diff --git a/src/cmd_ssh_agent.rs b/src/cmd_ssh_agent.rs
index 1e2cb99..0244e70 100644
--- a/src/cmd_ssh_agent.rs
+++ b/src/cmd_ssh_agent.rs
@@ -37,9 +37,12 @@ impl Session for MySshAgent {
     async fn request_identities(&mut self) -> Result<Vec<Identity>, AgentError> {
         information!("request_identities");
         // let p256_private_key_d = ecdsautil::parse_p256_private_key(&self.private_key_pem).unwrap();
-        let public_key_point = hex::decode("04\
+        let public_key_point = hex::decode(
+            "04\
 f17326c188b9d0cffeddd8ff935f24f2074bbef128ac5b04b9cac05de967df5dbfd065698dce3b8c1f451bb9a1593ace\
-13360bbc49c51f5213777fd873932efa44763bfcc1c764b122a8a8977bcb3e0ad099d652e63db1c5a1bda02120a16dc5").unwrap();
+13360bbc49c51f5213777fd873932efa44763bfcc1c764b122a8a8977bcb3e0ad099d652e63db1c5a1bda02120a16dc5",
+        )
+        .unwrap();
         let identity = Identity {
             pubkey: KeyData::Ecdsa(
                 ssh_key::public::EcdsaPublicKey::from_sec1_bytes(&public_key_point).unwrap(),
@@ -57,14 +60,32 @@ f17326c188b9d0cffeddd8ff935f24f2074bbef128ac5b04b9cac05de967df5dbfd065698dce3b8c
 
         let algorithm = &request.pubkey.algorithm();
         match algorithm {
-            Algorithm::Dsa => {}
             Algorithm::Ecdsa { curve: _ } => {}
             Algorithm::Ed25519 => {}
             Algorithm::Rsa { hash: _ } => {}
-            Algorithm::SkEcdsaSha2NistP256 => {}
-            Algorithm::SkEd25519 => {}
-            Algorithm::Other(_) => {}
-            &_ => {}
+            Algorithm::Dsa => {
+                debugging!("Algorithm::Dsa not supported");
+                return Err(AgentError::Failure);
+            }
+            Algorithm::SkEcdsaSha2NistP256 => {
+                debugging!("Algorithm::SkEcdsaSha2NistP256 not supported");
+                return Err(AgentError::Failure);
+            }
+            Algorithm::SkEd25519 => {
+                debugging!("Algorithm::SkEd25519 not supported");
+                return Err(AgentError::Failure);
+            }
+            Algorithm::Other(algorithm_name) => {
+                debugging!(
+                    "Algorithm::Other not supported, name: {}",
+                    algorithm_name.as_str()
+                );
+                return Err(AgentError::Failure);
+            }
+            &_ => {
+                debugging!("Algorithm::Unknown not supported");
+                return Err(AgentError::Failure);
+            }
         }
 
         let signature = external_command_rs::external_sign(