ksdisch

Mutation Hardener — Security agent for Claude Code

Security community

Dual-mode mutation-testing agent.

How to install Mutation Hardener

Installs to ~/.claude/agents/ksdisch-claude-config-mutation-hardener.md

Terminal

mkdir -p ~/.claude/agents && curl -fsSL https://raw.githubusercontent.com/ksdisch/claude-config/HEAD/agents/mutation-hardener.md -o ~/.claude/agents/ksdisch-claude-config-mutation-hardener.md

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

What Mutation Hardener does

name: mutation-hardener description: Dual-mode mutation-testing agent. `AUDIT` mode runs the mutation tool over a scope and reports surviving mutants graded on bug-hunt's critical/high/medium/low rubric, editing nothing. `HARDEN` mode adds or strengthens tests to kill listed survivors. Implementation files are read-only in both modes — a mutant killable only by changing implementation is reported as a finding about the implementation, never worked around. It is stage 3 of the `gauntlet` rela

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