## Enact vs agentskills.io Spec — Key Differences
*1. Invalid `name` format* - Spec allows only: lowercase letters, numbers, hyphens (`my-skill`) - Enact uses: namespaced names with slashes (`enact/hello-python`)
*2. Non-standard frontmatter fields* - Spec defines: `name`, `description`, `license`, `compatibility`, `metadata`, `allowed-tools` - Enact adds proprietary fields: `version`, `from`, `build`, `command`, `inputSchema`, `outputSchema`
*3. Different philosophy* - *agentskills.io* = Instructions for agents to read and interpret - *Enact* = Executable package manifest with Docker images, typed I/O schemas, and containerized execution
*4. Directory structure* - Spec expects: `scripts/`, `references/`, `assets/` subdirectories - Enact allows: arbitrary files (`main.py`, `requirements.txt`)
*Bottom line:* Enact borrows the SKILL.md filename but extends it into something fundamentally different — a package manager format rather than an agent instruction format. It's not spec-compliant; it's a conceptual fork.