From b711cf1ef7a76cc36d38ea5d7bdf8058e0449f09 Mon Sep 17 00:00:00 2001
From: Brian Love <brian@liveloveapp.com>
Date: Wed, 20 May 2026 14:21:27 -0700
Subject: [PATCH] debug(graph): surface _maybe_write_thread_title failures
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The frontend debug PR (#486) confirmed refresh() runs and resolves
with 50 threads on demo.threadplane.ai/embed — so the empty-looking
sidenav is actually 50 rows all labeled "Untitled" because
metadata.title is missing on every prod thread. The Python title
write is failing silently.

Suspected cause: examples/chat/python/src/graph.py:99 falls back to
LANGGRAPH_API_URL='http://localhost:2024' when the env var is unset
inside the LangGraph Platform runtime container — which it almost
certainly is. The get_client() call points at a port that doesn't
exist in the container, threads.update() throws, the bare
`except Exception: return` swallows it.

Replace the bare swallow with a print(..., flush=True) in both
graphs so the next prod run surfaces the actual error in LangGraph
Platform logs. Once we see the error we can fix the URL/auth.

Same anti-pattern, same fix as PR #486 (frontend adapter).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 cockpit/chat/threads/python/src/graph.py | 13 +++++++++++--
 examples/chat/python/src/graph.py        | 13 +++++++++++--
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/cockpit/chat/threads/python/src/graph.py b/cockpit/chat/threads/python/src/graph.py
index 89dd7c8df..02db531e2 100644
--- a/cockpit/chat/threads/python/src/graph.py
+++ b/cockpit/chat/threads/python/src/graph.py
@@ -67,8 +67,17 @@ async def generate_title(state: MessagesState, config) -> dict:
         title = (response.content or "").strip().strip('"').strip("'")[:80]
         if title:
             await client.threads.update(thread_id, metadata={"thread_title": title})
-    except Exception:  # noqa: BLE001 — title is a UX nicety; never block
-        pass
+    except Exception as e:  # noqa: BLE001 — title is a UX nicety; never block
+        # Don't break the run, but DO log. A bare pass has hidden a prod
+        # bug in the sibling examples/chat graph where the title write was
+        # failing silently on every thread (LANGGRAPH_API_URL fallback to
+        # localhost:2024 inside the runtime container). Surface here to
+        # catch the same class of failure early.
+        print(
+            f"[generate_title] failed for thread {thread_id}: "
+            f"{type(e).__name__}: {e}",
+            flush=True,
+        )
     return {}
 
 
diff --git a/examples/chat/python/src/graph.py b/examples/chat/python/src/graph.py
index 699509bac..fe40962c1 100644
--- a/examples/chat/python/src/graph.py
+++ b/examples/chat/python/src/graph.py
@@ -125,8 +125,17 @@ async def _maybe_write_thread_title(state: "State", config: RunnableConfig) -> N
             thread_id,
             metadata={"title": title},
         )
-    except Exception:
-        # Title write must never break the run. Swallow.
+    except Exception as e:  # noqa: BLE001 — title is a UX nicety; never block
+        # Don't break the run, but DO log. A bare swallow has hidden a prod
+        # bug where the title write was failing silently on every thread
+        # (LANGGRAPH_API_URL fallback to localhost:2024 inside the runtime
+        # container). Print to stdout so it surfaces in LangGraph Platform
+        # logs without needing a logger to be configured.
+        print(
+            f"[_maybe_write_thread_title] failed for thread {thread_id}: "
+            f"{type(e).__name__}: {e}",
+            flush=True,
+        )
         return