Release v1.2.0 · nekohacker591/LibreChat

LibreChat 1.2.0 - upstream sync (last 48h) + desktop fixes

Failed turns keep their streamed content and render actionable guidance with a retry.
Artifact triggers render as tool rows; downloadable artifacts unify under one card.
The sidebar scrolls as one surface instead of nested scroll containers.
Code approval mode is remembered and stays selectable mid-run.
Ask-user answers survive compaction; queued follow-ups survive handoff.
Files no tool can read get an opt-in text fallback; extracted upload text previews.
Opted-in custom-endpoint media is delivered safely (audio/video encoding).
MCP credentials can renew for schedules; OpenID discovery retries after startup.
Content, tool and agent types split out of the assistants module; @librechat/agents 3.8.7.

The server now runs on Node 26. Node 26 removed buffer.SlowBuffer, and the jsonwebtoken chain reads it at module scope, so the desktop app's own backend died on startup. A first-require shim restores the constructor before that chain loads.
Provider failures are diagnosable. The console transport was dropping the safe failure metadata (status, error code, origin, type); it now renders, and an upstream 5xx shows a retry/attachment hint instead of only the status sentence.
The client build is reproducible again. A fresh install resolved react-vtree's unbounded react-window peer to the v2 major, which removed FixedSizeList/VariableSizeList; react-window is pinned to 1.8.11.