I Built Tautest: A Mutation Testing Workflow for AI-Written Tests

Short summary

Tautest is an open-source mutation testing CLI designed for AI-generated code. It identifies weak tests that pass but fail to catch behavior changes, generates AI-ready fix prompts for Claude Code and Cursor, and ships with a GitHub Action for automated PR workflows. By ensuring AI agents write tests that actually fail when behavior mutates—not just tests that pass—it bridges the gap between code generation quality and test quality.

• •Mutation testing identifies AI-written tests that don't protect behavior
• •Generates fix prompts for Claude Code, Cursor, and Codex
• •GitHub Action integration for automated test improvement workflows

Generated with AI, which can make mistakes.