diff --git a/.codex/config.toml b/.codex/config.toml
new file mode 100644
index 0000000..9d269a1
--- /dev/null
+++ b/.codex/config.toml
@@ -0,0 +1,3 @@
+[mcp_servers.chatwork]
+command = "docker"
+args = ["run", "--rm", "-i", "--env-file", ".env", "chatwork-mcp-server"]
diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..e8163c7
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,8 @@
+node_modules
+dist
+.git
+.github
+.devcontainer
+.env
+.env.test
+npm-debug.log
diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..03cc29b
--- /dev/null
+++ b/.env.example
@@ -0,0 +1 @@
+CHATWORK_API_TOKEN=
diff --git a/.gitignore b/.gitignore
index c98b30e..734ee03 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 node_modules
 dist
 
-.env.test
\ No newline at end of file
+.env
+.env.test
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..7538077
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,18 @@
+FROM node:22-bookworm-slim AS builder
+
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm ci
+
+COPY src ./src
+COPY tsconfig.json ./
+RUN npm run build
+
+FROM node:22-bookworm-slim AS runner
+
+WORKDIR /app
+
+COPY --from=builder /app/dist ./dist
+
+CMD ["node", "dist/index.js"]
diff --git a/README.md b/README.md
index 254e364..cebe247 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 Chatwork を AI から操作するための MCP (Model Context Protocol) サーバーです。
 
+英語版は [README_en.md](README_en.md) を参照してください。
+
 ## 使い方
 
 Claude Desktop を例に説明します。
@@ -28,3 +30,45 @@ Claude Desktop を例に説明します。
 ```
 
 今後、MCP に対応した AI ツールが増える可能性があります。使い方を追加してほしいツールがあった場合、あなたのコントリビュートをお待ちしています！
+
+## Docker + Codex
+
+Docker を使って Codex から利用する場合は、以下の手順でセットアップします。
+
+1. `.env` を作成し、Chatwork API token を設定する
+
+```sh
+cp .env.example .env
+```
+
+`.env` に `CHATWORK_API_TOKEN` を設定してください。
+
+2. Docker イメージをビルドする
+
+```sh
+docker build -t chatwork-mcp-server .
+```
+
+3. プロジェクトローカルの Codex 設定 [`.codex/config.toml`](.codex/config.toml) を使う
+
+```toml
+[mcp_servers.chatwork]
+command = "docker"
+args = ["run", "--rm", "-i", "--env-file", ".env", "chatwork-mcp-server"]
+```
+
+4. このプロジェクトルートで Codex を起動する
+
+```sh
+codex
+```
+
+5. Codex をすでに開いていた場合は、新しいセッションを開始するか再起動する
+
+6. Codex 内で `/mcp` を開き、`chatwork` が表示されることを確認する
+
+補足:
+
+- Codex はこの設定では `.mcp.json` ではなく `.codex/config.toml` を使います
+- `docker run -d ...` で事前に常駐コンテナを起動しておく必要はありません
+- `.env` はプロジェクトルートに置く前提です
diff --git a/README_en.md b/README_en.md
new file mode 100644
index 0000000..d730c87
--- /dev/null
+++ b/README_en.md
@@ -0,0 +1,72 @@
+# Chatwork MCP Server
+
+Chatwork MCP (Model Context Protocol) server for operating Chatwork from AI tools.
+
+## Usage
+
+The following example uses Claude Desktop.
+
+1. Start Claude Desktop
+2. Click "Settings" from the menu
+3. Click the "Developer" tab
+4. Click "Edit Config"
+5. When `claude_desktop_config.json` opens in your editor, update it with the following
+6. Add this configuration
+
+```json
+{
+  "mcpServers": {
+    "chatwork": {
+      "command": "npx",
+      "args": ["@chatwork/mcp-server"],
+      "env": {
+        "CHATWORK_API_TOKEN": "YOUR_CHATWORK_API_TOKEN"
+      }
+    }
+  }
+}
+```
+
+As more AI tools add MCP support, we may add more usage examples here.
+
+## Docker + Codex
+
+To use this server from Codex with Docker, set it up as follows.
+
+1. Create `.env` and set your Chatwork API token
+
+```sh
+cp .env.example .env
+```
+
+Set `CHATWORK_API_TOKEN` in `.env`.
+
+2. Build the Docker image
+
+```sh
+docker build -t chatwork-mcp-server .
+```
+
+3. Use the project-local Codex configuration in [`.codex/config.toml`](.codex/config.toml)
+
+```toml
+[mcp_servers.chatwork]
+command = "docker"
+args = ["run", "--rm", "-i", "--env-file", ".env", "chatwork-mcp-server"]
+```
+
+4. Start Codex from this project root
+
+```sh
+codex
+```
+
+5. If Codex was already open, start a new session or restart it
+
+6. Open `/mcp` in Codex and confirm that `chatwork` is listed
+
+Notes:
+
+- For this setup, Codex uses `.codex/config.toml`, not `.mcp.json`
+- You do not need to start a long-running container with `docker run -d ...` in advance
+- `.env` is expected to exist at the project root
diff --git a/package.json b/package.json
index 3a8f5ea..4b4d263 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,8 @@
     "type-check": "tsc",
     "test": "vitest run",
     "build": "esbuild src/index.ts --minify --bundle --platform=node --format=esm --outfile=dist/index.js",
-    "dev": "npm run build -- --watch"
+    "dev": "npm run build -- --watch",
+    "docker:build": "docker build -t chatwork-mcp-server ."
   },
   "repository": {
     "type": "git",