Mutate — Development skill for Claude Code
Run the Playbook §4 mutation pass on critical modules — the real anti-performative metric — and kill survivors.
How to install Mutate
Installs to ~/.claude/commands/davalst-tdd-playbook-mutate.md
mkdir -p ~/.claude/commands && curl -fsSL https://raw.githubusercontent.com/davalst/tdd-playbook/HEAD/.claude/commands/mutate.md -o ~/.claude/commands/davalst-tdd-playbook-mutate.md Restart Claude Code, or start a new session, for it to be picked up.
What Mutate does
description: Run the Playbook §4 mutation pass on critical modules — the real anti-performative metric — and kill survivors. argument-hint:
Run a **mutation-testing pass** (Playbook §4) on the CRITICAL modules: $ARGUMENTS
This is the ungameable check that tests actually catch bugs (100% coverage can assert nothing) — within a seam: the score is blind where test and code share the same wrong belief about a caller's contract (§4 "What mutation score
Alternatives in Development
- North Star Metric — Define North Star Metric and input metrics constellation 7.8k ★
- /triage — Quick triage to decide: submit or kill 1.8k ★
- 00 Index — Skill Modules Index 1.1k ★
Full documentation available on GitHub
View Source RepositoryRelated Skills
Bos Define
Phase 2 — turn discovery evidence into an opportunity tree, select one, and define the success metric with a r
Calendar Dates
Calendar every critical date of a real estate transaction
Synthetic Customer Discovery
A Claude skill for honest synthetic customer discovery: grounded personas, anti-collapse interview rules, and
Octobench
Benchmark harness that compares coding agents — not just models — on real, contamination-resistant tasks: 80 f
Clear Rewrite
Rewrite text to pass CLEAR-100. Plain words, human voice, real structure, no filler. Runs the checker in a loo
Cha Gate
Run every gate command and report the real numbers. Green means green — a skip is not a pass.
Related Agents
Gauntlet Hardener
Stage 5 of the agent gauntlet. Merciless mutation testing over the story's diff — flip operators, mutate const
Test Review Gates
Runs the objective test-verification gates (red-green implementation-removal + mutation testing) for ONE shard
Mutation Survivor Triage
Classifies mutmut survivors and produces a per-file action list. Use after uv run mutmut run when survivors 0,
