Resolve dotted config get keys

src/cortex-cli/src/cli/handlers.rs

@@ -836,7 +836,7 @@ pub async fn show_config(config_cli: ConfigCommand) -> Result<()> {
             if config_path.exists() {
                 let content = std::fs::read_to_string(&config_path)?;
                 let config: toml::Value = toml::from_str(&content)?;
-                if let Some(value) = config.get(&args.key) {
+                if let Some(value) = get_config_value(&config, &args.key) {
                     println!("{}", value);
                 } else {
                     bail!("Key '{}' not found in configuration", args.key);
@@ -901,6 +901,19 @@ pub async fn show_config(config_cli: ConfigCommand) -> Result<()> {
     Ok(())
 }
 
+fn get_config_value<'a>(config: &'a toml::Value, key: &str) -> Option<&'a toml::Value> {
+    config.get(key).or_else(|| {
+        let mut current = config;
+        for part in key.split('.') {
+            if part.is_empty() {
+                return None;
+            }
+            current = current.get(part)?;
+        }
+        Some(current)
+    })
+}
+
 /// List features.
 pub async fn list_features() -> Result<()> {
     println!("Feature flags:");

src/cortex-cli/tests/config_get.rs

@@ -0,0 +1,33 @@
+use std::fs;
+use std::process::Command;
+
+use tempfile::tempdir;
+
+#[test]
+fn config_get_resolves_dotted_keys() {
+    let home_dir = tempdir().unwrap();
+    let cortex_home = home_dir.path().join(".cortex");
+    fs::create_dir_all(&cortex_home).unwrap();
+    fs::write(
+        cortex_home.join("config.toml"),
+        r#"[model]
+default = "gpt-4o"
+"#,
+    )
+    .unwrap();
+
+    let output = Command::new(env!("CARGO_BIN_EXE_Cortex"))
+        .args(["config", "get", "model.default"])
+        .env("HOME", home_dir.path())
+        .env_remove("CORTEX_HOME")
+        .output()
+        .unwrap();
+
+    let stdout = String::from_utf8_lossy(&output.stdout);
+    let stderr = String::from_utf8_lossy(&output.stderr);
+    assert!(
+        output.status.success(),
+        "config get failed\nstdout:\n{stdout}\nstderr:\n{stderr}"
+    );
+    assert!(stdout.contains("gpt-4o"), "stdout was {stdout:?}");
+}