Tusk Drift is an API test record/replay system that lets you run realistic tests generated from real traffic. This CLI orchestrates local and CI test runs, coordinating with a Tusk Drift SDK and Tusk Drift Cloud.

SDKs:

• Node.js
• Python
• ...more to come!

Features

• Replay recorded traces against your service under test
• Deterministic outbound I/O via local mock server
• JSON response comparison with dynamic field rules (UUIDs, timestamps, dates, etc.)
• Tusk Drift Cloud: fetch and replay tests stored with Tusk, and upload test results for intelligent classification of regressions in CI/CD checks

Try it on a demo repo →

Install

Quick install (recommended)

Linux/macOS:

Install the latest version:

curl -fsSL https://cli.usetusk.ai/install.sh | sh

To install a specific version:

curl -fsSL https://cli.usetusk.ai/install.sh | sh -s -- v1.2.3

Linux additional dependencies (for replay sandboxing):

• Debian/Ubuntu: sudo apt install bubblewrap socat
• Fedora/RHEL: sudo dnf install bubblewrap socat
• Arch: sudo pacman -S bubblewrap socat

Without these, sandboxing is disabled and replays run without network isolation. See Architecture - Sandboxing.

Homebrew:

Coming soon.

Windows:

We recommend using WSL for the best experience on Windows. With WSL, you can use the Linux/macOS installation steps above and avoid Windows-specific configuration. For native Windows installation without WSL, expand below to see the steps.

Installation steps

Download the latest release from [GitHub Releases](https://github.com/Use-Tusk/tusk-drift-cli/releases/latest):

1. Download tusk-drift-cli_*_Windows_x86_64.zip (or arm64 for ARM-based Windows)

2. Extract the ZIP file

3. Move tusk.exe to a directory in your PATH (e.g., C:\tools\), or add the extracted directory to your PATH:

   Option A: Add to PATH via PowerShell (run as Administrator):

   [Environment]::SetEnvironmentVariable("Path", $env:Path + ";C:\path\to\tusk", "User")

   Option B: Add to PATH via System Settings:

   • Press Win + R, type sysdm.cpl, press Enter
   • Click "Environment Variables"
   • Under "User variables", select Path and click "Edit"
   • Click "New" and add the folder containing tusk.exe
   • Click OK to save

4. Restart your terminal and verify:

   tusk --version

Note: Windows requires additional configuration for running tests. See Windows Support for details on TCP communication mode setup.

Manual Download

Download pre-built binaries from GitHub Releases.

Build from source

# Go 1.25+
git clone https://github.com/Use-Tusk/tusk-drift-cli.git
cd tusk-drift-cli
make deps
make build

tusk --help

Quick start

Initialize a service:

cd path/to/your/service
tusk init

An onboarding wizard will guide you to create your .tusk/config.yaml config file. You can also create the .tusk directory and config file manually in your root directory of your service. See configuration docs.

You will need to record traces for your service. See your respective SDK's guide for more details. Once you have traces recorded, you can replay them with the tusk run command.

Local traces (default):

# Run all tests from local traces
tusk run

# Or specify source
tusk run --trace-dir .tusk/traces
tusk run --trace-file path/to/trace.jsonl
tusk run --trace-id <traceId>

# Common flags
tusk run --filter '^/api/users' --concurrency 10 --enable-service-logs
tusk run --save-results --results-dir .tusk/results

✨ Tusk Drift Cloud

You can use Tusk Drift as API tests in your CI/CD pipeline by running your test suite against commits in your pull requests. Tusk Drift Cloud offers storage of these tests alongside an additional layer of intelligence on deviations detected:

• Automatic recording of traces based on live traffic in your environment of choice
• Securely store these traces as test suites
• Analyze deviations (classification of intended vs unintended deviations), root cause of deviations against your code changes, and suggested fixes.

We provide an onboarding wizard to help you get started quickly:

tusk cloud-init

For more details, dive into Tusk Drift Cloud docs.

Usage

List traces:

# Local traces
tusk list
tusk list --trace-dir .tusk/traces

# With Tusk Drift Cloud
tusk list --cloud

Interactive TUI (default when attached to a terminal):

tusk run

# Run against Tusk Drift Cloud
tusk run --cloud
tusk run --cloud --trace-test-id <id>           # single test from backend
tusk run --cloud --all-cloud-trace-tests        # run all tests for service

The TUI is best viewed in a window size of at least 150 x 40.

Run headless mode with JSON output for a single test:

tusk run --trace-id <id> --print --output-format=json

How this program uses your .tusk directory:

• Recordings of your app's traffic will be stored in .tusk/traces by default. Specify traces.dir in your .tusk/config.yaml to override.
• If --save-results is provided, results will be stored in .tusk/results by default. Specify results.dir in your .tusk/config.yaml to override.
• If --enable-service-logs or --debug is used, trace replay service logs will be stored in .tusk/logs.

We recommend adding to your .gitignore:

• .tusk/results
• .tusk/logs
• .tusk/traces (if you primarily intend to use Tusk Drift Cloud)

Resources

• Architecture overview
• Configuration
• Troubleshooting

Community

Join our open source community on Slack.

Development

See CONTRIBUTING.md.

License

See LICENSE.