One Skills Brain for Codex, Claude, Cursor, and Copilot with Chezmoi

One Skills Brain for Codex, Claude, Cursor, and Copilot with Chezmoi When you use multiple coding agents across multiple machines, the same prompt often behaves differently for a simple reason: your agent skills and MCP wiring drift over time. Typical failure modes: a skill is updated in one tool but not the others MCP servers are configured differently per machine one tool reads user-level config, another reads project-level config, and behavior diverges The initial problem is not just dotfiles sync. It is maintaining one consistent agent behavior contract across Codex, Claude, Cursor, and Copilot despite different config formats and file locations. The solution in this guide is to separate concerns: one canonical skills directory: ~/.agent-skills/skills one canonical MCP intent (shared definitions rendered per tool) one dotfiles manager (chezmoi) to materialize tool-native adapters Why this works: skills stay identical because they live in one place each tool keeps its native schema,