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Model Context Protocol (MCP) servers can use cordon to make authenticated API calls without holding credentials directly.

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Node.js MCP servers

Node.js MCP servers can use cordon transparently by adding the bootstrap loader. In your MCP server config: 
{
  "mcpServers": {
    "my-server": {
      "command": "npx",
      "args": ["-y", "@some/mcp-server"],
      "env": {
        "NODE_OPTIONS": "--import @c6o/cordon/register"
      }
    }
  }
}
The @c6o/cordon/register import sets up undici’s EnvHttpProxyAgent as the global dispatcher, so Node’s fetch respects the HTTPS_PROXY and HTTP_PROXY environment variables.
The @c6o/cordon npm package must be installed in the project or globally for the register import to resolve.

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Python MCP servers

Python MCP servers using requests or httpx respect HTTPS_PROXY and HTTP_PROXY environment variables automatically. No additional configuration is needed — just ensure the env vars are set: 
{
  "mcpServers": {
    "my-python-server": {
      "command": "python",
      "args": ["-m", "my_mcp_server"],
      "env": {
        "HTTPS_PROXY": "http://127.0.0.1:6790",
        "HTTP_PROXY": "http://127.0.0.1:6790"
      }
    }
  }
}

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Other languages

Most HTTP clients in Go, Rust, Ruby, and other languages respect the standard HTTPS_PROXY environment variable. Set it in the MCP server’s environment and ensure the CA certificate is trusted (via cordon trust).