diff --git a/src/cli.rs b/src/cli.rs
new file mode 100644
index 0000000..722023f
--- /dev/null
+++ b/src/cli.rs
@@ -0,0 +1,25 @@
+use clap::Parser;
+
+#[derive(Debug, Parser)]
+#[command(name = "onx")]
+#[command(version)]
+#[command(about)]
+pub struct Cli {
+  #[arg(long)]
+  #[arg(short = 'k')]
+  #[arg(env = "ONSPRING_API_KEY")]
+  #[arg(help = "The API key for the Onspring instance")]
+  pub api_key: Option<String>,
+
+  #[arg(long)]
+  #[arg(short = 'u')]
+  #[arg(env = "ONSPRING_BASE_URL")]
+  #[arg(help = "The base URL for the Onspring API")]
+  pub base_url: Option<String>,
+
+  #[arg(long)]
+  #[arg(short = 'p')]
+  #[arg(help = "Pretty-print JSON output")]
+  #[arg(default_value_t = false)]
+  pub pretty: bool,
+}