diff --git a/src/compression_engine.rs b/src/compression_engine.rs
index e8aec59..e183a1f 100755
--- a/src/compression_engine.rs
+++ b/src/compression_engine.rs
@@ -110,6 +110,18 @@ pub trait CompressionEngine {
         true
     }
 
+    /// Checks if this compression engine is internal (built-in) or external (program-based).
+    ///
+    /// Internal engines use Rust implementations without external dependencies.
+    /// External engines rely on system programs.
+    ///
+    /// # Returns
+    ///
+    /// * `bool` - True if internal, false if external.
+    fn is_internal(&self) -> bool {
+        true
+    }
+
     /// Gets status information for this compression engine.
     ///
     /// Provides details about the binary/program used and compression/decompression commands.