# BYOK custom model Agent: byok-connect-routed empty interactionUpdate:turnEnded marked success (no assistant/tools) **URL:** \ **Category:** Bug Reports\ **Tags:** byok, chat\ **Created:** [November 11, 2026, 2:46pm UTC](https://forum.cursor.com/t/byok-custom-model-agent-byok-connect-routed-empty-interactionupdate-turnended-marked-success-no-assistant-tools/178102 "2026-11-11T14:46:58Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![lcw](https://avatars.discourse-cdn.com/v4/letter/l/b5e925/32.png) [@lcw](https://forum.cursor.com/u/lcw)\ **Post date:** [November 11, 2026, 2:46pm UTC](https://forum.cursor.com/t/byok-custom-model-agent-byok-connect-routed-empty-interactionupdate-turnended-marked-success-no-assistant-tools/178102/1 "2026-11-11T14:46:58Z")
### Where does the bug appear (feature/product)? Cursor IDE ### Describe the Bug With a custom OpenAI-compatible BYOK model (e.g. lazy/task), Agent Host always selects runtime=connect disposition=fallback reason=byok-connect-routed and logs “Local loop fell back to the backend loop”. On follow-up user messages, the NAL stream often ends in ~6-8s with last\_inbound\_message\_type=interactionUpdate:turnEnded and Turn terminal blob reads count=0. Local transcript shows user → turn\_ended status=success with NO assistant text and NO tool\_use. UI looks idle/“not working” while the turn is marked successful. Distinct from mid-stream drops (Stream ended without turnEnded / PING timed out), which we also saw on the same path. ### Steps to Reproduce 1. Enable OpenAI API Key + Override Base URL (OpenAI-compatible). 2. Open Agent chat; select custom model id lazy/task (or equivalent BYOK custom model). 3. Send a long Agent task that uses many Shell/Read tools. First turn may run tools. 4. After first turn ends, send short follow-ups such as progress / ? / why aren’t you working. 5. Observe: turn completes in ~6-8s with no assistant output; transcript shows empty turn\_ended success. Logs show: Selected Agent Host turn runtime reason=byok-connect-routed; Local loop fell back to the backend loop; last\_inbound\_message\_type=interactionUpdate:turnEnded; Turn terminal blob reads count=0. ### Expected Behavior Either continue the Agent loop with model tokens/tools, OR surface a visible failed/error turn if the backend cannot continue. Do NOT mark an empty turn as success when there is no assistant content and no tools. ### Operating System MacOS ### Version Information Cursor 3.29.15 (stable) / macOS arm64 / glass layout / Pro membership active ### For AI issues: which model did you use? lazy/task (custom OpenAI-compatible BYOK route) ### For AI issues: add Request ID with privacy disabled conversationId 2c949ebf-d437-4046-9640-49f153ad2e27; generationUUIDs: f8f065eb-b776-4f7f-9487-716b1f9b5e13, 40b4377e-a582-4a83-9cac-0c6b32396933, 40d0a01b-a73e-475c-8168-f0878c5cbd87; also 34da7504-7093-4eb7-93be-4ae7c3be6fda / d7d0235d-9c1a-4905-b422-fa543f8106dd ### Additional Information Key log signatures: reason=byok-connect-routed; Local loop fell back to the backend loop; interactionUpdate:turnEnded; Turn terminal blob reads count=0; transcript turn\_ended status=success with zero assistant/tool output. Also observed on same path: Stream ended without turnEnded / PING timed out (transport), but empty-success is the main UX failure. Related forum themes: BYOK early stopping / turn ends before write tool\_use. Ask: empty turnEnded should not be success; or keep Local Loop available for BYOK Agent. ### Does this stop you from using Cursor Sometimes - I can sometimes use Cursor ---
**Author:** ![Colin](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/colin/32/90452_2.png) [@Colin](https://forum.cursor.com/u/Colin)\ **Post date:** [November 11, 2026, 3:23pm UTC](https://forum.cursor.com/t/byok-custom-model-agent-byok-connect-routed-empty-interactionupdate-turnended-marked-success-no-assistant-tools/178102/5 "2026-11-11T15:23:12Z")
Hi @lcw, the empty turns come from what your endpoint returned, not from the routing. On the requests you listed, the response was a 200 stream whose only event was an upstream error object (`402 You're out of credits`, `billing_error`), with no choices and no finish\_reason. Cursor retried once, got the same thing, and ended the turn with nothing to show. ---
**Author:** ![lcw](https://avatars.discourse-cdn.com/v4/letter/l/b5e925/32.png) [@lcw](https://forum.cursor.com/u/lcw)\ **Post date:** [November 12, 2026, 7:31am UTC](https://forum.cursor.com/t/byok-custom-model-agent-byok-connect-routed-empty-interactionupdate-turnended-marked-success-no-assistant-tools/178102/7 "2026-11-12T07:31:15Z")
Thanks Colin — that matches what we can act on. We’ll check the upstream gateway billing/credits for those request IDs. The confusing part on our side was the empty turnEnded/success with no visible 402 in the Agent UI; clearer surfacing of billing\_error would help a lot. We’ll follow up if empty turns continue after credits are restored.