The committed team file at a directory's root (CLAUDE.md, AGENTS.md).
One machine's file beside it (CLAUDE.local.md). NOT Codex's
AGENTS.override.md: the vendor documents that as the directory's
first-priority instruction file, and only its global copy as temporary.
A file under PluginLayout.rulesDir.
A repo-configured alternate name (Codex project_doc_fallback_filenames).
Reached through an @path token in a loaded file, not by location.
What a file IS to the harness that loads it.