Skills（SKILL.md）は、AIエージェント（Claude Code、Cursor、Codexなど）に特定の能力を追加するための設定ファイルです。
詳しく見る →Send SMS jobs and check SMS delivery status through the Retarus SMS for Applications REST API. Use when Codex or OpenClaw needs to create SMS jobs, inspect per-recipient delivery results for a Retarus job ID, work from the SMS4A OpenAPI schema, or route requests across the `eu`, `de1`, and `de2` datacenters with the required `eu` status fallback to both German datacenters.