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Extending the configuration
Shared definitions are the source of truth. Rebuild after every semantic change.
Add a rule
Create a focused Markdown file in shared/rules/ and add its loading condition to shared/global-instructions.md. Claude rule skills are generated from the rule filenames; Codex loads the referenced rule files directly. Put always-applicable guidance in general.md, which the build embeds for both clients; a new rule file is not automatically embedded.
Add a skill
Create shared/skills/<category>/<skill>/SKILL.md with valid YAML frontmatter and a concise workflow. Reference shared rules instead of repeating persistent standards.
Add an agent
Create shared/agents/<agent>/agent.yml and instructions.md. Keep semantic behavior in these shared files; the build renders the Codex and Claude Code formats.