What problem does it solve? Codebases degrade when changes ship with unclear ownership, silent fallbacks, copy-pasted orchestration, and fixes that patch symptoms instead of root causes. This Skill gives an AI agent a binding craft bar so every change lands with clear ownership, typed boundaries, checked defaults, and a durable test. ## Core Features & Use Cases - Design discipline: Enforces small named helpers, typed boundaries, DRY domain facts, and thin logic-free bindings (Python, Wasm, FFI) over Rust-owned domain logic. - No silent fallbacks: Requires missing owners, routes, configs, schemas, or transports to return typed, observable errors instead of guessed defaults or silent retries. - Root-cause fixing with tests: Mandates that every fix lands code plus the nearest durable test, and that causal claims are tested by breaking the cause and watching the effect disappear. - Use Case: When an agent is about to add a compatibility shim or a silent retry to make a failing change pass, this Skill redirects it to fix the invariant at the boundary that owns it and delete the obsoleted code in the same change. ## Quick Start Apply the craft standard to review this diff and reject any silent fallbacks or untested causal claims before it lands.
