use newline to find the end of the start tag instead of ">" to avoid issues with the filename containing ">" chars...

Author: sawka

pkg/aiusechat/openai/openai-convertmessage.go

@@ -480,8 +480,8 @@ func (m *OpenAIChatMessage) ConvertToUIMessage() *uctypes.UIMessage {
 			switch block.Type {
 			case "input_text", "output_text":
 				if strings.HasPrefix(block.Text, "<AttachedTextFile_") {
-					openTagEnd := strings.Index(block.Text, ">")
-					if openTagEnd == -1 {
+					openTagEnd := strings.Index(block.Text, "\n")
+					if openTagEnd == -1 || block.Text[openTagEnd-1] != '>' {
 						continue
 					}
 

pkg/aiusechat/usechat.go

@@ -66,7 +66,7 @@ var SystemPromptText_OpenAI = strings.Join([]string{
 	`Be concise and direct. Prefer determinism over speculation. If a brief clarifying question eliminates guesswork, ask it.`,
 
 	// Attached text files
-	`User-attached text files may appear inline as <AttachedTextFile_xxxxxx file_name="...">content</AttachedTextFile_xxxxxx>.`,
+	`User-attached text files may appear inline as <AttachedTextFile_xxxxxx file_name="...">\ncontent\n</AttachedTextFile_xxxxxx>.`,
 	`If multiple attached files exist, treat each as a separate source file with its own file_name.`,
 	`When the user refers to these files, use their inline content directly; do NOT call any read_text_file or file-access tools to re-read them unless asked.`,