diff --git a/cli.py b/cli.py
index b9b111725..aaed32e15 100644
--- a/cli.py
+++ b/cli.py
@@ -10039,6 +10039,11 @@ def main(
                 ):
                     cli.agent.quiet_mode = True
                     cli.agent.suppress_status_output = True
+                    # Suppress streaming display callbacks so stdout stays
+                    # machine-readable (no styled "Hermes" box, no tool-gen
+                    # status lines).  The response is printed once below.
+                    cli.agent.stream_delta_callback = None
+                    cli.agent.tool_gen_callback = None
                     result = cli.agent.run_conversation(
                         user_message=effective_query,
                         conversation_history=cli.conversation_history,
@@ -10046,7 +10051,8 @@ def main(
                     response = result.get("final_response", "") if isinstance(result, dict) else str(result)
                     if response:
                         print(response)
-                    print(f"\nsession_id: {cli.session_id}")
+                    # Session ID goes to stderr so piped stdout is clean.
+                    print(f"\nsession_id: {cli.session_id}", file=sys.stderr)
                     
                     # Ensure proper exit code for automation wrappers
                     sys.exit(1 if isinstance(result, dict) and result.get("failed") else 0)