Three-layer defense to keep root SKILL.md (Claude Code) and .agents/skills/oci-deal-accelerator/SKILL.md (Codex) byte-aligned. Without this, Claude Code and Codex can drift and give the user contradictory instructions — exactly the failure mode that produced the workload-driven-mode incident on 2026-04-25. Layers (least → most enforcement): 1. Local pre-commit hook (.githooks/pre-commit, opt-in via ``make install-hooks`` which sets core.hooksPath). When SKILL.md is staged, auto-runs scripts/sync-skill.py and stages the regenerated .agents/ copy in the same commit. Idempotent. 2. ``make install-hooks`` target + a tip line in ``make venv``'s output so any new clone discovers the hook setup. 3. CI gate (.gitea/workflows/skill-sync.yaml) on every push/PR touching SKILL.md or the .agents/ copy. Runs ``scripts/sync-skill.py --check`` and fails the build on drift. Catches anyone who skipped the hook. README documents the rationale and the three layers. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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