allow for MessageContent to track NULL in special cases

crates/brightstaff/src/handlers/function_calling.rs

@@ -649,6 +649,7 @@ impl ArchFunctionHandler {
         for (idx, message) in messages.iter().enumerate() {
             let mut role = message.role.clone();
             let mut content = match &message.content {
+                MessageContent::Null => String::new(),
                 MessageContent::Text(text) => text.clone(),
                 MessageContent::Parts(_) => String::new(),
             };

crates/hermesllm/src/apis/openai.rs

@@ -219,6 +219,7 @@ impl ResponseMessage {
 #[derive(Serialize, Deserialize, Debug, Clone)]
 #[serde(untagged)]
 pub enum MessageContent {
+    Null,
     Text(String),
     Parts(Vec<ContentPart>),
 }
@@ -227,6 +228,7 @@ pub enum MessageContent {
 impl ExtractText for MessageContent {
     fn extract_text(&self) -> String {
         match self {
+            MessageContent::Null => String::new(),
             MessageContent::Text(text) => text.clone(),
             MessageContent::Parts(parts) => parts.extract_text(),
         }
@@ -248,6 +250,7 @@ impl ExtractText for Vec<ContentPart> {
 impl Display for MessageContent {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
+            MessageContent::Null => write!(f, ""),
             MessageContent::Text(text) => write!(f, "{}", text),
             MessageContent::Parts(parts) => {
                 let text_parts: Vec<String> = parts
@@ -624,6 +627,7 @@ impl ProviderRequest for ChatCompletionsRequest {
         self.messages.iter().fold(String::new(), |acc, m| {
             acc + " "
                 + &match &m.content {
+                    MessageContent::Null => String::new(),
                     MessageContent::Text(text) => text.clone(),
                     MessageContent::Parts(parts) => parts
                         .iter()
@@ -640,6 +644,7 @@ impl ProviderRequest for ChatCompletionsRequest {
     fn get_recent_user_message(&self) -> Option<String> {
         self.messages.last().and_then(|msg| {
             match &msg.content {
+                MessageContent::Null => None,
                 MessageContent::Text(text) => Some(text.clone()),
                 MessageContent::Parts(_) => None, // No user message in parts
             }

crates/hermesllm/src/transforms/lib.rs

@@ -188,6 +188,7 @@ pub fn convert_openai_message_to_anthropic_content(
 
     // Handle regular content
     match &message.content {
+        MessageContent::Null => {}
         MessageContent::Text(text) => {
             if !text.is_empty() {
                 blocks.push(MessagesContentBlock::Text {

crates/hermesllm/src/transforms/request/from_openai.rs

@@ -174,10 +174,7 @@ impl TryFrom<ResponsesInputConverter> for Vec<Message> {
 
 impl From<Message> for MessagesSystemPrompt {
     fn from(val: Message) -> Self {
-        let system_text = match val.content {
+        let system_text = val.content.extract_text();
-            MessageContent::Text(text) => text,
-            MessageContent::Parts(parts) => parts.extract_text(),
-        };
         MessagesSystemPrompt::Single(system_text)
     }
 }
@@ -248,6 +245,7 @@ impl TryFrom<Message> for BedrockMessage {
             Role::User => {
                 // Convert user message content to content blocks
                 match message.content {
+                    MessageContent::Null => {}
                     MessageContent::Text(text) => {
                         if !text.is_empty() {
                             content_blocks.push(ContentBlock::Text { text });
@@ -550,10 +548,7 @@ impl TryFrom<ChatCompletionsRequest> for ConverseRequest {
         for message in req.messages {
             match message.role {
                 Role::System => {
-                    let system_text = match message.content {
+                    let system_text = message.content.extract_text();
-                        MessageContent::Text(text) => text,
-                        MessageContent::Parts(parts) => parts.extract_text(),
-                    };
                     system_messages.push(SystemContentBlock::Text { text: system_text });
                 }
                 _ => {

crates/hermesllm/src/transforms/response/to_openai.rs

@@ -209,6 +209,7 @@ impl TryFrom<MessagesResponse> for ChatCompletionsResponse {
 
         // Convert MessageContent to String for response
         let content_string = match content {
+            MessageContent::Null => None,
             MessageContent::Text(text) => Some(text),
             MessageContent::Parts(parts) => {
                 let text = parts.extract_text();