Claude Code 2.1.291

Released Oct 06, 2026 · official source

Safe to upgrade? Many reports – consider waiting

4 bug/regression-labelled issues opened in the 15h after release (4 regression-flagged, 1 mention v2.1.291 in title). Normalised score 57.3.

Issues counted

#99968 [BUG] # Cowork (Windows): local scheduled task runs no longer get the local artifact tools (list_artifacts / update_artifact / verify_artifact) since 2026-09-30 (bug, platform:windows, area:cowork, regression, area:routines)
#99934 [BUG] `claude mcp serve`: Bash run_in_background output is unreachable since TaskOutput was removed (2.1.277) (bug, has repro, platform:linux, area:tools, area:mcp, regression)
#99880 [BUG] **Title:** VS Code extension 2.1.291 fails to register commands on WSL - "command 'claude-vscode.sidebar.open' not found" (bug, has repro, area:ide, platform:vscode, regression, platform:wsl)
#99853 [BUG] Linux: PID namespace/procfs mismatch breaks PDF/.ipynb Read and single-file Grep, and can return another file's content (bug, has repro, platform:linux, area:tools, area:security, regression)

Fixed a regression in 2.1.290 where cloud sessions could drop answers to permission prompts
Fixed a regression in 2.1.288 where the last messages of a session could be lost when quitting