Host: Codex CLI — This skill was designed for Claude Code and adapted for Codex. Cross-reference commands use installed skill names in Codex rather than /octo:* slash commands. Use the active Codex shell and subagent tools. Do not claim a provider, model, or host subagent is available until the current session exposes it. For host tool equivalents, see skills/blocks/codex-host-adapter.md.

Design Document Lineage

When a design introduces or changes domain terms, load skills/blocks/domain-modeling.md. Record each definition in the existing design lineage artifact with its evidence source, checked time, and scope. A changed definition invalidates dependent decisions. Link and reopen them instead of leaving stale implementation guidance marked current.

Overview

Persist design documents from brainstorming and planning sessions with branch tracking, revision chains, and cross-session discoverability. Design docs are immutable after creation -- new revisions supersede prior versions rather than editing in place.