Write additional tests to kill surviving mutants identified by Stryker mutation testing. Targets specific uncovered code paths in implementation files that already have passing tests.
$curl -o .claude/agents/test-backfiller.md https://raw.githubusercontent.com/joegaebel/outside-in-tdd-starter/HEAD/.claude/agents/test-backfiller.mdInstalls into the current project.
Install test-backfiller by running `curl -o .claude/agents/test-backfiller.md https://raw.githubusercontent.com/joegaebel/outside-in-tdd-starter/HEAD/.claude/agents/test-backfiller.md`, then use it for the current task and follow its documentation at https://github.com/joegaebel/outside-in-tdd-starter.