diff --git a/session/session.go b/session/session.go
index 10fd0a3..7322412 100644
--- a/session/session.go
+++ b/session/session.go
@@ -147,17 +147,15 @@ func (sess *Session) startEventLog() {
 			sess.AppendLog(FormatEvent(ev))
 
 		case "tool":
-			// Tool events can stream (multiple chunks with same name) or
-			// arrive as a single final result. Write header on first chunk,
-			// then append content. Duplicate final result is suppressed.
+			// Tool events: empty content = header-only (stream start),
+			// non-empty while streaming = chunk, non-empty without streaming = full result.
 			if streamingRole == "tool" {
-				// Continuation of streaming tool output.
-				if ev.Content != "" {
-					sess.AppendLog([]byte(ev.Content))
-				} else {
-					// Empty content = final result marker; streaming is done.
+				if ev.Content == "" {
+					// End of stream.
 					sess.AppendLog([]byte("\n"))
 					streamingRole = ""
+				} else {
+					sess.AppendLog([]byte(ev.Content))
 				}
 				return
 			}
@@ -165,12 +163,14 @@ func (sess *Session) startEventLog() {
 				sess.AppendLog([]byte("\n"))
 				streamingRole = ""
 			}
-			// First tool event — write header and start streaming.
-			sess.AppendLog([]byte("[tool:" + ev.Name + "]\n"))
-			if ev.Content != "" {
-				sess.AppendLog([]byte(ev.Content))
+			if ev.Content == "" {
+				// Stream start: write header, enter streaming mode.
+				sess.AppendLog([]byte("[tool:" + ev.Name + "]\n"))
+				streamingRole = "tool"
+			} else {
+				// Non-streamed tool result (fast tool, no streaming happened).
+				sess.AppendLog(FormatEvent(ev))
 			}
-			streamingRole = "tool"
 
 		case "call":
 			if streamingRole != "" {