fix: support an unquoted string in the front matter

.gitignore

@@ -10,4 +10,5 @@ bin
 .idea
 .DS_Store
 .aiignore
-CLAUDE.md
+CLAUDE.md
+syncai.exe

internal/generator/copilot.go

@@ -2,7 +2,6 @@ package generator
 
 import (
 	"sort"
-	"strconv"
 	"strings"
 	"syncai/internal/model"
 )
@@ -12,15 +11,14 @@ type CopilotRulesGenerator struct{}
 func (g CopilotRulesGenerator) GenerateRules(metadata model.RulesMetadata, content []byte) []byte {
 	var sb strings.Builder
 	sb.WriteString("---\n")
-	// Copilot uses applyTo, but also include description for preservation
 	sb.WriteString("description: ")
-	sb.WriteString(strconv.Quote(metadata.Description))
+	sb.WriteString(quoteIfNeeded(metadata.Description))
 	sb.WriteString("\n")
 	sb.WriteString("applyTo: ")
 	if metadata.Globs == "" {
-		sb.WriteString(strconv.Quote("**"))
+		sb.WriteString(quoteIfNeeded("**"))
 	} else {
-		sb.WriteString(strconv.Quote(metadata.Globs))
+		sb.WriteString(quoteIfNeeded(metadata.Globs))
 	}
 	sb.WriteString("\n")
 	if len(metadata.ExtraFields) > 0 {
@@ -35,7 +33,7 @@ func (g CopilotRulesGenerator) GenerateRules(metadata model.RulesMetadata, conte
 		for _, k := range keys {
 			sb.WriteString(k)
 			sb.WriteString(": ")
-			sb.WriteString(strconv.Quote(metadata.ExtraFields[k]))
+			sb.WriteString(quoteIfNeeded(metadata.ExtraFields[k]))
 			sb.WriteString("\n")
 		}
 	}

internal/generator/cursor.go

@@ -3,7 +3,6 @@ package generator
 import (
 	"fmt"
 	"sort"
-	"strconv"
 	"strings"
 	"syncai/internal/model"
 )
@@ -14,7 +13,7 @@ func (g CursorRulesGenerator) GenerateRules(metadata model.RulesMetadata, conten
 	var sb strings.Builder
 	sb.WriteString("---\n")
 	sb.WriteString("description: ")
-	sb.WriteString(strconv.Quote(metadata.Description))
+	sb.WriteString(quoteIfNeeded(metadata.Description))
 	sb.WriteString("\n")
 	sb.WriteString(fmt.Sprintf("alwaysApply: %t\n", metadata.IsAlwaysApply()))
 	sb.WriteString("globs: ")
@@ -33,7 +32,7 @@ func (g CursorRulesGenerator) GenerateRules(metadata model.RulesMetadata, conten
 		for _, k := range keys {
 			sb.WriteString(k)
 			sb.WriteString(": ")
-			sb.WriteString(strconv.Quote(metadata.ExtraFields[k]))
+			sb.WriteString(quoteIfNeeded(metadata.ExtraFields[k]))
 			sb.WriteString("\n")
 		}
 	}

internal/generator/util.go

@@ -1,8 +1,26 @@
 package generator
 
-import "strings"
+import (
+	"strconv"
+	"strings"
+)
+
+const yamlSpecialChars = " \":{}[]#&*!|>'%@`"
 
 func isReservedField(field string) bool {
 	fl := strings.ToLower(field)
 	return fl == "description" || fl == "globs" || fl == "applyto" || fl == "alwaysapply"
 }
+
+func quoteIfNeeded(s string) string {
+	if s == "" {
+		return strconv.Quote(s)
+	}
+	if strings.HasPrefix(s, "\"") && strings.HasSuffix(s, "\"") {
+		return s
+	}
+	if strings.ContainsAny(s, yamlSpecialChars) {
+		return strconv.Quote(s)
+	}
+	return s
+}

internal/util/parser.go

@@ -66,8 +66,9 @@ func ParseFile(path string) (model.Document, error) {
 			}
 
 			if foundEnd && yamlBuf.Len() > 0 {
+				raw := yamlBuf.Bytes()
 				var m map[string]interface{}
-				if err := yaml.Unmarshal(yamlBuf.Bytes(), &m); err == nil {
+				if err := yaml.Unmarshal(raw, &m); err == nil {
 					for k, v := range m {
 						if v == nil {
 							continue
@@ -77,12 +78,37 @@ func ParseFile(path string) (model.Document, error) {
 							if s, ok := cleanYAMLValue(vv); ok {
 								metadata[k] = s
 							}
+						case []interface{}:
+							// join sequence values into comma-separated metadata value
+							var parts []string
+							for _, item := range vv {
+								if s, ok := cleanYAMLValue(item); ok {
+									parts = append(parts, s)
+								}
+							}
+							if len(parts) > 0 {
+								metadata[k] = strings.Join(parts, ",")
+							}
 						default:
 							if s, ok := cleanYAMLValue(v); ok {
 								metadata[k] = s
 							}
 						}
 					}
+				} else {
+					for _, line := range strings.Split(string(raw), "\n") {
+						line = strings.TrimSpace(line)
+						if line == "" {
+							continue
+						}
+						parts := strings.SplitN(line, ":", 2)
+						if len(parts) != 2 {
+							continue
+						}
+						key := strings.TrimSpace(parts[0])
+						val := strings.TrimSpace(parts[1])
+						metadata[key] = val
+					}
 				}
 			} else {
 				// If we didn't find the end delimiter, reset body to full data