docs: guide agents to reuse installed CLI

README.md

@@ -96,12 +96,22 @@ lark-cli calendar +agenda
 
 > The following steps are for AI Agents. Some steps require the user to complete actions in a browser.
 
-**Step 1 — Install**
+**Step 1 — Detect or install**
+
+First check whether `lark-cli` is already available in the current shell. AI Agents should reuse an existing installation instead of asking the user to reinstall every session:
+
+```bash
+command -v lark-cli && lark-cli --version
+```
+
+If the command is missing or cannot run, install it:
 
 ```bash
 npx @larksuite/cli@latest install
 ```
 
+An MCP server is not required for normal `lark-cli` usage. The CLI is a regular terminal command; the bundled Skills teach the Agent when and how to call it.
+
 **Step 2 — Configure app credentials**
 
 > Run this command in the background. It will output an authorization URL — extract it and send it to the user. The command exits automatically after the user completes the setup in the browser.

README.zh.md

@@ -96,12 +96,22 @@ lark-cli calendar +agenda
 
 > 以下步骤面向 AI Agent，部分步骤需要用户在浏览器中配合完成。
 
-**第 1 步 — 安装**
+**第 1 步 — 检测或安装**
+
+先检查当前 shell 是否已经能直接使用 `lark-cli`。AI Agent 应优先复用已有安装，不要每个会话都要求用户重新安装：
+
+```bash
+command -v lark-cli && lark-cli --version
+```
+
+如果命令不存在或无法运行，再执行安装：
 
 ```bash
 npx @larksuite/cli@latest install
 ```
 
+正常使用 `lark-cli` 不需要额外配置 MCP。CLI 是普通终端命令；随包安装的 Skills 会告诉 Agent 何时以及如何调用它。
+
 **第 2 步 — 配置应用凭证**
 
 > 在后台运行此命令，命令会输出一个授权链接，提取该链接并发送给用户，用户在浏览器中完成配置后命令会自动退出。