lfe-mutation-verifylisted

# LFE Mutation Verify — Prompt-Based Test Quality Reasoning ## Position in Pipeline - **Phase**: 3 (Inspector sub-skill) - **Persona**: Inspector (read-only; no src/ writes) - **Trigger**: Invoked by `/lfe-inspector` Sub-Skill Dispatch when `lfe-mutation-verify: true` in `.docs/quality/inspector-config.md` - **Output**: `.plans/checks/mutation_findings.md` — aggregated by Inspector into `critique.md` ## Mission Reason about test quality by asking: "If we made this change to the production code, would the existing tests catch it?" This is the logical equivalent of a mutation testing tool, done entirely through LLM reasoning over the diff. It surfaces tests that pass for the wrong reason (coincidental correctness) and logic paths that have no discriminating test. This skill is expensive in reasoning tokens. Enable selectively — critical business logic, security-sensitive paths, and mission-critical calculations. ## Hard Rules 0. **Dispatch Context Required (refuse direct invocation)**: This skill is dispatched by `/lfe-inspector` Step 6 — it is not a Brain-typeable skill (per `LLM_AGENT_GUIDE.md` §8.8 Skill Invocation Authority). If invoked without `.plans/builder_done.md` AND `.plans/tdd_report.md` for the current slice, halt immediately and reply: *"`/lfe-mutation-verify` is an Inspector sub-skill dispatched by `/lfe-inspector`. It cannot be run standalone. Run `/lfe-inspector` — the dispatcher will invoke this sub-skill if it is enabled in `.docs/quality/inspector-config