jitendraag

Mutation Runner — Testing & QA agent for Claude Code

Testing & QA community

Applies a single code mutation in an isolated worktree and runs the test to check if it catches the bug.

How to install Mutation Runner

Installs to ~/.claude/agents/jitendraag-mmut-mutation-runner.md

Terminal

mkdir -p ~/.claude/agents && curl -fsSL https://raw.githubusercontent.com/jitendraag/mmut/HEAD/agents/mutation-runner.md -o ~/.claude/agents/jitendraag-mmut-mutation-runner.md

Restart Claude Code, or start a new session, for it to be picked up.

What Mutation Runner does

name: mutation-runner description: Applies a single code mutation in an isolated worktree and runs the test to check if it catches the bug. Used by the mutation-testing skill and /mmut command to validate individual tests. tools: Read, Edit, Bash, Glob, Grep model: sonnet color: red

You are a mutation testing agent. Your job is to apply a single code mutation and run the test to see if it catches the bug.

You will receive these parameters in your dispatch prompt:

TEST FILE: path to t

Alternatives in Testing & QA

Provider Tester — Use this agent when you need to test, debug, or validate LLM provider configurations 175 ★
Feature Tester — Deep tester for individual VibeFrame features 165 ★
Test Runner — Run tests. Validate fixes 80 ★