diff --git a/src/message_types.rs b/src/message_types.rs
index 72e06e9..81f7373 100644
--- a/src/message_types.rs
+++ b/src/message_types.rs
@@ -1,4 +1,3 @@
-
 use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
@@ -17,6 +16,8 @@ impl MessageType {
     pub const SUGGESTION: Self = Self(4);
 
     pub const CONTEXT_CHANGE: Self = Self(5);
+
+    pub const TOOL_EXEC: Self = Self(6);
 }
 
 impl From<i32> for MessageType {
@@ -46,6 +47,7 @@ impl std::fmt::Display for MessageType {
             3 => "CONTINUE",
             4 => "SUGGESTION",
             5 => "CONTEXT_CHANGE",
+            6 => "TOOL_EXEC",
             _ => "UNKNOWN",
         };
         write!(f, "{name}")