The session-start hook emitted {"priority", "message"} JSON on all three
of its output paths. Codex CLI validates SessionStart hook output and
fails the hook on that shape ('hook returned invalid session start JSON
output', #465); the documented contract for both Codex and Claude Code is
{"hookSpecificOutput": {"hookEventName": "SessionStart",
"additionalContext": "..."}}
Switch all three paths (meta-skill injection, jq-missing fallback,
meta-skill-missing fallback) to that envelope. Verified each path emits
valid JSON of the new shape: happy path via jq shape assertion, jq-missing
via PATH='' run, meta-skill-missing via a copy outside the repo.
ayobamiseun
abfb0b3200