🧩 Spellbook: Cross-Runtime Skills for AI Agents

The direction here is clear: Spellbook provides a set of cross-runtime "skills" for tools like Claude Code, Codex, and multi-agent workflows. While there are many AI coding assistants available today, they often operate in silos, making it difficult for developers to share custom instructions or automation scripts across different platforms. Spellbook attempts to break down these walls. Written in Python, it allows you to define a skill once—such as a specific code review rule or an automated task—and reuse it across various AI coding tools. This cross-runtime approach lets developers focus on building the actual workflow rather than getting locked into a single AI tool's ecosystem. The interesting part is how it addresses the growing fragmentation of AI coding tools. As managing context and capabilities across different assistants becomes a new friction point, Spellbook is exploring a more standardized mechanism for distributing agent skills.