diff --git a/internal/agent/tools/tools.go b/internal/agent/tools/tools.go
index 88e70008110e23b7f9c6afa125ef6daaa306cb35..41adf7583904ad529a7e93fff9b44cb8aaaf8ffa 100644
--- a/internal/agent/tools/tools.go
+++ b/internal/agent/tools/tools.go
@@ -60,8 +60,8 @@ func GetModelNameFromContext(ctx context.Context) string {
 // markdown description. This extracts just the concise summary line,
 // significantly reducing token usage while preserving essential tool context.
 func FirstLineDescription(content []byte) string {
-	lines := strings.Split(string(content), "\n")
-	for _, line := range lines {
+	lines := strings.SplitSeq(string(content), "\n")
+	for line := range lines {
 		line = strings.TrimSpace(line)
 		if line != "" {
 			return line