What problem does it solve? Nontrivial engineering work often ships without rigor: abstractions pile up, bugs get patched at the symptom, and long autonomous runs leave no auditable trail. This Skill provides a structured set of named engineering principles plus leaf skills that apply them, so architecture decisions, debugging, refactors, and unattended work follow a disciplined, verifiable process. ## Core Features & Use Cases - Principles Index: 21 named principles (Laziness Protocol, Fix Root Causes, Prove It Works, Boundary Discipline, and more) that guide decisions on refactoring, debugging, type design, concurrency, and verification, with each principle backed by a full leaf skill. - Workflow Skills: Trigger-based playbooks including how (architecture explanation), why (design-rationale investigation across ADRs, git history, and MCP sources), interrogate (multi-model adversarial review), swarm (parallel worker fan-out), blast-radius (change impact analysis), and show-me-your-work (auditable TSV decision logs). - Use Case: Before shipping a contested refactor, run interrogate to have multiple LLM reviewers challenge the diff from independent angles, then synthesize a verdict categorized into act-on, consider, noted, and dismissed findings. ## Quick Start Ask the agent to go into pstack mode and apply rigorous principles to plan and verify your next nontrivial change.