From 8bc21c7874da17117b36f906dda35485d91986ef Mon Sep 17 00:00:00 2001
From: Xin Wang <wangx@macmini.com>
Date: Thu, 26 Feb 2026 11:02:15 +0800
Subject: [PATCH] Add detailed logging for session runtime configuration and
 service resolution

---
 engine/core/session.py | 44 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/engine/core/session.py b/engine/core/session.py
index 4f19eba..4f78545 100644
--- a/engine/core/session.py
+++ b/engine/core/session.py
@@ -306,6 +306,29 @@ class Session:
         workflow_runtime = self._bootstrap_workflow(raw_metadata)
         server_runtime = await self._load_server_runtime_metadata(raw_metadata, workflow_runtime)
         client_runtime = self._sanitize_client_metadata(raw_metadata)
+        requested_assistant_id = (
+            workflow_runtime.get("assistantId")
+            or raw_metadata.get("assistantId")
+            or raw_metadata.get("appId")
+            or raw_metadata.get("app_id")
+        )
+        if server_runtime:
+            logger.info(
+                "Session {} loaded trusted runtime config from backend "
+                "(requested_assistant_id={}, resolved_assistant_id={}, configVersionId={}, has_services={})",
+                self.id,
+                requested_assistant_id,
+                server_runtime.get("assistantId"),
+                server_runtime.get("configVersionId") or server_runtime.get("config_version_id"),
+                isinstance(server_runtime.get("services"), dict),
+            )
+        else:
+            logger.warning(
+                "Session {} missing trusted backend runtime config "
+                "(requested_assistant_id={}); falling back to engine defaults + safe client overrides",
+                self.id,
+                requested_assistant_id,
+            )
         metadata = self._merge_runtime_metadata(server_runtime, self._sanitize_untrusted_runtime_metadata(workflow_runtime))
         metadata = self._merge_runtime_metadata(metadata, client_runtime)
 
@@ -314,6 +337,27 @@ class Session:
 
         # Apply runtime service/prompt overrides from backend if provided
         self.pipeline.apply_runtime_overrides(metadata)
+        resolved_preview = self.pipeline.resolved_runtime_config()
+        resolved_services = resolved_preview.get("services", {}) if isinstance(resolved_preview, dict) else {}
+        llm_cfg = resolved_services.get("llm", {}) if isinstance(resolved_services, dict) else {}
+        asr_cfg = resolved_services.get("asr", {}) if isinstance(resolved_services, dict) else {}
+        tts_cfg = resolved_services.get("tts", {}) if isinstance(resolved_services, dict) else {}
+        logger.info(
+            "Session {} effective runtime services "
+            "(assistantId={}, configVersionId={}, output_mode={}, "
+            "llm={}/{}, asr={}/{}, tts={}/{}, tts_enabled={})",
+            self.id,
+            metadata.get("assistantId") or metadata.get("appId") or metadata.get("app_id"),
+            metadata.get("configVersionId") or metadata.get("config_version_id"),
+            (resolved_preview.get("output") or {}).get("mode") if isinstance(resolved_preview, dict) else None,
+            llm_cfg.get("provider"),
+            llm_cfg.get("model"),
+            asr_cfg.get("provider"),
+            asr_cfg.get("model"),
+            tts_cfg.get("provider"),
+            tts_cfg.get("model"),
+            tts_cfg.get("enabled"),
+        )
 
         # Start duplex pipeline
         if not self._pipeline_started: