NazarKalytiuk/tarn

Overview

A CLI-first API testing tool that uses YAML-defined tests and produces structured JSON output. It is designed for AI-assisted workflows and is written in Rust.

Best for

Best for
Developers needing a lightweight, scriptable API testing tool for AI-driven workflows

Use cases

• Define and run API tests from YAML files
• Integrate test execution into CI/CD pipelines
• Parse structured JSON results for automated analysis

How to use

Install

curl -fsSL https://raw.githubusercontent.com/NazarKalytiuk/tarn/main/install.sh | sh

Tools exposed

• tarn
• tarn-mcp
• tarn-lsp

Tested with

Claude Code, OpenAI Codex, opencode, pi, Cursor, Windsurf

Notes

A CLI-first API testing tool that uses YAML-defined tests and produces structured JSON output. It is designed for AI-assisted workflows and is written in Rust.

3 stars on GitHub. Last updated 2026-06-01. Licensed MIT.

Use cases

• Define and run API tests from YAML files
• Integrate test execution into CI/CD pipelines
• Parse structured JSON results for automated analysis

Pros

• Fast and lightweight due to Rust implementation
• YAML syntax is simple and readable
• JSON output integrates easily with AI and automation tools

Cons

• Small community and limited adoption (only 3 stars)
• May lack features and stability of mature alternatives
• Minimal documentation or ecosystem beyond the repository

Indexed from awesome-mcp-servers-punkpeye and enriched against its public facts.