diff --git a/run_agent.py b/run_agent.py
index b7c8df670068f..ad99cec2468b5 100644
--- a/run_agent.py
+++ b/run_agent.py
@@ -7192,7 +7192,7 @@ class AIAgent:
                         "session, or check auxiliary.compression."
                     )
 
-            return run_compress_context_with_progress_timeout(
+            result = run_compress_context_with_progress_timeout(
                 worker=_run,
                 messages=messages,
                 system_prompt_fallback=_fallback_prompt,
@@ -7200,24 +7200,22 @@ class AIAgent:
                 total_ceiling_seconds=total_ceiling,
                 on_timeout=_on_timeout,
             )
-            self._active_compression_commit_fence = active_fence
+            # compress_context ran on a daemon pool worker thread; the session
+            # id rotation updated hermes_logging._session_context (a
+            # threading.local) on the WORKER thread, not this one. Propagate
+            # the current session_id back so subsequent log lines on this
+            # thread carry the rotated id (#34089).
             try:
-                return compress_context(
-                    self, messages, system_message,
-                    approx_tokens=approx_tokens, task_id=task_id, focus_topic=focus_topic,
-                    force=force,
-                    defer_context_engine_notification=defer_context_engine_notification,
-                    commit_fence=active_fence,
-                )
-            finally:
-                if previous_fence is missing_fence:
-                    vars(self).pop("_active_compression_commit_fence", None)
-                else:
-                    self._active_compression_commit_fence = previous_fence
-                # Restore whatever the caller had, so a compaction never leaks its
-                # tag into the surrounding scope.
-                if token is not None:
-                    reset_conversation_context(token)
+                from hermes_logging import set_session_context
+                set_session_context(self.session_id)
+            except Exception:
+                pass
+            return result
+        finally:
+            # Restore whatever the caller had, so a compaction never leaks its
+            # tag into the surrounding scope.
+            if token is not None:
+                reset_conversation_context(token)
 
     def _set_tool_guardrail_halt(self, decision: ToolGuardrailDecision) -> None:
         """Record the first guardrail decision that should stop this turn."""