diff --git a/apps/website/content/docs/agent/api/api-docs.json b/apps/website/content/docs/agent/api/api-docs.json
index 39d960c6..61d9f616 100644
--- a/apps/website/content/docs/agent/api/api-docs.json
+++ b/apps/website/content/docs/agent/api/api-docs.json
@@ -331,7 +331,7 @@
       {
         "name": "refresh",
         "signature": "refresh()",
-        "description": "Fetch the latest thread list from the server. Failures are\n logged via `console.error` (not swallowed silently — silent\n catches have masked prod issues in the past).",
+        "description": "Fetch the latest thread list from the server. Failures are\n logged via `console.error` (not swallowed silently — silent\n catches have masked prod issues in the past).\n\n Invocation and resolution are logged at `console.debug` so prod\n inspection can distinguish \"never called\" from \"called but\n resolved empty\" from \"called and threw.\" This was prompted by a\n demo.threadplane.ai cold-load bug where the sidenav stayed empty\n with no visible signal. Tighten the log volume if it becomes\n noisy.",
         "params": []
       },
       {
diff --git a/libs/langgraph/src/lib/threads/threads-adapter.ts b/libs/langgraph/src/lib/threads/threads-adapter.ts
index d96a95f2..6771c91c 100644
--- a/libs/langgraph/src/lib/threads/threads-adapter.ts
+++ b/libs/langgraph/src/lib/threads/threads-adapter.ts
@@ -78,10 +78,19 @@ export class LangGraphThreadsAdapter {
 
   /** Fetch the latest thread list from the server. Failures are
    *  logged via `console.error` (not swallowed silently — silent
-   *  catches have masked prod issues in the past). */
+   *  catches have masked prod issues in the past).
+   *
+   *  Invocation and resolution are logged at `console.debug` so prod
+   *  inspection can distinguish "never called" from "called but
+   *  resolved empty" from "called and threw." This was prompted by a
+   *  demo.threadplane.ai cold-load bug where the sidenav stayed empty
+   *  with no visible signal. Tighten the log volume if it becomes
+   *  noisy. */
   async refresh(): Promise<void> {
+    console.debug('[LangGraphThreadsAdapter.refresh] invoked');
     try {
       const list = await this.client.threads.search({ limit: 50 });
+      console.debug('[LangGraphThreadsAdapter.refresh] resolved', list.length);
       const mapped = list.map((t) => this.toThread(t));
       this._threads.set(
         mapped