cursor-principle-redesign-from-first-principles

Runtime selection

Before runtime-dependent work, read execution selection. In a verified T3 host follow the T3 contract and its method reference; the inline section below is the native Codex branch, not literal T3 dispatch. Outside T3, native Codex follows that inline branch unchanged. If the host is ambiguous or a required capability is unavailable, report the gap; a permission refusal never authorizes switching branches.

Native Codex branch

Redesign From First Principles

When integrating a change, don't bolt it onto the existing design. Redesign as if the requirement had been a foundational assumption from the start.

• Read all affected files and understand the current design
• Ask: "if we were writing this from scratch with this new requirement, what would we build?"
• Propagate the change through every reference: types, docs, examples, rationale sections
• Think about the whole redesign, then deliver it incrementally

This is the method for preserving option value when integrating changes into an existing design.