Installation

Recommended: curl installer

The fastest way to install harness:

curl -fsSL https://harness.lol/install.sh | sh

This downloads the latest prebuilt binary for your platform and installs it to ~/.harness/bin/harness. You may need to add ~/.harness/bin to your PATH.

Via crates.io

If you have Rust installed:

cargo install harnesscli

The crate is published as harnesscli but the binary is named harness.

Build from source

git clone https://github.com/ayshptk/harness-cli.git
cd harness
cargo build --release

The binary will be at target/release/harness.

Verify installation

harness --version

Prerequisites

Harness itself has no runtime dependencies, but you need at least one agent CLI installed:

• Claude Code: npm install -g @anthropic-ai/claude-code
• Codex: npm install -g @openai/codex
• OpenCode: curl -fsSL https://opencode.ai/install | bash (or npm i -g opencode-ai@latest)
• Cursor: installed via the Cursor IDE

Check which agents are available:

harness list