Improve skill metadata and npx skills docs

README.md

@@ -173,6 +173,9 @@ twitter-cli ships with a [`SKILL.md`](./SKILL.md) so AI agents can execute commo
 #### Claude Code / Antigravity
 
 ```bash
+# Recommended: install the skill directly from GitHub
+npx skills add jackwener/twitter-cli
+
 # Clone into your project's skills directory
 mkdir -p .agents/skills
 git clone git@github.com:jackwener/twitter-cli.git .agents/skills/twitter-cli
@@ -278,6 +281,9 @@ twitter-cli 提供了 [`SKILL.md`](./SKILL.md)，可让 AI Agent 更稳定地调
 #### Claude Code / Antigravity
 
 ```bash
+# 推荐：直接从 GitHub 安装 skill
+npx skills add jackwener/twitter-cli
+
 # 克隆到项目 skills 目录
 mkdir -p .agents/skills
 git clone git@github.com:jackwener/twitter-cli.git .agents/skills/twitter-cli