficiency, it provides an interactive agent shell, workspace-aware tools, and persistent session management. It is an independent open-source implementation inspired by Claude Code, not the official Anthropic product.

Star History

Related Projects

• Anthropic developer docs
• Anthropic
• Anthropic on X

Key Features

• Rust-powered: Built with Rust for memory safety, minimal binary size, and high execution speed.
• Agentic CLI: Interactive shell and one-shot prompt support for seamless terminal workflows.
• Model flexible: Supports Anthropic-compatible and OpenAI-compatible providers, plus xAI/Grok aliases.
• Workspace aware: Context-aware tools designed to understand your local codebase.
• Session persistence: Resumeable sessions via JSON state management.
• Extensible: Plugin-ready architecture for custom tools and skills.

Getting Started

Prerequisites

1. Install Rust stable and Cargo.
2. Set up your preferred API credentials.

Installation

From the repository root:

cd rust
cargo build --release -p claw-cli

# Install locally to your PATH for global access
cargo install --path crates/claw-cli --locked

Usage

Start the interactive shell:

claw

Run a single prompt:

claw prompt "summarize this workspace"

Resume a previous session:

claw --resume session.json /status

Run claw --help for the full command list, including agents, skills, and system-prompt flows.

Authentication

Configure your environment variables based on your preferred provider:

Anthropic

export ANTHROPIC_API_KEY="..."
export ANTHROPIC_BASE_URL="https://api.anthropic.com"

OpenAI-compatible

export OPENAI_API_KEY="..."
export OPENAI_BASE_URL="https://api.openai.com/v1"

Grok / xAI

export XAI_API_KEY="..."
export XAI_BASE_URL="https://api.x.ai"

You can also authenticate via the CLI:

claw login

Frequently Asked Questions

What is this project? This is an independent, open-source implementation of a terminal-based coding agent, architecturally inspired by Claude Code.

Why Rust? Rust provides the performance, concurrency, and memory safety required for a tool that interacts deeply with local file systems and high-latency LLM APIs.

Can I use local models? Yes, if your local inference server exposes an OpenAI-compatible API and you point the relevant base URL and API key at it.

Is this the official Anthropic Claude Code? No, this is a community-driven open-source project.

Development

We welcome contributions. Please refer to CLAW.md for workspace-specific workflow guidance.

cd rust
cargo fmt
cargo clippy --workspace --all-targets -- -D warnings
cargo test --workspace

Repository Structure

• rust/: Core CLI and runtime implementation.
• src/: Python support code and utilities.
• tests/: Verification suites for agentic behaviors.
• CLAW.md: Internal workflow documentation.

Notes

• This project is an open-source implementation.
• It is not affiliated with or endorsed by Anthropic.