---
title: "stdio MCP 用 env_vars 转发密钥"
filename: "~/.codex/config.toml"
canonical: /templates/mcp-stdio-env-vars/
---

# stdio MCP 用 env_vars 转发密钥

子进程不继承整份 shell。env_vars 转发启动进程里的变量名；env 表只放 PATH 这类字面量。不要写占位符指望展开。

```
[mcp_servers.docs]
command = "npx"
args = ["-y", "@example/docs-mcp"]
env_vars = ["DOCS_API_KEY"]
enabled = true

[mcp_servers.docs.env]
PATH = "/opt/homebrew/bin:/usr/bin:/bin"

```