# Braintrust: Major incident: Custom code preprocessors temporarily disabled on Braintrust Cloud

> Major incident: Custom code preprocessors temporarily disabled on Braintrust Cloud. Detected 2026-11-13 by Rewindex: what changed on Braintrust’s status page, with the before/after diff.

Canonical: https://rewindex.com/change/iac127c500afa94
Last updated: 2026-11-13T01:33:02Z

**Summary:** _summary pending_
- Kind: Major incident · Label: major (vendor)
- Changed: 2026-11-13 01:21 UTC · Detected: 2026-11-13 01:33 UTC
- [Source: https://status.braintrust.dev/incidents/01M797XB9ZRP4H9P2AVMWAMNC8](https://status.braintrust.dev/incidents/01M797XB9ZRP4H9P2AVMWAMNC8)
- [Company: Braintrust](https://rewindex.com/company/braintrust.md)
- Versions: before (none: first archived) → after incident\_version:672/01M797XB9ZRP4H9P2AVMWAMNC8@e321c7a9e30d
- Change 1 of 1 for this incident

Incident page (full timeline): [Custom code preprocessors temporarily disabled on Braintrust Cloud](https://rewindex.com/company/braintrust/incidents/01M797XB9ZRP4H9P2AVMWAMNC8.md)
## What changed

**1. Added: Title**

```diff
+ Custom code preprocessors temporarily disabled on Braintrust Cloud
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ identified
```

**4. Added: Start time**

```diff
+ 2026-11-13 01:21 UTC
```

**5. Added: Update** (identified) · 2026-11-13 01:21 UTC

```diff
+ We have temporarily disabled custom code preprocessors across Braintrust Cloud while we work on fixing an ongoing issue with it. This may affect how conversations render in the Thread view, and the output of Topics facets and any scorers that rely on a custom preprocessor. Saved preprocessor code is unchanged and nothing has been deleted. Logging, querying, experiments, and all other functionality are unaffected, and no other regions are impacted. A fix is in progress and we expect to re-enable custom code preprocessors shortly.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-11-13 01:21 UTC | Major incident: Custom code preprocessors temporarily disabled on Braintrust Cloud (this change) | major |

All Braintrust changes: [timeline](https://rewindex.com/company/braintrust/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._

## Cite this

Major incident: Custom code preprocessors temporarily disabled on Braintrust Cloud on Braintrust’s status page, changed 2026-11-13 01:21 UTC (change 1 of 1).

- Canonical URL: https://rewindex.com/change/iac127c500afa94
- Citation: Braintrust, “Major incident: Custom code preprocessors temporarily disabled on Braintrust Cloud” (2026-11-13 01:21 UTC). Archived by Rewindex: https://rewindex.com/change/iac127c500afa94 (CC BY 4.0).
- Markdown link: `[Braintrust: Major incident: Custom code preprocessors temporarily disabled on Braintrust Cloud (2026-11-13)](https://rewindex.com/change/iac127c500afa94)`


---
Canonical: https://rewindex.com/change/iac127c500afa94 · Markdown: https://rewindex.com/change/iac127c500afa94.md · JSON: https://rewindex.com/api/v1/changes/iac127c500afa94 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-13T04:05:30.113Z