From a984e0df3752f6a8883a0e9b6d8efee4abd7f9dd Mon Sep 17 00:00:00 2001
From: VITOHJL <hejl2023@shanghaitech.edu.cn>
Date: Sun, 8 Mar 2026 15:23:55 +0800
Subject: [PATCH] feat(loop): add history message count logging in compression

---
 nanobot/agent/loop.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/nanobot/agent/loop.py b/nanobot/agent/loop.py
index 696e2a7..5d316ea 100644
--- a/nanobot/agent/loop.py
+++ b/nanobot/agent/loop.py
@@ -362,6 +362,7 @@ class AgentLoop:
         if len(chunk) < 2:
             return
 
+        before_msg_count = len(session.messages)
         logger.info(
             "Compression chunk {}: msgs {}-{} (count={}, est~{}, need~{})",
             session.key,
@@ -383,12 +384,13 @@ class AgentLoop:
         self._set_compressed_until(session, end_idx)
         self.sessions.save(session)
 
+        after_msg_count = len(session.messages)
         after_tokens, after_source = self._estimate_session_prompt_tokens(session)
         after_ratio = after_tokens / budget if budget else 0.0
         reduced = max(0, current_tokens - after_tokens)
         reduced_ratio = (reduced / current_tokens) if current_tokens > 0 else 0.0
         logger.info(
-            "Compression done {}: {}/{} ({:.1%}) via {}, reduced={} ({:.1%})",
+            "Compression done {}: {}/{} ({:.1%}) via {}, reduced={} ({:.1%}), history: {} -> {}",
             session.key,
             after_tokens,
             budget,
@@ -396,6 +398,8 @@ class AgentLoop:
             after_source,
             reduced,
             reduced_ratio,
+            before_msg_count,
+            after_msg_count,
         )
 
     def _schedule_background_compression(self, session_key: str) -> None: