diff --git a/spel-cli/src/parse.rs b/spel-cli/src/parse.rs
index 705c0f8..e7e89d6 100644
--- a/spel-cli/src/parse.rs
+++ b/spel-cli/src/parse.rs
@@ -98,6 +98,15 @@ fn parse_primitive(raw: &str, prim: &str) -> Result<ParsedValue, String> {
             _ => Err(format!("Invalid bool '{}': expected true/false", raw)),
         },
         "string" | "String" => Ok(ParsedValue::Str(raw.to_string())),
+        // nssa AccountId is SerializeDisplay/DeserializeFromStr: a base58 string on the
+        // wire, not 32 raw bytes. Normalize any input (base58 / 0xhex / Public-prefixed)
+        // to canonical base58 and carry it as a string.
+        "account_id" => {
+            use base58::ToBase58 as _;
+            crate::hex::decode_bytes_32(raw)
+                .map(|b| ParsedValue::Str(b.to_base58()))
+                .map_err(|e| format!("Invalid account_id '{}': {}", raw, e))
+        }
         other => Ok(ParsedValue::Raw(format!("{}({})", other, raw))),
     }
 }
diff --git a/spel-cli/src/serialize.rs b/spel-cli/src/serialize.rs
index 1b40c79..ade1c14 100644
--- a/spel-cli/src/serialize.rs
+++ b/spel-cli/src/serialize.rs
@@ -125,6 +125,8 @@ fn primitive_to_dynamic(prim: &str, val: &ParsedValue) -> Result<DynamicValue, S
         ("program_id", ParsedValue::U32Array(vals)) => Ok(DynamicValue::Tuple(
             vals.iter().map(|v| DynamicValue::U32(*v)).collect(),
         )),
+        // nssa AccountId serializes via Display (base58 string), not as raw bytes.
+        ("account_id", ParsedValue::Str(s)) => Ok(DynamicValue::Str(s.clone())),
         _ => Err(SerializeError::TypeMismatch {
             expected: prim.to_string(),
             got: format!("{:?}", val),