Pattern: 'Write Once, Run on Any Agent' — Skills and Rules Are Becoming Portable Across Harnesses

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Tooling is converging on tool-agnostic configuration: ruler projects one rules file into every agent's format, Cline's CLI bundles Skills so the same SKILL.md runs in Cline and Claude Code, and large installable skill libraries target Claude Code, Cursor, Codex, and Gemini CLI from a single source. The bet is that developers will mix harnesses, so capability and guidance should be authored once and distributed like packages rather than re-implemented per editor.