diff --git a/AGENTS.md b/AGENTS.md
index 723be8b..3fadb87 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -7,7 +7,7 @@ This repository contains a synchronous Rust utility that fetches product data fr
 2. **Build/Run Order:** The intended command sequence is: `cargo build --release` followed by running the binary (`./target/release/antares_get_data`).
 3. **Development Flow:** Use this order when developing or verifying changes:
     *   `cargo fmt --all -- --check` (Linting)
-    - `cargo check` (Compile/Verify)
+    *   `cargo check` (Compile/Verify) - run after any file modifications
     *   `cargo test` (Testing)
 
 ## 💻 Architecture & Quirks
diff --git a/src/main.rs b/src/main.rs
index 9f0bbe7..80019c6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -11,11 +11,29 @@ use api::make_url;
 use template::antares::Antares;
 use tools::{Logger, export_to_excel};
 
-fn make_request(url: &str) -> Result<String, Box<dyn Error>> {
+fn make_request(url: &str, logger: &Logger) -> Result<String, Box<dyn Error>> {
     let client = Client::builder()
         .timeout(Duration::from_secs(300))
-        .build()?;
-    Ok(client.get(url).send()?.text()?)
+        .build().map_err(|e| {
+            logger.log_error(&format!("Failed to create HTTP client: {}", e));
+            Box::new(std::io::Error::new(std::io::ErrorKind::Other, e.to_string()))
+        })?;
+    
+    let response = client.get(url).send().map_err(|e| {
+        logger.log_error(&format!("HTTP request failed: {}", e));
+        Box::new(std::io::Error::new(std::io::ErrorKind::ConnectionRefused, e.to_string()))
+    })?;
+    
+    if response.status().is_success() {
+        Ok(response.text().map_err(|e| {
+            logger.log_error(&format!("Failed to read response body: {}", e));
+            Box::new(std::io::Error::new(std::io::ErrorKind::Other, e.to_string()))
+        })?)
+    } else {
+        let error_msg = format!("HTTP error: {:?}", response.status());
+        logger.log_error(&error_msg);
+        Err(Box::new(std::io::Error::new(std::io::ErrorKind::ConnectionRefused, error_msg)))
+    }
 }
 
 fn main() -> Result<(), Box<dyn Error>> {
@@ -37,13 +55,12 @@ fn main() -> Result<(), Box<dyn Error>> {
 
     let url = make_url(base, &usercode, &password, cikkszam);
 
-    let response = match make_request(&url) {
+    let response = match make_request(&url, &logger) {
         Ok(resp) => {
             logger.log_info("API request sent successfully");
             resp
         }
         Err(e) => {
-            logger.log_api_failure(&e.to_string());
             return Err(e);
         }
     };
@@ -52,16 +69,34 @@ fn main() -> Result<(), Box<dyn Error>> {
     let items: Antares = match serde_json::from_str::<Antares>(&response) {
         Ok(items) => {
             // Re-serialize via the structs to ensure consistent formatting
-            let pretty = serde_json::to_string_pretty(&items)?;
-            fs::write("antares.json", pretty)?;
+            let pretty = match serde_json::to_string_pretty(&items) {
+                Ok(pretty) => pretty,
+                Err(e) => {
+                    logger.log_error(&format!("Failed to serialize items: {}", e));
+                    return Err(Box::new(e));
+                }
+            };
+            fs::write("antares.json", &pretty).map_err(|e| {
+                logger.log_error(&format!("Failed to write antares.json: {}", e));
+                Box::new(std::io::Error::new(std::io::ErrorKind::Other, e.to_string()))
+            })?;
             logger.log_api_success(items.len());
             items
         }
         Err(_) => {
             // Fall back to pretty-printing raw JSON value, or raw text.
             if let Ok(json_val) = serde_json::from_str::<serde_json::Value>(&response) {
-                let pretty = serde_json::to_string_pretty(&json_val)?;
-                fs::write("antares.json", pretty)?;
+                let pretty = match serde_json::to_string_pretty(&json_val) {
+                    Ok(pretty) => pretty,
+                    Err(e) => {
+                        logger.log_error(&format!("Failed to serialize JSON: {}", e));
+                        return Err(Box::new(e));
+                    }
+                };
+                fs::write("antares.json", &pretty).map_err(|e| {
+                    logger.log_error(&format!("Failed to write antares.json: {}", e));
+                    Box::new(std::io::Error::new(std::io::ErrorKind::Other, e.to_string()))
+                })?;
                 logger.log_info("Response saved as JSON (schema mismatch)");
             } else {
                 fs::write("antares.json", &response)?;
diff --git a/src/tools/logger.rs b/src/tools/logger.rs
index 9dedf92..503d529 100644
--- a/src/tools/logger.rs
+++ b/src/tools/logger.rs
@@ -40,10 +40,6 @@ impl Logger {
         ));
     }
 
-    pub fn log_api_failure(&self, error: &str) {
-        self.log(&format!("✗ API call failed: {}", error));
-    }
-
     pub fn log_export_success(&self, filepath: &str, row_count: usize) {
         self.log(&format!(
             "✓ Export successful - {} rows exported to {}",
@@ -58,4 +54,8 @@ impl Logger {
     pub fn log_info(&self, message: &str) {
         self.log(&format!("ℹ {}", message));
     }
+
+    pub fn log_error(&self, error: &str) {
+        self.log(&format!("✗ Error: {}", error));
+    }
 }